Change between Inches and millimeters on your CNC - CNCnutz Episode 245

https://www.cncnutz.com/2020/04/chang...
I received a question the other day about running files in imperial on a metric machine and it seemed like a good topic to cover as it is not the first time i have been asked this. When you first set up your machine you need to choose the unit of measurement that you want to use on your machine. If you live in the USA you will most likely choose imperial and if you live anywhere else you will probably choose metric. Having made the decision are you stuck with your choice or can you change it easily? Fortunately Gcode has some commands built in just for this situation. G20 & G21
So the long and the short of it is that no matter what Native unit of measurement you set up in your machine you can machine any Gcode file given to you in any unit of measure.

Is it advisable? That is a completely different question. While I am not keen to run other peoples Gcode on my machine and any Gcode I make will always be metric I can see where this could be very handy. In these times of makers spaces where a CNC machine is a communal item it is likely that some people will want to work in Metric while others work in imperial. This is where the G20, G21 will shine. Users can design what they want in whatever unit of measure they want and can still machine it on the same machine.
Cheers

Peter



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