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  • CNC Alarms

    Fanuc Alarm 5453: NOTE: G68 IS CANCELED

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5453: NOTE: G68 IS CANCELED Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description When bit 2 of parameter No. 5400 is set to 1, and a reset does not cancel G68, this alarm is issued at the time of program restart. To release this alarm, press…

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  • CNC Alarms

    Fanuc Alarm 5452: IMPROPER G–CODE (5AXIS MODE)

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5452: IMPROPER G–CODE (5AXIS MODE) Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description A G code that cannot be specified is found. (5–axis mode) This alarm is issued when;1) Three–dimensional cutter compensation (side–face offset and leading– edge offset) is applied during cutter compensation, or cutter compensation…

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  • CNC Alarms

    Fanuc Alarm 5448: CRC:INTERFERENCE TO AVD.

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5448: CRC:INTERFERENCE TO AVD. Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description In the interference check evade function of cutter compensation, a further interference occurs for an already created interference evade vector. Have you faced Fanuc Alarm 5448 CRC:INTERFERENCE TO AVD. on your machine? Share your experience…

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  • CNC Alarms

    Fanuc Alarm 5447: CRC:DANGEROUS AVOIDANCE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5447: CRC:DANGEROUS AVOIDANCE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The interference check evade function of cutter compensation determines that an evade operation will lead to danger. Have you faced Fanuc Alarm 5447 CRC:DANGEROUS AVOIDANCE on your machine? Share your experience or troubleshooting tips in the…

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  • CNC Alarms

    Fanuc Alarm 5446: CRC:NO AVOIDANCE

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5446: CRC:NO AVOIDANCE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description Because there is no interference evade vector, the interference check evade function of cutter compensation cannot evade interference. Have you faced Fanuc Alarm 5446 CRC:NO AVOIDANCE on your machine? Share your experience or troubleshooting tips in…

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  • CNC Alarms

    Fanuc Alarm 5445: CRC:MOTION IN G39

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5445: CRC:MOTION IN G39 Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description Corner circular interpolation (G39) of cutter compensation is not specified alone but is specified with a move command. Have you faced Fanuc Alarm 5445 CRC:MOTION IN G39 on your machine? Share your experience or troubleshooting…

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  • CNC Alarms

    Fanuc Alarm 5440: ILLEGAL DRILLING AXIS SELECTED

    ByCNC Hub Team October 1, 2026

    Fanuc Alarm 5440: ILLEGAL DRILLING AXIS SELECTED Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The drilling axis specified for the drilling canned cycle is incorrect. The G code command block of the canned cycle does not specify the Z point of the drilling axis. When there is…

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  • CNC G-Code Programming Example: Turning & Arc Interpolation (G03)
    Beginner Guides

    CNC G-Code Programming Example: Turning & Arc Interpolation (G03)

    ByCNC Hub Team September 29, 2026

    This program shapes a round metal part using simple steps: G-Code Program O0001 (TAPER AND RADIUS EXAMPLE)G21 G40 G99 – Sets units to metric (millimeters), Cancel tool comp, Sets the feedrate.T0101 – Select Tool 1 and Offset 1.G96 S180 M03 – Constant Surface Speed 180 m/min, Starts the spindle rotating in the clockwise direction.G00 X52.0…

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  • CNC Slot Milling G-Code Programming Example
    Beginner Guides | Tutorials

    CNC Slot Milling G-Code Programming Example for Beginners

    ByCNC Hub Team September 27, 2026September 27, 2026

    Short and standard G-code CNC program example for slot milling (often called pocket milling or slotting with a flat end mill). This example using an 8 mm flat end mill to cut a slot that is 10 mm wide, 50 mm long, and 5 mm deep in a workpiece made of aluminum or steel. M03…

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  • Simple CNC Turning Program (Facing & OD Turning)
    Beginner Guides

    How to Write a Simple CNC Turning Program (Facing & OD Turning)

    ByCNC Hub Team September 26, 2026

    Here is a simple, standard Fanuc-style CNC lathe program for facing and OD (outside diameter) turning. Below is a step-by-step guide and a complete, commented program example for a basic part. Programming Structure Example CNC Turning Program G-Code Reference O0001 (FACE AND TURN PROGRAM)G28 U0 W0 – Sends the machine axes (X and Z) back…

