I have a Cobra 42, it has a 21-T control. This is my first NC lathe, but im not altogether new to G-code as we have 6 3axis VMC's.

So the issue is in the operators manual it states says that using a ",C or ,R" command, followed by the desired chamfer or radius respectively, at the end of the first G01 will produce the desired chamfer or radius as long as both moves are in G01.

But i get errors regardless of how carefully i follow all of the criteria in the provided text and sample programs, What am i missing, it tells me there are too many commands and complains if the comma isn't present but if it is present it tells me im using the comma inappropriately.

Yes i can program the chamfer or radius independently but i really like the supposed simplicity of this command, please help me use it.

P.S. I contacted hardinge and received the factory .dat files and all the factory parameters and reloaded them all and re-homed the machine it was all kinds of whacky before i did that and all the problems except this one have disappeared since.

:(

we don't use the commas when programming the corner breaks. also one thing the book neglects to mention is the the corners have to be 90° perpendicular to each other, so you can't break between two XZ moves and another XZ move or an XZ move and a Z move etc. the only break you can do is between a
g1 z(XXXX) and a G1 X(XXXX)

don't really know what other problem you may be running into.

I think there is a prepatory G code that is necessary when using auto corner rounding or chamfering. I'll check my manual...also make sure you don't have a conflict with the TNRC and/or the amout of chamfer or radius exceeds the geometry...in other words, you can't radius more than what the step is.

Make sure the arc or chfr will fit between the two linier moves. Also on our cobra the r or c do not use commas but have to be signed for the direction of cut for example
GO X0
G1 Z0 F.005
G1 X1. C-.05 F.004 (NEXT MOVE IS NEGITIVE SO CHFR IS NEGITIVE)(.05 CHFR ON OUTSIDE CORNER)
Z-.5 R.03 (NEXT MOVE IS POSITIVE SO RAD IS POSITIVE)(.03 RAD ON INSIDE CORNER)
X1.1

Thanks for your input guys,

I'll try each of those ideas and see what works, It's funny even the sample program in the users manual doesn't work WTF?

Thanks,
Mike

You may have a parameter setting or the function not turned on...Hardinge would be your best help with to check that out

I contacted hardinge, They were very helpful and provided all the original parameters and all original data loaded on the machine at delivery, I completely reloaded everything back into the machine.

So AFAIK all the parameters and macros are exactly as shipped, Hardinge doesn't seem to be able to help beyond that, however i may just be talking to the wrong people.

Mike