HELP! - HOW WOULD YOU PROG??

[Alpha558]

A little help please, how to program in G code for a simple task.

16mm thick bright mild steel plate held in a vice. 25mm drilled pilot holes at required places. How do I interpolate a 30.00mm bore using a 12mm End Mill with cutter comp applied so I can tweek the tool radius to allow for wear & keep size?

I am struggling with the approach in & out particularly.

I have put the cutter at the hole center (no comp) & moved it straight out to 15mm rad applying G41? & using G03 X Y I J sending it all the way round back to start position of circle. Then trying to cancel comp G40? moving back to circle center giving me an error which I cannot remember. So my attempt is obviously totally wrong. Can anyone give me a correct example? PLEASE!?!?

Regards.

[tmcallister74]

G0 Z2.5
G1. Z-20. F1984.07
G41. D1 Y-6. F3968.14
G3. X9. Y0 I0 J6. F1984.07
I-9. J0 F3968.14
X3. Y6. I-6. J0 F1984.07
G40. Y5.4
G0 Z25.

Give this a go.