[ATM] Mirror Grinding Machine
James P Crombie
jamescrombie at jamescrombie.com
Thu Apr 1 07:30:50 JST 2010
I don' know if you can get enough torque out of stepper motors to
drive a machine at speed. My grinder uses a 1/2hp electric motor
running at 1800rpm, and reduced to between 30-60(variable transmission)
Thats a 30-60 times increase in torque from the motor, less 25% for
frictional losses in the drive line. The one spec I could find on motor
torque gave a figure of 12ft/lbs at 50% usage. Multiply that by 20-40
and you have a lot of torque. I don't think it needs all of that and
through most of the grinding process there is not a lot of resistance,
but as you get down to the fine grits ans especially at polishing there
will be increasing torque requirements. I think a stepper motor may be
alright for the overarm but a small AC motor properly geared down would
Mirror Grinder Page
On 31/03/2010 5:47 PM, Shailesh Dalvi wrote:
> Dear All,
> I want to make machine to grind and polish 5" flats and 7" f/4 mirror.
> machine is based on waineo design. I am planning to use two stepper motor, one for
> spindle and other for overarm. Few questions...
> 1) What torque is needed for spindle motor to polish 7" mirror.
> 2) What force is needed to drive overarm?
> 3) Dose the torque and force are directly proportional to area?
> Fight for the top Test spot
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