Re: encoding free leadscrew end?

I mounted linear encoder on the back of the lathe bed with the push rod
being driven by the carriage. It is out of the way and was easy to install.
I used a couple existing hole for the cross slide cover to mount a bracket
that hold the encoder drive rod.
I used a linear encoder on the cross slide as well. It was mounted above the
carriage where it would not interfer with the handles, the chuck or the
travel of the carriage.
Dan
-----Original Message-----
From: stratton@... <stratton@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Saturday, September 25, 1999 9:05 PM
Subject: [CAD_CAM_EDM_DRO] encoding free leadscrew end?

>From: stratton@...
>
>Now that I have a linear encoder strip up on the Z axis of
>my lathe, I'm thinking of putting a salvaged 500 cpr rotary
>encoder on the crossfeed screw.
>
>On the South Bend and similar lathes, the back end of the screw is
>unsuported, so the slide can in fact simply be cranked off the back of
>the machine. I'd like to put the encoder back there so as to not
>interfere with the handwheel end.
>
>The main thing I need to figure out is how to make a removeable
>attachment to the end of the screw. There is a center hole that I was
>able to get a drill into, and could probably tap - but runout would
>I'm sure be excessive. Another idea would be to turn a brass sleeve
>that would fit over the end of the screw, then reduce to go through a
>small bearing and then the necessary thin shaft for the encoder wheel.
>Thought about just gluing that on. Even if I do get it attached, I'm
>not sure if there will be any issues with constraining the back end of
>a screw that has been running free for 30 years and might well be
>slighly bent. Any ideas?
>
>Also, the rear cover/extension of the cross slide has to pass over the
>top of all this, and the stock encoder housing is just barely too big.
>Guess I'll have to make another with thinner walls.
>
>Chris
>
>--
>Christopher C. Stratton, stratton@...
>Engineer, Instrument Maker & Horn Player
>(978)538-5179 work, (617)492-3358 home
>30 Griswold Street Cambridge, MA 02138
>http://www.mdc.net/~stratton
>
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