very basic cad cam software

[EddyCurrent]

Try making the holes 3.1mm and rout them out. ( might even work with 3.01mm). G.

3mm works fine if using a drill mop

[Clive S]

I agree with Geoff make the holes 3.1mm and do them with the same endmil spiral down. ..Clive

[charlieuk]

i still seam to be having the same problem? i made the holes 3.2mm but it is not till i reduce the cutter to 2.6 that it seams to want to include them? any ideas is there another setting i have got wrong? I have attached the file hopefully it shows the setting. many thanks

[Clive S]

Sorry I can't open a cb file. ..Clive

[EddyCurrent]

i still seam to be having the same problem? i made the holes 3.2mm but it is not till i reduce the cutter to 2.6 that it seams to want to include them? any ideas is there another setting i have got wrong? I have attached the file hopefully it shows the setting. many thanks

Because you need to use a drill operation for the holes.

[Clive S]

Because you need to use a drill operation for the holes.

Ok I have just tried this with Aspire and a 3.01 circle and a 3mm end mill with an inside profile and in simulation it's fine ..Clive

[GEOFFREY]

I have been routing all my holes this way for years. I wonder if Charlie is putting his cutter paths on the circle centre with no offset to the inside of circle? To my mind the problem will be in that direction. G.

[JAZZCNC]

USE A PECK DRILL like Eddy suggested. Can't interpolate 3mm hole with a 3mm cutter simple as that.!