Re: [CAD_CAM_EDM_DRO] re:Re: rE: RE:hand jive

In a message dated 11/04/2000 2:15:31 PM Hawaiian Standard Time,
janders@... writes:

<< Folding handwheels are not exactly cheap, until you look at the cost of
what they can prevent.


Jon

>>

Jon,

On the giant planer (25' long bed) I used to work by, they had cranks and
handwheels that had dog clutchs just like on a bridgeport knee. They had a
collar that kept the handwheel from falling off the shaft. They had cut a
small counterbore on both clutch faces that allowed a compression spring to
be installed on the shaft. Once you grasped the handle/ wheel and pushed it
in, you could turn the axis. Let go and the spring would disengege the handle
so it would be safe. Not a bad idea, easy to implement and it would reuse
existing parts. You may have to modify the nose of the leadscrew/ballscrew
but I recall they had all this stuff mounted on an extension shaft. Was safe
on large power fed machines, guess it would be good on CNC stuff too.

.02 cents

Peter
THRD, Inc.