Question 1

Machine will not start, stops suddenly or will not complete a cycle

Accepted Answer

1 · Read the actual stop condition — Emergency stop, guard condition, alarm or process pause is active. — Record the complete alarm, time, axis and operation. Clear the hazard first. A normal stop, emergency reset and fault reset are not interchangeable. 2 · Confirm operating mode and job readiness — Manual mode, an unselected drilling row or an unfinished setup prevents the automatic cycle. — Check the approved job, required drill-head selections and ready status. NDB201: a vertical row with neither A nor B motor selected will not run automatically. 3 · Check external supply indications — Lost supply, insufficient air or servo power not enabled. — Read external gauges and status displays without opening the cabinet. Restore only the approved startup conditions; use the machine nameplate and its own manual. 4 · Escalate failed inputs or motor protection — NDB201 fault table identifies pedal/selector/limit-switch faults, thermal relay trips and loose wiring. — Trained technician only: isolate and diagnose the relevant circuit. Correct the trip cause before the prescribed reset; prove one safe complete cycle before release. Stop operation for repeated trips, unexpected motion or a defective safety device. Never bridge a switch or increase overload settings to keep production running.

Question 2

Holes are out of line, pitch accumulates or the fence is not square

Accepted Answer

1 · Separate pitch error from datum error — Wrong reference edge, a panel not seated against its stops, or different face orientation. — Mark the reference face/edge. Check a flat test panel against the approved drawing; measure from one datum, then compare adjacent hole centres and the full span. 2 · Confirm intended hole spacing and tool map — Wrong hole coordinates, spindle selection or tool assignment. — NDB201 and the cited NCB612 family specify 32 mm spindle centres. Check programmed holes and installed tools; do not assume every requested hole must use every spindle. 3 · Inspect positioning and locks — Debris at the stop, unlocked movable head, loose fence or incorrect 0°/90° head seating. — With energy isolated, clean contact surfaces and check setup locks. NDB201 head rotation and fence/head alignment require the manual procedure and trained personnel. 4 · Distinguish one tool from the whole head — One tool offset is wrong, or the head reference itself is displaced. — NCB612 family: compare the reference tool first, then other tools. A technician checks tool data versus head/workpiece offsets; do not offset every hole to hide mechanical looseness. 5 · Verify before production — An adjustment fixes one position but leaves another inaccurate. — NDB201 §7.2 uses equal-size, equal-length tools at the ends of the spindle box on a flat test piece. Check hole position and depth across the head before releasing the setup. Trained technician only for fence, head, guide or coordinate calibration. A measured error is evidence—not permission to change a factory parameter.

Question 3

CNC X/Y zero drifts or mirrored parts drill on the wrong side

Accepted Answer

1 · Check the coordinate display — Machine, absolute/workpiece and relative coordinates are being confused. — NCB612 family distinguishes G53 machine coordinates from G54 workpiece coordinates. Clearing a relative display does not recalibrate the machine. 2 · Check the actual part transformation — Mirror, rotation, turnover, face or reference corner differs from the physical loading. — Compare the saved drawing, preview and labelled panel. PCDrillCAD treats mirroring, rotation and sheet turnover as separate operations. Do not change G54 merely to manufacture a mirrored part. 3 · Confirm model-specific homing and station selection — Incomplete reference return or a wrong station datum. — NDC011D1: the documented home-all sequence references Y1/Z1 before X/Y2/Z2. Verify the chosen left/right station stop. Have a technician investigate any failed home; never force an axis past an obstruction. 4 · Escalate repeatability failure — Position changes between identical test pieces despite correct job data. — Stop production. A technician checks clamping, reference sensors and mechanical drive integrity before recalibrating. Record whether the error is constant, random, or grows with travel. Do not use a new origin to conceal lost position, a collision or slippage. Do not copy offset signs between left-hand and right-hand machines.

Question 4

Hole depth differs from the drawing or software output

Accepted Answer

1 · Verify the job and panel — Wrong panel thickness, face, through/blind-hole choice or hole depth. — Measure actual thickness and compare the active program, not just the drawing thumbnail. Confirm the correct machining face and hole type. 2 · Check tool seating and effective length — Unequal projection, a loose adapter, worn tool or wrong stored tool length. — NDB201: verify equal tip planes after fitting. CNC: compare physical tools with saved diameter, orientation and length/offset entries; retain the original values before authorised changes. 3 · Check penetration under load — Air availability or feed/dwell prevents a larger drill reaching depth. — The NCB612 manual notes that larger diameters can drill shallower when air is insufficient. Restore specified air delivery and use a qualified process review of feed and dwell; do not exceed rated pressure. 4 · Check what the controller actually holds — NDC drawing data was not downloaded, or a setup action cleared the depth. — Matching NDC software: download validated job data after changing the drawing or drilling pass. Its upper/lower ALL Go Home setup function sets hole depth to zero—recheck job depth before production. 5 · Correct only the demonstrated source — Common reference error, individual tool error or mechanical stroke mismatch. — A trained technician separates head/reference calibration from individual tool compensation. Test a known-depth blind hole before batch release. Tool changes require isolation. Coordinate and stroke changes require trained personnel; do not enter example values from a different machine.

