G41 will compensate to the left-hand side of the programmed path from the radius of the tool while, G42 will have the tool move along the right-hand side of the programmed path to compensate for the radius of the tool.

G41 is left compensation and G42 is right compensation. On a CNC machine, it is usually recommended to use climb milling, this needs to be taken into consideration when writing our programs and deciding which direction to apply cutter compensation. When we wish to cancel the compensation, G40 is used to turn it off.

I explain you in simple way G41 code is use for move cnc control tool left of the countering direction. G42 code is opposite than the G41. It can use for move cnc control tool right of the countering direction. I’ve used G42 & G41 in wire edm work.

Cutter Radius Compensation (CRC) is used in a program to allow the operator to alter the path of a cutter. EXAMPLE: After cutting the part with path 1, the operator measured the part and determined that the part was undersized.

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If you do forget to cancel cutter radius compensation, it’s likely that your series of motions will eventually break a cutter compensation rule and generate some kind of alarm. However, if no alarms are generated, you could be in for a nasty surprise.

“Non-modal” codes effect only the lines on which they occur. For example, G4 (dwell) is non-modal. Modal commands are arranged in sets called “modal groups”….Modal Codes.

Function G40 is used to cancel cutter radius compensation initiated by G41 or G42. It should be programmed after the cut using the compensation is completed by moving away from the finished part in a linear (G01) or rapid traverse (G00) move by at least the radius of the tool.

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It lets a manual programmer ignore cutter size when calculating coordinates for the program, it allows the setup person to choose from a range of cutter sizes, and it allows for easy trial machining and workpiece sizing during setup and the subsequent production run.

Cutter radius compensation compensates for the radius of a cutting tool by causing the controller to maintain a constant offset that is perpendicular to the programmed path in a two-dimensional plane. You can use this feature to compensate for the diameter of a cutting tool or the width of a laser.

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Figure 30-10 shows all three radius offset commands: Keeping in mind that the terms climb and conventional refer to milling only and are relative to spindle rotation and the hand of milling cutter. By this definition, the G41 command is applied for climb milling mode, G42 command is applied for conventional milling mode:

Cutter Compensation code used in this program are, G41 Cutter Radius Compensation Left… CNC Milling programming example code with drawing, which shows how G41 Cutter Radius Compensation Left is used in a cnc mill program. CNC Mill Program (G41 Cutter Radius Compensation Left)…

If the programmed cutter path needs to mill with CONVENTIONAL cutting, and it’s a standard right handed tool, it will then be programmed with G42 cutter RIGHT of the programmed path. G41 will select cutter compensation left; that is the tool is moved to the left of the programmed path to compensate for the radius of the tool.

G41 is left compensation and G42 is right compensation. On a CNC machine, it is usually recommended to use climb milling, this needs to be taken into consideration when writing our programs and deciding which direction to apply cutter compensation.