Re: [CAD_CAM_EDM_DRO] Low range gears on Bridgeport Series 1

Personly I would prefer to cuntinue useing the backgear for not to stress
the drive train and the motor.
Beside: going from 3/4 hp to 3 hp is a preety harsh jump.
Good Luck
Sven Peter

ptengin@... wrote:

> 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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