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Fitting independent fine feeds to ML7 lathe

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Tim Stevens23/10/2017 11:46:20
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The toothed belt idea seems eminently sensible, but I wonder why a stepper motor is preferred over an 'ordinary' one? I would suggest two minor alternatives for the drive -

1. use a round belt as used on sewing machines etc. this would slip and screech if the drive was stalled.

2. use a pivoted jockey pulley on the tight side of the belt, and add a microswitch to switch off if the belt went really tight.

Both ideas are to avoid problems when you forget to disconnect the fine feed. Having some slack in the drive with a jockey pulley also makes it easy to slip the belt off when you want to cut threads.

Regards, Tim

Martin Kyte23/10/2017 12:03:18
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"why a stepper motor is preferred over an 'ordinary' one?"

One thing springs to mind. Doing the thing with a stepper does open the possibilities of semi or full CNC as future development. By semi I mean electronic saddle stops or maybe auto feed/return for clock wheel cutting.

But if fine feed is all you reqire then alternatives are as you say feasible.

regards Martin

Enough!23/10/2017 18:27:31
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Posted by Tim Stevens on 23/10/2017 11:46:20:

The toothed belt idea seems eminently sensible, but I wonder why a stepper motor is preferred over an 'ordinary' one?



If you're referring to my setup, Tim, my earlier post explains that this is part of my ELS system (not simply an independent drive for the leadscrew) hence the stepper.

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