Re: Bridgeport info

Tommy, that is VERY USEFUL info, thankyou. If you have any more
Bridgeport cnc specs please post. I'm beginning the conversion
of a M head, round ram machine and the questions are coming to
light. I am pondering converting the M head to stepper. The knee
on this one is very hard to lift, besides, I need very little Z
axis movement anyway. Has anyone done an M head? Rich Dean

tommym6@... wrote:

>
> From: tommym6@...
>
> Hi all,
>
> I networked some friends and finally spoke with a guy that is well versed
> on Bridgeport (factory) CNCs.
>
> The Type 1 vertical mill (basic 2000 lb job) used zero backlash ball screws for maximum
> efficiency of motor torque to useful table movement.
>
> The stepper based units used 800 in-oz torque motors at 1:1 belt drive
> to the leadscrew, a bigger motor on the knee. Wow at's big!
>
> The motors are sized mostly for table and load acceleration, not cutting load.
>
> On any machine, if you are cutting curves, the zero backlash and proper
> adjustment of gibs is required. Note you have to order your ballscrews with
> zero backlash nuts... it ain't standard.
>
> I have a lot more technical notes and will have to study them to make more sense.
>
> Tom
>
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