Light Machine Corp. Benchman XTr (retrofit)

Steve,
Your logic is sound. Do you know what the gear ratios are in your spindle head?
Is it appropriate to get to 5K rpm?
I will see if I can dig up more info on the LD motor.
Don

Sorry, I've been the rounds with Electrocraft and Allen-Bradley/Rockwell to no avail. Electrocraft says they sold the line to Rockwell. Rockwell has no knowledge of this part. I guess I can't help on this one.

I just picked up one of these machines with the 45k ISO10 ATC spindle. I'm watching this thread with a view to eventual conversion - I managed to get one with its PC and controller card so I'm going to start there.

I can't find much information on the spindle, it would be useful to know what I can expect to get out of it at slower speeds. It was rebuilt a couple of years ago, and the rebuilder noted that it was 43800rpm @730Hz. The VFD (EMS/Saftronics/Yaskawa VG5 model CIMR-G5U22P2-1F) installation and quick start guide suggest its max frequency is 400Hz, so that's a little confusing.

I don't have it under power yet, so I can't go and look at the VFD parameters until I run a 220V 20A circuit..

Don, what can you remember about that spindle? What rpm does it start developing max HP?

The spindle has 0 (zero) torque below 15K RPM. It might spin, but not be useful.
We warm the spindle up at 15K. The exact power curve, I do not recall or have data for.
If I recall correctly, I think we had the 45K spindles made by GTI in Manchester, NH.

The VFD we used has upgraded firmware which allowed it to go to 750Hz.
That PC and controller card are valuable, so don't let them disappear.
I have all the technical details for the VFD (Technical manual, Users Manual, and setup parameters), but I do not know how to attach .PDFs to this forum.

OOPS

The 45K spindles were manufactured by Centerline, we had GTI as our local repair shop.

x-Intelitek Engineer wrote: I have all the technical details for the VFD (Technical manual, Users Manual, and setup parameters), but I do not know how to attach .PDFs to this forum.

If instead of clicking on "Quick Reply", you click Actions/Reply (or Quote). There is then an attachements button under the text entry box where files can be attached.