Question 5

Panel shifts, clamp marks appear or pressure falls during drilling

Accepted Answer

1 · Check panel contact and hold-down placement — Wrong stop position, uneven support, debris or a clamp over an unsuitable area. — Isolate before clearing or repositioning. Confirm stable seating, correct thickness and the permitted clamp/press layout for the job. 2 · Read the pressure during the fault — Adequate static pressure but inadequate delivery during simultaneous actuation. — Observe the external gauge from a safe position. NDB201 specifies 0.6–0.8 MPa; the cited NCB612 family specifies 0.6–0.7 MPa. These are separate ranges, not a universal setting. 3 · Check sequence and pneumatic condition — A clamp has not settled before drilling; air leakage, a filter restriction or faulty cylinder may contribute. — Trained technician only: inspect the pressure circuit and approved clamp timing. NDC software includes clamp/press delays specifically to ensure completion before drilling. Never shorten them just to accelerate a cycle. Stop operation if the panel cannot be restrained. Keep hands clear of clamps. Do not lower pressure below the approved range to hide surface denting.

Question 6

Cylinder is slow, one spindle will not extend, or a head stays down

Accepted Answer

1 · Confirm the requested movement — The drill/head is not selected, is blocked by the job, or a sequence condition is not met. — Compare active tool/head selection, alarm text and the current stage of the cycle. Individual drill drops apply to equipped CNC blocks—not every gang drill. 2 · Check air preparation externally — Pressure drop, condensate or insufficient approved pneumatic lubrication. — Read the gauge and bowl condition. Follow the fitted FRL instructions; isolate and release residual pressure before opening a bowl. 3 · Inspect return confirmation — A limit/input does not prove the expected position. — NDB201 lists selector and limit-switch faults for failure to lower/return. A trained technician compares physical position with I/O monitoring; do not force an input ON. 4 · Diagnose valve, flow path or internal mechanism — A sticking valve, restricted flow, leaking seal or mechanical bind needs service confirmation. — Trained technician only: follow the machine pneumatic diagram to locate the fault. Internal repairs, seal replacement and manual valve actuation are not operator recovery steps. Stop operation for a jammed or unsupported head. A technician must secure stored-energy loads before depressurising or disconnecting a line. Do not pry a head up or pull the panel free.

Question 7

Entry sensor, panel detection or through-feed transfer will not complete

Accepted Answer

1 · Check the physical feed area — Dust obscures detection, an off-position panel blocks a sensor, or the discharge area is occupied. — Stop and isolate before cleaning accessible sensor faces and clearing the work zone. Use the approved cleaning method and maintain guards. 2 · Identify the exact missing signal — Start, deceleration, stop or downstream-permission signal is absent. — NCB612 conveyor variants describe separate start/deceleration/stop sensors. Matching NDC software in linked mode waits for downstream permission before unloading. Record I/O status for service; do not bridge the handshake. 3 · Confirm size and transfer setup — The panel or sequence is outside the approved setup; a timing change can cause two panels to interfere. — Check actual panel dimensions and current standalone/linked configuration. A technician checks sensor alignment and timing against the installed model; do not enable small-panel timing modes as a generic workaround. Never bypass a photoelectric sensor, defeat a transfer handshake, or use production to test an unverified sensor adjustment.

