Re: [CAD_CAM_EDM_DRO] 300W Mitsubishi AC servo motors and drives

The calculations are
.9(Nm)X141(oz in)X6.28(2pi)X3(ratio)X2.54(thread per in
1/.3937)X.9(efficiency of the ballscrew)16(oz in a lb)=341 lbs of Force. If
you plan to motorize the knee then you will probably have to install
counterbalancing air spring or a higher ratio on the knee sacrificing speed.
At 300 watts that mean the RPM is about 3400 RPM. So your speed on the
XY axis ballscrews2.54 TPI I would be
3400/3x .3936==446 ipm which is too high for a ballscrew . So a higher ratio
of 6 to 1 would probably be better
Dan Mauch
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch

----- Original Message -----
From: "Horace, T.L.Ho" <skyfroghorace@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, November 14, 2006 5:24 AM
Subject: [CAD_CAM_EDM_DRO] 300W Mitsubishi AC servo motors and drives


> Hi I've got my AC servo motors and drives 3 sets, all 300W, but kind of
> regret I should have bought bigger ones. The continuous torque is
> around 0.9 Nm only according to spec. I am wondering if it's enough to
> motorize X and Y axis of my knee-type mill. I will make pulleys with
> ratio around 3:1.
>
> My ball screw dia 36mm lead 10mm. for both X and Y axis. My mill 2hP
> knee-type bridgeport copy. With these motors what best jobs can I do
> with my CNC mill ? will it comfortable to mill 3d shapes on Aluminum
> blanks ?
>
> Any helps would be appreciated.
>
>
>
>
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