On Mon, 21 Feb 2011 09:37:05 -0800, Larry Jaques
wrote:

On Mon, 21 Feb 2011 10:19:00 -0600, "Pete C."
wrote:


Ignoramus17758 wrote:

I am trying to make a dog clutch that mates with the knee crank and
replaces the crank handle:

BTW Iggy, that "dog clutch" will introduce tremendous backlash if you
are thinking of running your servo drive through it. For a servo
connection you need to use a "hard" connection. Note that in a manual
mill, the feedback from the dial or from a scale is after the handle
clutch and thus the handle clutch backlash is not a factor.

So something like this would be better?
http://tinyurl.com/5uqt5ne

that's the coupling you normally see between the servo and ball screw.
0 backlash.