Question 8

Poor hole finish, melamine blowout, sticking bits or repeated breakage

Accepted Answer

1 · Inspect tool condition and direction — Worn/damaged cutting edges, wrong rotation or an unsuitable drill. — With energy isolated, compare the drill with the head rotation and required hole/material. Replace damaged tooling with the approved type; do not run a chipped bit. 2 · Check chuck/adapter and projection — Debris or poor seating causes off-centre cutting; an incorrect length changes penetration. — Clean the permitted contact surfaces and verify secure seating and tool projection using the model procedure. Do not apply one adapter method to all quick-change systems. 3 · Distinguish entrance, exit and depth defects — Excessive feed, incorrect through-hole setup or weak support can contribute to tear-out. — Check the machining face, thickness and tool path. The NDC software manual warns excessive vertical extension speed causes edge chipping. Use an approved test piece to validate the process. 4 · Check chip clearance and load — Dust/chips accumulate or the process overloads the tool. — Restore extraction and clean only after isolation. Have the tooling/process specialist select feed, RPM and any supported drilling cycle for the actual MDF, melamine or solid wood; no universal RPM is prescribed here. 5 · Investigate persistent vibration or binding — Tool damage may be secondary to spindle, bearing or alignment trouble. — Stop production and retain the failed tool and sample panel. A technician checks runout, spindle condition and drive integrity before another trial. Stop operation for a broken bit, smoke, severe vibration or a trapped tool. Isolate before touching tooling; a retained broken shank needs qualified removal, not hammering or drilling in place.

Question 9

Overload, bearing heat, grinding axis or a jammed drill head

Accepted Answer

1 · Stop and preserve evidence — Grinding, abnormal heat/noise, overload or a jam can precede component failure. — Use emergency stop if there is immediate danger. Record the original alarm and axis/head; isolate before approaching. Do not repeatedly reset an overcurrent or thermal trip. 2 · Arrange controlled fault diagnosis — Tooling load, obstruction, failed lubrication, cooling loss or internal wear must be distinguished. — A technician checks the fault history, tool condition, lubrication delivery, mechanical drive and electrical protection. Secure any vertical head before work; verify repair with the prescribed safety checks and test cycle. Trained technician only: electrical tests, belt tension/alignment where fitted, bearing/ball-screw replacement and gearbox work. No generic rebuild procedure is safe across these models.

Question 10

CNC file will not load, barcode finds no job or controller is disconnected

Accepted Answer

1 · Separate connection failure from file failure — PCDrillCAD is not connected to the controller, or is not ready. — Read status first. Have authorised support verify the configured controller address and connection; record CAM/controller versions. A reachable file does not prove controller readiness. 2 · Confirm file type and the correct import route — A supported extension may still contain an incompatible dialect or job structure. — Matching NDC software Open accepts MPR/XML/DXF, while its drawing editor opens XML saved by that editor. PCDrillCAD import requires the correct format selection and source folder. 3 · Compare the scanned ID to the actual file — Wrong label, missing file, path mismatch or altered scanner text. — Compare the displayed scan with the expected part ID; use the documented typed-ID entry to distinguish lookup from scanner faults. NDC 2020 software uses C:/NXDrillQRCode and a supported vendor XML format; do not apply that path to other controllers. 4 · Verify mappings and queue errors — Prefix/suffix filtering changes the ID, or a converted job fails to switch. — Matching NDC software supports scan-ID filtering; an authorised person checks it against one known label. PCDrillCAD: inspect the queued item’s file-switchover error message before reimporting. Back up validated jobs and settings before changes. Do not install arbitrary software, reset the scanner to factory defaults or change controller networking during production.

Question 11

Wrong job runs, holes are missing or the batch repeats unexpectedly

Accepted Answer

1 · Match physical panel to active program — The selected/queued job is not the label on the loaded panel. — Verify part ID, dimensions, face, current job and next-job queue. Hold incorrectly machined panels for inspection. 2 · Check NDC software-to-PLC transfer — New drawing data was parsed on the PC but the PLC still holds the previous values. — For matching NDC software, use Data Download after changing a drawing or drilling pass. Compare active PLC user data with the intended job; recipe storage is separate from active user data. 3 · Check excluded operations and available tools — Front/back/side-hole blocking, disabled tools or incompatible tool data suppress a hole. — PCDrillCAD: inspect technique blocking, operation enable, assigned tool and reason-for-not-processed fields. Correct only the intended job and save authorised tool changes. 4 · Review quantity and conversion state — Queue mode, cycle mode, target quantity or old converted output differs from the intended batch. — PCDrillCAD queue mode repeats a part to its target quantity; cycle mode advances through parts. Check these settings, reconvert the validated drawing if needed, then simulate and inspect the first piece. Stop the job before correcting data. A screen preview is not proof that the controller has received the same program.

Question 12

Alarm remains after reset, software data is lost or a backup must be restored

Accepted Answer

1 · Preserve the original evidence — Resetting erases useful context without removing the cause. — Save current/historical alarms, timestamps, software versions and the job that triggered the problem. Matching NDC software offers alarm-specific possible causes via its help icon. 2 · Use the correct reset after the cause is cleared — Emergency-stop reset and ordinary fault reset have different functions. — Matching NDC software requires its dedicated emergency reset for an emergency-stop alarm; ordinary fault reset cannot clear it. Repeated reset failure requires diagnosis, not bypass. 3 · Confirm backup scope before restoring — A CAM backup is mistaken for a full machine/controller backup. — NCB612 manual explicitly limits PCDrillCAD backup/restore to CAM, not the controller. NDC software maintains separate saved parameter files; preserve current data and let authorised support select the correct version-specific recovery and revalidation. Never use engineering mode to suppress alarms. Do not publish or use service passwords as a troubleshooting shortcut. Restore, firmware, PLC and parameter changes require authorised service.

