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That is indeed a DX-32 control. I think that something else is amiss. The codes should have been modal. I am glad that you got it running though.

You said that is was a DX-32...What actual machine is it?

Here is a blurb from the programming manual.

G17, G18, G19 — PLANE SWITCHING
Circular interpolation is effective in the XY, YZ or ZX planes by preparatory codes as follows:
G17 = XY Plane
G18 =...

Here is some notes we had for teaching classes.

XZ plane circular interpolation
G18G2X__Z__I__K__ or G18G3X__Z__I__K__
where X__Z__ is the endpoint of the arc and I__K__ is the absolute XZ arc...

I will look at my documents to see what gives.
I am mobile today and tomorrow, but can look on Wednesday. Remind me.

G17, 18 and 19 is modal. On machine start up, it is in the G17 mode; as well as if you were to reset the program. How about submitting the code for me to look at, if you are still having the issue.

Try Refresh Your Memory.
www.rym.com
Free upgrades and support.

Thank you for saying what I meant to include. People get hung up on "the circle" concept. It confused the heck out of me for a long time. I even did some test cuts and then stamped the part with...

Except for one instance....
Comp left is climb milling.
Comp right is conventional milling.
It does not matter on the direction...cw...ccw.
Pretend that you are machining along a sine wave or...

Try checking into Ez-Turn Express
www.ezcam.com

I do. What's the problem?

Is it certain that the fmdc is the problem? You still haven't given me the symptoms. If you put in too fast motherboard, this will cause problems. This could be a simple fix.
There are sources...

Have you tried the Tnc145.cnc post?

The FMDC is repairable, but it can be costly.
How is the new system being tempermental?
What are the specifics of the motherboard? Speed, etc.

Use the Inmtci.cnc

Are you having problems with the existing control? How about just upgrading some of the componants? Does the machine have a BMDC or a FMDC?