Electronic Leadscrew for the New Lathe

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vtsteam:
Phil, :beer:

I do have some 400+ oz in steppers already, though intended for another project. I guess I could use one for this.

re. capacity I definitely wouldn't expect to do 3" x 8 tpi on this little lathe (mini-lathe 7x12 class). More like a max threading capacity of say1" x 8 tpi acme in mild steel.

If it seems marginal even w/a 400 oz in stepper @ 4 to 1 as a threading spindle motor, then it probably isn't what I want -- something physically large with commensurate power supplies, and support space taken.

The spindle stopping issue is something to think about.

awemawson:
Well my first NC mill was all hydraulics with Moog proportional valves, but amusingly the way that they did 'rigid tapping' was to have a feedback 'quill' follow a master thread attached to the main spindle. Any error following the thread pitch resulted in follower deflection and adding a correction factor to the hydraulic equivalent of a 'summing junction'

vtsteam:
Norman, thanks, much to absorb........ :coffee:

vtsteam:
Simon, thanks. But I don't quite understand..., sorry! :scratch:

Fergus OMore:

--- Quote from: vtsteam on March 29, 2015, 11:34:55 AM ---Simon, thanks. But I don't quite understand..., sorry! :scratch:

--- End quote ---

I do. This was what my Pools Major had. There was a peg in the gear- which moved the saddle etc-mine from the back. This malarkey would cut tapers. :doh:

N

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