Question 13

Dowel feed or glue application fails

Accepted Answer

1 · Check dowel selection and program — Mixed dowel sizes or a job that does not request insertion. — Do not mix dowel sizes in the stock feeder. Check the intended hole, dowel number and insertion selection in the validated job. 2 · Check glue outlet and shutdown cleaning — Residue or cured glue obstructs delivery. — Follow the model’s glue-unit cleaning procedure and confirm smooth feed/glue delivery before production. The manual requires glue-tube cleaning before weekends/holidays; do not improvise solvents or copy this procedure to another glue system. Trained personnel only for glue-system cleaning and adjustments. Isolate before reaching into the feeder; contain cleaning discharge and follow the adhesive safety instructions.

Question 14

Periodical maintenance: what is due and when?

Accepted Answer

Daily / each shift · shared inspection — Dust accumulation, damaged tooling or a deteriorating safety condition. — Check guards, safety devices, tooling, visible fasteners, air and extraction before work. Observe abnormal noise/vibration from outside the guarded area. After isolated shutdown, clean the table, drill areas and work zone; record defects. NDB201 · every 200 operating hours — Spindle-box lubrication is overdue. — Its lubrication table specifies gear grease for the spindle box and spindle-box seat at 200 h. Use the approved product/quantity for the actual assembly; do not substitute the NCB612 40 h schedule. NCB612 family v4.1 · weekly / 40 h — Drill box, spindle or air-preparation upkeep is overdue. — Inspect/clean the electric spindle and drill box; check FRL and lubrication pump. Drill-box text specifies 5 cc per grease nipple every 40 h and the specified Isoflex Topas NB52 product—verify the drill-box label before lubrication; never mix lubricants. NCB612 family v4.1 · two weeks / 80 h — Axis lubrication/cleaning is overdue. — The schedule names rails/sliders, ball screw, gear/rack and slide/round-support rails; EP0 is specified for these points. Keep each-shift cleaning as well. Confirm automatic delivery rather than assuming a full reservoir proves lubrication. NCB612 family v4.1 · monthly / 160 h; six-monthly — Cooling, air-float or electrical deterioration. — Monthly/160 h: inspect air-floating platform/blower and electric fans. Monthly cabinet checks and six-monthly electrical-component inspection are for qualified personnel. Never use high-pressure air inside the cabinet. NDC011D1 · daily and before long shutdown — Glue cures in the delivery system or feeder jams. — Inspect/clean glue residue daily. Perform the specified glue-line cleaning before weekends/holidays. Keep dowel sizes separate and check lubricator condition. Do not transfer CNC drill-box grease intervals to this assembly. Isolate and lock out electrical and pneumatic energy before maintenance. Safely release residual pressure and secure movable loads. A stop button is not energy isolation.

Question 15

Preventive maintenance and first-piece release

Accepted Answer

1 · Before each new job or tool change — Wrong setup can damage a whole batch before it is noticed. — Confirm part orientation, tool direction/retention, stops/clamps, job data and tool dimensions. Inspect a first piece for pitch, edge distance, depth and face quality before releasing the batch. 2 · Trend changes instead of waiting for failure — Rising rejects, air consumption, noise or temperature indicates deterioration. — Log repeat alarms, measured errors and abnormal behaviour. Stop for unsafe changes; give service the trend plus the exact model, serial number and software version. 3 · Maintain clean air and effective extraction — Water/dirt in pneumatics or accumulated chips reduces reliability. — Inspect FRL and extraction connections; empty/clean by the approved procedure. Do not introduce oil into an air circuit unless the fitted system calls for it. NCB612 manual requires shutdown/depressurisation before opening its lubricator. 4 · Protect software and idle machinery — Uncontrolled data changes or long idle periods undermine repeatability. — Keep separately identified job/CAM/controller backups under authorised procedures. After extended idle periods follow the model’s relubrication and startup checks; NCB612 guidance calls for lubrication attention when idle more than a week. This is a preventive workflow, not a substitute for a manufacturer service schedule. Log the date, operating hours, work completed, lubricant, technician and next due point.

