8L Lathe - Motor Achieves speed, but no torque

Lathe
1

I’ve got a 2023 8L lathe. we have been running the same program for about 2 weeks straight, no issues at all. When motor stalls, we change the insert.

Turning a 1.625" OD steel part, simple grooving operation, cycle is 21 seconds long start to finish.

plunge rate is 0.0003 (3 tenths per rev) with a nice carbide sandvik insert. all in all, going well.

THEN

no torque. on plunge, it stalls immediately. There is simply no torque. I have made a support ticket but have gotten no reply. Not sure if this is a motor or VFD issue.

The motor spins up and holds speed just fine. just practically zero torque. It is not a setup issue. we have changed nothing and have been running for weeks. Have chased down wires looking for something loose, no issues. Did a VFD firmware reset at the advice of Tormach on another issue, did not help (Parameter 10, 121, All, etc.)

Help please. I need to get us back up and running. I am well within warranty period. Just looking for advice. Is this a VFD issue or a motor issue?

2

@JONATHAN_MARTIN Welcome to the Tormach Forums!

Looks like I actually just responded to this case. We should be able to get to the bottom of what you are seeing!

3

Any one have any ideas?

I have submitted logs and videos to tormach at their request. So far, radio silent.

4

For anyone else .coming across this, we will be replacing some components to hopefully find what is causing Jonathan’s communication error.

5

yes tormach surfaced this morning and we’re looking at some component swaps.

6

All -

this was resolved with a logic board swap.