Defiance VTX?

[El Scotthead]

Hey all,

 

I was wondering if anyone else out there is running a Defiance(now extinct) cnc mill. The reason I'm asking is that I'm starting to experience some machine issues with our VTX and was hoping I might be able to tune 'er up a little.

[deeherk]

wish i could help,but we have haas mills..what is the specifics of the issues you are having?

dan

[El Scotthead]

I think the servos are out of tune--they hum when not in use. Also, the y-axis will generally cut about 0.001-0.002 smaller than the x-axis, unless I mill the part at 45 degrees to the axis'. Then finished geometry comes out fine. The y-axis thing is an annoyance that I can work around, but the servos I think need to be addressed.

[Jack Mitchell]

I don’t believe a servo motor can get out of tune. A servo top card can be electrically trimmed via this card but a qualified electronics technician from Mitsubishi, Fanuc, or whoever, really needs to be the one doing this task. I suspect that these conditions that you describe may also be adjusted through parameters as well.

A servo hum can also occur when there is an obstruction around your limits or home position – try peeling off the guarding to ensure absolute cleanliness.

 

Regards, Jack

[Tom Dorgan from American Precision]

If something has gone to ground it will cause all of the issues you described as well. We had a machine we built brand new and had these problems for a year. We had to keep it for in house use because they could not tune the problem out. Turned out a wire was grounding out. Fixed it and sold the machine as used. Still running great a year later.

[El Scotthead]

Hmmm,

 

some good thoughts here. Thanx guys. I'll look into all suggestions.