Question 16

Do and don’t: safe operation and service handover

Accepted Answer

1 · DO identify / DON’T assume — Similar model names hide different heads, controls and ratings. — DO record the full suffix, serial number, controller and manual revision. DON’T treat NDB201 as NDB201C, NDC642 as NDC642A, or current ND-series products as legacy NCB equivalents. 2 · DO isolate / DON’T bypass — Stored electrical/pneumatic energy can create unexpected movement. — DO use the site lockout procedure and verify a safe state before intervention. DON’T bridge an interlock, overload, sensor or emergency stop; don’t force an I/O signal or disable collision protection. 3 · DO validate / DON’T guess settings — Copied pressure, offsets, speeds or grease specifications can cause damage. — DO use the actual manual, nameplate, component label and approved tooling data. DON’T raise pressure, shorten clamp delay, change soft limits or alter factory parameters to suppress a symptom. 4 · DO give service evidence / DON’T erase it — Repeated resets and unrecorded changes make faults harder to diagnose. — Provide alarm screenshot/code, job file and panel dimensions, affected axis/head/tool, air reading, sample measurements, maintenance history and last change. Do not restart solely because an alarm has disappeared. Stop operation if a safety device fails, a tool breaks, a panel moves uncontrollably or an abnormal mechanical/electrical condition appears. Call authorised service before restart.

