[yoshi900]

I am working on a Atrump Mill with OM-D control.

When rigid tapping (M29S300, G84.......), at the bottom of the stroke, the Z axis does not synchonize with the decel/reverse/accel of the spindle.

I see this happening because I am using a tension/compression holder. At the bottom of the stroke, I can see the Z axis stop very fast, the spindle decel, and the tension holder start to pull out. The faster the spindle speed, the further apart the holder pulls out.

I am pretty sure the mill is able to do rigid tapping because I can do peck tapping (i.e. Q0.1) in the G84 tapping command. So the spindle must have an encoder for spindle orientation.

Has anyone ran into this problem? Is there a parameter that needs to be change? Without solving this problem, I can't really tap faster then 500 rpm and I have to use a tension tap holder.

Many thanks in advance.

[sinha_nsit]

You possibly do not have rigid tapping option.
Pecking might be possible (I am not sure) in standard mode also.
Does the spindle automatically start at R-point without M03?

[yoshi900]

No, the spindle doesn't start without a M03. It would just sit there waiting forever (no alarm).

[sinha_nsit]

In rigid mode, M03 is not needed. Even if you specify it, the spindle would stop and restart again at the R-point.
You do not have rigid-tapping option on your machine.

[yoshi900]

with M03 and M29Sxxx in the code, the spindle would stop and start again at the R point. that's why I thought it might have rigid tapping. But they seem to do the same thing with or without M29. I guess it just doesn't do rigid tapping.
Thanks.

[stevo1]

Send me your 900 parameters via PM and I will have a look at what you have.

Sinha,
I to would have suspected that if the spindle stops and starts "in sync" at the R-plane that this is rigid tapping? Any thoughts?

Stevo

[stevo1]

Yoshi,
I sent you a PM.

Stevo