Re: Surface grinder feed project

Sven,
That does sound simple and promising. I had not really thought of
an air over oil system. I wonder if I could get away with an air
cylinder rated at 250 psi. I don't think it is going to take much
pressure to get it going, but to dynamic break and reverse is a
different story. I would just as soon not see it thump on a column of
oil at each end.
Currently the table is driven by a cog/timing belt with tensioners
at each end. The belt is woven over two rollers with the belt under a
cogged pulley between the two rollers. The manual hand crank is
shafted through to the cogged pulley, driving the belt.
If this is written clearly enough I can see the stepper motor/belt
combination absorbing the pulses from the steps at low speed.
Especially considering the added reduction ratio of stepper motor
pulley to hand crank pulley.
Initial tests for torque requirements on the X-axis hand crank are
approx. 10-15lb at 5". I was having a bit of trouble converting this
to a useable for for sizing a motor, be it stepper or servo.
I could use a little lesson in converting inch/lbs and lb/inches
and the like. So far all of the books I have don't speak on the
subject much.
Thanks for continuing this dialog,

Doug