Multi Boring & CNC Drilling Machines
Generic Troubleshooting

01. Machine will not start, stops suddenly or will not complete a cycle

02. Holes are out of line, pitch accumulates or the fence is not square

03. CNC X/Y zero drifts or mirrored parts drill on the wrong side

04. Hole depth differs from the drawing or software output

05. Panel shifts, clamp marks appear or pressure falls during drilling

06. Cylinder is slow, one spindle will not extend, or a head stays down

07. Entry sensor, panel detection or through-feed transfer will not complete

08. Poor hole finish, melamine blowout, sticking bits or repeated breakage

09. Overload, bearing heat, grinding axis or a jammed drill head

10. CNC file will not load, barcode finds no job or controller is disconnected

11. Wrong job runs, holes are missing or the batch repeats unexpectedly

12. Alarm remains after reset, software data is lost or a backup must be restored

13. Dowel feed or glue application fails

14. Periodical maintenance: what is due and when?

15. Preventive maintenance and first-piece release

16. Do and don’t: safe operation and service handover

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Read the actual stop condition	Emergency stop, guard condition, alarm or process pause is active.	Record the complete alarm, time, axis and operation. Clear the hazard first. A normal stop, emergency reset and fault reset are not interchangeable.
2 · Confirm operating mode and job readiness	Manual mode, an unselected drilling row or an unfinished setup prevents the automatic cycle.	Check the approved job, required drill-head selections and ready status. NDB201: a vertical row with neither A nor B motor selected will not run automatically.
3 · Check external supply indications	Lost supply, insufficient air or servo power not enabled.	Read external gauges and status displays without opening the cabinet. Restore only the approved startup conditions; use the machine nameplate and its own manual.
4 · Escalate failed inputs or motor protection	NDB201 fault table identifies pedal/selector/limit-switch faults, thermal relay trips and loose wiring.	Trained technician only: isolate and diagnose the relevant circuit. Correct the trip cause before the prescribed reset; prove one safe complete cycle before release.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Separate pitch error from datum error	Wrong reference edge, a panel not seated against its stops, or different face orientation.	Mark the reference face/edge. Check a flat test panel against the approved drawing; measure from one datum, then compare adjacent hole centres and the full span.
2 · Confirm intended hole spacing and tool map	Wrong hole coordinates, spindle selection or tool assignment.	NDB201 and the cited NCB612 family specify 32 mm spindle centres. Check programmed holes and installed tools; do not assume every requested hole must use every spindle.
3 · Inspect positioning and locks	Debris at the stop, unlocked movable head, loose fence or incorrect 0°/90° head seating.	With energy isolated, clean contact surfaces and check setup locks. NDB201 head rotation and fence/head alignment require the manual procedure and trained personnel.
4 · Distinguish one tool from the whole head	One tool offset is wrong, or the head reference itself is displaced.	NCB612 family: compare the reference tool first, then other tools. A technician checks tool data versus head/workpiece offsets; do not offset every hole to hide mechanical looseness.
5 · Verify before production	An adjustment fixes one position but leaves another inaccurate.	NDB201 §7.2 uses equal-size, equal-length tools at the ends of the spindle box on a flat test piece. Check hole position and depth across the head before releasing the setup.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Check the coordinate display	Machine, absolute/workpiece and relative coordinates are being confused.	NCB612 family distinguishes G53 machine coordinates from G54 workpiece coordinates. Clearing a relative display does not recalibrate the machine.
2 · Check the actual part transformation	Mirror, rotation, turnover, face or reference corner differs from the physical loading.	Compare the saved drawing, preview and labelled panel. PCDrillCAD treats mirroring, rotation and sheet turnover as separate operations. Do not change G54 merely to manufacture a mirrored part.
3 · Confirm model-specific homing and station selection	Incomplete reference return or a wrong station datum.	NDC011D1: the documented home-all sequence references Y1/Z1 before X/Y2/Z2. Verify the chosen left/right station stop. Have a technician investigate any failed home; never force an axis past an obstruction.
4 · Escalate repeatability failure	Position changes between identical test pieces despite correct job data.	Stop production. A technician checks clamping, reference sensors and mechanical drive integrity before recalibrating. Record whether the error is constant, random, or grows with travel.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Verify the job and panel	Wrong panel thickness, face, through/blind-hole choice or hole depth.	Measure actual thickness and compare the active program, not just the drawing thumbnail. Confirm the correct machining face and hole type.
2 · Check tool seating and effective length	Unequal projection, a loose adapter, worn tool or wrong stored tool length.	NDB201: verify equal tip planes after fitting. CNC: compare physical tools with saved diameter, orientation and length/offset entries; retain the original values before authorised changes.
3 · Check penetration under load	Air availability or feed/dwell prevents a larger drill reaching depth.	The NCB612 manual notes that larger diameters can drill shallower when air is insufficient. Restore specified air delivery and use a qualified process review of feed and dwell; do not exceed rated pressure.
4 · Check what the controller actually holds	NDC drawing data was not downloaded, or a setup action cleared the depth.	Matching NDC software: download validated job data after changing the drawing or drilling pass. Its upper/lower ALL Go Home setup function sets hole depth to zero—recheck job depth before production.
5 · Correct only the demonstrated source	Common reference error, individual tool error or mechanical stroke mismatch.	A trained technician separates head/reference calibration from individual tool compensation. Test a known-depth blind hole before batch release.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Check panel contact and hold-down placement	Wrong stop position, uneven support, debris or a clamp over an unsuitable area.	Isolate before clearing or repositioning. Confirm stable seating, correct thickness and the permitted clamp/press layout for the job.
