[CAD_CAM_EDM_DRO] Low range gears on Bridgeport Series 1

Group,

I just completed installing a VFD on my Bridgeport series 1 J head. It
runs like a charm. I only have single phase power here so the VFD is the
converter, variable speed and dynamic brake all rolled into one. Well, now
that the new motor runs so nice and quite, I notice a lot of bearing noise in
the backgear assembly. I could go in there and refurbish affected parts but
before I do that, I figured I would ask all how often they use low range now
that the VFD can give superb low RPM performance.

I used a 3 HP TEFC motor and a Yaskawa 3 HP VFD. Since the original motor
on the machine was a 3/4hp, I opted for the 3 HP motor/vfd package to give
good torque at low Rpm's. I don't think the machine itself could handle the
full 3 HP endmilling etc. Removing the backgear parts and storing them in a
box sounds like a reasonable thing to do if the motor can handle low RPM
applications. What have you folks found?

Thanks

Peter
THRD, Inc.


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