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  • CNC Alarms

    Fanuc Alarm 230: R CODE NOT FOUND

    ByCNC Hub Team September 26, 2026October 1, 2026

    Fanuc Alarm 230: R CODE NOT FOUND Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description The infeed quantity R has not been instructed for the G161 block. Or the R command value is negative. Correct the program. Have you faced Fanuc Alarm 230 R CODE NOT FOUND on your…

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  • CNC Alarms

    Fanuc Alarm 229: CAN NOT KEEP SYNCHRO–STATE

    ByCNC Hub Team September 26, 2026October 1, 2026

    Fanuc Alarm 229: CAN NOT KEEP SYNCHRO–STATE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description T series;This alarm is generated in the following circumstances.;1 When the synchro/mixed state could not be kept due to system overload.;2 The above condition occurred in CMC devices (hardware) and synchro– state could…

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  • CNC Alarms

    Fanuc Alarm 226: ILLEGAL COMMAND IN SYNCHRO– MODE

    ByCNC Hub Team September 26, 2026October 1, 2026

    Fanuc Alarm 226: ILLEGAL COMMAND IN SYNCHRO– MODE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description T series (At two–path);A travel command has been sent to the axis being synchronized in synchronous mode. Modify the program or the parameter. Have you faced Fanuc Alarm 226 ILLEGAL COMMAND IN…

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  • CNC Alarms

    Fanuc Alarm 225: SYNCHRONOUS/MIXED CONTROL ERROR

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 225: SYNCHRONOUS/MIXED CONTROL ERROR Fanuc Control Model: 16i / 18i / 21 , 0i-T / 0i-TD , 30i / 31i – T series Fanuc Alarm Description T series (At two–path);This alarm is generated in the following circumstances. (Searched for during synchronous and mixed control command.;1 When there is a mistake in axis number…

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  • CNC Alarms

    Fanuc Alarm 224: RETURN TO REFERENCE POINT

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 224: RETURN TO REFERENCE POINT Fanuc Control Model: 15 /15i, 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description M series Reference position return has not been performed before the automatic operation starts. Perform reference position return only when bit 0 of parameter 1005 is 0. Have you faced Fanuc…

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  • CNC Alarms

    Fanuc Alarm 222: DNC OP. NOT ALLOWED IN BG.–EDIT

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 222: DNC OP. NOT ALLOWED IN BG.–EDIT Fanuc Control Model: 16 / 18 / 21 (Models A, B, C), 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description M series Input and output are executed at a time in the background edition. Execute a correct operation. Have you faced Fanuc Alarm 222 DNC OP. NOT…

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  • CNC Alarms

    Fanuc Alarm 221: ILLEGAL COMMAND IN SYNCHR–MODE

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 221: ILLEGAL COMMAND IN SYNCHR–MODE Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description T series Polygon machining synchronous operation and axis control or balance cutting are executed at a time. Modify the program. Have you faced Fanuc Alarm 221 ILLEGAL COMMAND IN SYNCHR–MODE on your machine? Share…

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  • CNC Alarms

    Fanuc Alarm 220: ILLEGAL COMMAND IN SYNCHR–MODE

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 220: ILLEGAL COMMAND IN SYNCHR–MODE Fanuc Control Model: Series 0i-T, 16i/18i/21i-T, and 30i/31i/32i-T Fanuc Alarm Description T series In the synchronous operation, movement is commanded by the NC program or PMC axis control interface for the synchronous axis. Have you faced Fanuc Alarm 220 ILLEGAL COMMAND IN SYNCHR–MODE on your machine? Share your experience…

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  • CNC Alarms

    Fanuc Alarm 219: COMMAND G250/G251 INDEPENDENTLY

    ByCNC Hub Team September 26, 2026September 29, 2026

    Fanuc Alarm 219: COMMAND G250/G251 INDEPENDENTLY Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm Description T series G251 and G250 are not independent blocks. Have you faced Fanuc Alarm 219 COMMAND G250/G251 INDEPENDENTLY on your machine? Share your experience or troubleshooting tips in the comments below to help other CNC…

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  • CNC Alarms

    Fanuc Alarm 218: NOT FOUND P/Q COMMAND IN G251 (T series)

    ByCNC Hub Team September 26, 2026September 26, 2026

    Fanuc Alarm 218: NOT FOUND P/Q COMMAND IN G251 (T series) Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series Fanuc Alarm 218 is a Program/Software (P/S) alarm designated specifically for T series (Turning/Lathe) CNC control models. Fanuc Alarm Description T series P or Q is not commanded in the G251 block,…

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