2 · Read the pressure during the fault	Adequate static pressure but inadequate delivery during simultaneous actuation.	Observe the external gauge from a safe position. NDB201 specifies 0.6–0.8 MPa; the cited NCB612 family specifies 0.6–0.7 MPa. These are separate ranges, not a universal setting.
3 · Check sequence and pneumatic condition	A clamp has not settled before drilling; air leakage, a filter restriction or faulty cylinder may contribute.	Trained technician only: inspect the pressure circuit and approved clamp timing. NDC software includes clamp/press delays specifically to ensure completion before drilling. Never shorten them just to accelerate a cycle.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Confirm the requested movement	The drill/head is not selected, is blocked by the job, or a sequence condition is not met.	Compare active tool/head selection, alarm text and the current stage of the cycle. Individual drill drops apply to equipped CNC blocks—not every gang drill.
2 · Check air preparation externally	Pressure drop, condensate or insufficient approved pneumatic lubrication.	Read the gauge and bowl condition. Follow the fitted FRL instructions; isolate and release residual pressure before opening a bowl.
3 · Inspect return confirmation	A limit/input does not prove the expected position.	NDB201 lists selector and limit-switch faults for failure to lower/return. A trained technician compares physical position with I/O monitoring; do not force an input ON.
4 · Diagnose valve, flow path or internal mechanism	A sticking valve, restricted flow, leaking seal or mechanical bind needs service confirmation.	Trained technician only: follow the machine pneumatic diagram to locate the fault. Internal repairs, seal replacement and manual valve actuation are not operator recovery steps.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Check the physical feed area	Dust obscures detection, an off-position panel blocks a sensor, or the discharge area is occupied.	Stop and isolate before cleaning accessible sensor faces and clearing the work zone. Use the approved cleaning method and maintain guards.
2 · Identify the exact missing signal	Start, deceleration, stop or downstream-permission signal is absent.	NCB612 conveyor variants describe separate start/deceleration/stop sensors. Matching NDC software in linked mode waits for downstream permission before unloading. Record I/O status for service; do not bridge the handshake.
3 · Confirm size and transfer setup	The panel or sequence is outside the approved setup; a timing change can cause two panels to interfere.	Check actual panel dimensions and current standalone/linked configuration. A technician checks sensor alignment and timing against the installed model; do not enable small-panel timing modes as a generic workaround.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Inspect tool condition and direction	Worn/damaged cutting edges, wrong rotation or an unsuitable drill.	With energy isolated, compare the drill with the head rotation and required hole/material. Replace damaged tooling with the approved type; do not run a chipped bit.
2 · Check chuck/adapter and projection	Debris or poor seating causes off-centre cutting; an incorrect length changes penetration.	Clean the permitted contact surfaces and verify secure seating and tool projection using the model procedure. Do not apply one adapter method to all quick-change systems.
3 · Distinguish entrance, exit and depth defects	Excessive feed, incorrect through-hole setup or weak support can contribute to tear-out.	Check the machining face, thickness and tool path. The NDC software manual warns excessive vertical extension speed causes edge chipping. Use an approved test piece to validate the process.
4 · Check chip clearance and load	Dust/chips accumulate or the process overloads the tool.	Restore extraction and clean only after isolation. Have the tooling/process specialist select feed, RPM and any supported drilling cycle for the actual MDF, melamine or solid wood; no universal RPM is prescribed here.
5 · Investigate persistent vibration or binding	Tool damage may be secondary to spindle, bearing or alignment trouble.	Stop production and retain the failed tool and sample panel. A technician checks runout, spindle condition and drive integrity before another trial.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Stop and preserve evidence	Grinding, abnormal heat/noise, overload or a jam can precede component failure.	Use emergency stop if there is immediate danger. Record the original alarm and axis/head; isolate before approaching. Do not repeatedly reset an overcurrent or thermal trip.
2 · Arrange controlled fault diagnosis	Tooling load, obstruction, failed lubrication, cooling loss or internal wear must be distinguished.	A technician checks the fault history, tool condition, lubrication delivery, mechanical drive and electrical protection. Secure any vertical head before work; verify repair with the prescribed safety checks and test cycle.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Separate connection failure from file failure	PCDrillCAD is not connected to the controller, or is not ready.	Read status first. Have authorised support verify the configured controller address and connection; record CAM/controller versions. A reachable file does not prove controller readiness.
2 · Confirm file type and the correct import route	A supported extension may still contain an incompatible dialect or job structure.	Matching NDC software Open accepts MPR/XML/DXF, while its drawing editor opens XML saved by that editor. PCDrillCAD import requires the correct format selection and source folder.
3 · Compare the scanned ID to the actual file	Wrong label, missing file, path mismatch or altered scanner text.	Compare the displayed scan with the expected part ID; use the documented typed-ID entry to distinguish lookup from scanner faults. NDC 2020 software uses C:/NXDrillQRCode and a supported vendor XML format; do not apply that path to other controllers.
4 · Verify mappings and queue errors	Prefix/suffix filtering changes the ID, or a converted job fails to switch.	Matching NDC software supports scan-ID filtering; an authorised person checks it against one known label. PCDrillCAD: inspect the queued item’s file-switchover error message before reimporting.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Match physical panel to active program	The selected/queued job is not the label on the loaded panel.	Verify part ID, dimensions, face, current job and next-job queue. Hold incorrectly machined panels for inspection.
2 · Check NDC software-to-PLC transfer	New drawing data was parsed on the PC but the PLC still holds the previous values.	For matching NDC software, use Data Download after changing a drawing or drilling pass. Compare active PLC user data with the intended job; recipe storage is separate from active user data.
