The servomotor used is from here.
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https://www.quicksilvercontrols.com/shop/17-silvermax-23-frame-xt-series
I suppose a dividing head is a handy way to put a geared down chuck on a mill, but mounting a drive-able chuck can be done.
As indicated by the postings, CNC fans on this site would use a DRO output, and the motor encoder output (or stepper pulses), and count their way to making a helix.
One of those servomotors is getting on for half the price of my entire mill drill !
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I do have a couple of (rather more powerful) servomotors with high resolution encoders. There they are lurking on the right side of the picture, sneaking in to steal the show for the South Bend bits restoration. These were salvaged rescue parts from an upgrade job. The video was interesting, and, of course, it was giving me ideas, but I think the mass produced stepper motors like the Nema 34 + Servo Drive eletronics in the eBay offering (
£126.10) seems a more cost effective choice if one wants to do this stuff.
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One thing that the CNC guys always seem to do is replace the mill leadscrews with zero backlash ballscrews.
This is, of course, all well out of my league, but I loved the video!