3 · Check excluded operations and available tools	Front/back/side-hole blocking, disabled tools or incompatible tool data suppress a hole.	PCDrillCAD: inspect technique blocking, operation enable, assigned tool and reason-for-not-processed fields. Correct only the intended job and save authorised tool changes.
4 · Review quantity and conversion state	Queue mode, cycle mode, target quantity or old converted output differs from the intended batch.	PCDrillCAD queue mode repeats a part to its target quantity; cycle mode advances through parts. Check these settings, reconvert the validated drawing if needed, then simulate and inspect the first piece.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Preserve the original evidence	Resetting erases useful context without removing the cause.	Save current/historical alarms, timestamps, software versions and the job that triggered the problem. Matching NDC software offers alarm-specific possible causes via its help icon.
2 · Use the correct reset after the cause is cleared	Emergency-stop reset and ordinary fault reset have different functions.	Matching NDC software requires its dedicated emergency reset for an emergency-stop alarm; ordinary fault reset cannot clear it. Repeated reset failure requires diagnosis, not bypass.
3 · Confirm backup scope before restoring	A CAM backup is mistaken for a full machine/controller backup.	NCB612 manual explicitly limits PCDrillCAD backup/restore to CAM, not the controller. NDC software maintains separate saved parameter files; preserve current data and let authorised support select the correct version-specific recovery and revalidation.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Check dowel selection and program	Mixed dowel sizes or a job that does not request insertion.	Do not mix dowel sizes in the stock feeder. Check the intended hole, dowel number and insertion selection in the validated job.
2 · Check glue outlet and shutdown cleaning	Residue or cured glue obstructs delivery.	Follow the model’s glue-unit cleaning procedure and confirm smooth feed/glue delivery before production. The manual requires glue-tube cleaning before weekends/holidays; do not improvise solvents or copy this procedure to another glue system.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
Daily / each shift · shared inspection	Dust accumulation, damaged tooling or a deteriorating safety condition.	Check guards, safety devices, tooling, visible fasteners, air and extraction before work. Observe abnormal noise/vibration from outside the guarded area. After isolated shutdown, clean the table, drill areas and work zone; record defects.
NDB201 · every 200 operating hours	Spindle-box lubrication is overdue.	Its lubrication table specifies gear grease for the spindle box and spindle-box seat at 200 h. Use the approved product/quantity for the actual assembly; do not substitute the NCB612 40 h schedule.
NCB612 family v4.1 · weekly / 40 h	Drill box, spindle or air-preparation upkeep is overdue.	Inspect/clean the electric spindle and drill box; check FRL and lubrication pump. Drill-box text specifies 5 cc per grease nipple every 40 h and the specified Isoflex Topas NB52 product—verify the drill-box label before lubrication; never mix lubricants.
NCB612 family v4.1 · two weeks / 80 h	Axis lubrication/cleaning is overdue.	The schedule names rails/sliders, ball screw, gear/rack and slide/round-support rails; EP0 is specified for these points. Keep each-shift cleaning as well. Confirm automatic delivery rather than assuming a full reservoir proves lubrication.
NCB612 family v4.1 · monthly / 160 h; six-monthly	Cooling, air-float or electrical deterioration.	Monthly/160 h: inspect air-floating platform/blower and electric fans. Monthly cabinet checks and six-monthly electrical-component inspection are for qualified personnel. Never use high-pressure air inside the cabinet.
NDC011D1 · daily and before long shutdown	Glue cures in the delivery system or feeder jams.	Inspect/clean glue residue daily. Perform the specified glue-line cleaning before weekends/holidays. Keep dowel sizes separate and check lubricator condition. Do not transfer CNC drill-box grease intervals to this assembly.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · Before each new job or tool change	Wrong setup can damage a whole batch before it is noticed.	Confirm part orientation, tool direction/retention, stops/clamps, job data and tool dimensions. Inspect a first piece for pitch, edge distance, depth and face quality before releasing the batch.
2 · Trend changes instead of waiting for failure	Rising rejects, air consumption, noise or temperature indicates deterioration.	Log repeat alarms, measured errors and abnormal behaviour. Stop for unsafe changes; give service the trend plus the exact model, serial number and software version.
3 · Maintain clean air and effective extraction	Water/dirt in pneumatics or accumulated chips reduces reliability.	Inspect FRL and extraction connections; empty/clean by the approved procedure. Do not introduce oil into an air circuit unless the fitted system calls for it. NCB612 manual requires shutdown/depressurisation before opening its lubricator.
4 · Protect software and idle machinery	Uncontrolled data changes or long idle periods undermine repeatability.	Keep separately identified job/CAM/controller backups under authorised procedures. After extended idle periods follow the model’s relubrication and startup checks; NCB612 guidance calls for lubrication attention when idle more than a week.

Sequence to Check	Possible Cause / Need	Possible Solution / Action
1 · DO identify / DON’T assume	Similar model names hide different heads, controls and ratings.	DO record the full suffix, serial number, controller and manual revision. DON’T treat NDB201 as NDB201C, NDC642 as NDC642A, or current ND-series products as legacy NCB equivalents.
2 · DO isolate / DON’T bypass	Stored electrical/pneumatic energy can create unexpected movement.	DO use the site lockout procedure and verify a safe state before intervention. DON’T bridge an interlock, overload, sensor or emergency stop; don’t force an I/O signal or disable collision protection.
3 · DO validate / DON’T guess settings	Copied pressure, offsets, speeds or grease specifications can cause damage.	DO use the actual manual, nameplate, component label and approved tooling data. DON’T raise pressure, shorten clamp delay, change soft limits or alter factory parameters to suppress a symptom.
4 · DO give service evidence / DON’T erase it	Repeated resets and unrecorded changes make faults harder to diagnose.	Provide alarm screenshot/code, job file and panel dimensions, affected axis/head/tool, air reading, sample measurements, maintenance history and last change. Do not restart solely because an alarm has disappeared.