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Hello Bill, I prefer the simplicity of a mechanical system over a digital one, although they each have pluses and minuses. To each his own I guess. Dick

John Dammeyer's ELS will do that. He's installed them on his Gingery Lathes and a SB Heavy 10L. Somebody has put one on a Unimat, as well. Uses a 1ppr encoder to track spindle speed, since those were

The Carlco unit was fitted under the base, below the headstock with a toothed belt drive from the spindle, then the output shaft was on the centre line under the base, with a second toothed belt up to

I recently bought one of his ELS units, fully assembled and tested, $150+ shipping from Canada. Not planning on putting it on my Unimats, though. Going to put it on the Smithy CB-1220XL my brother

There's another group on groups.io : E-Leadscrew That should be cheaper and better. "ELS" - Electronic Lead Screw — is an alternative to full CNC for simple bench lathes — especially those lathes

True enough, but you can still employ the Unimat to chuck the part and use the tailstock center to line it up straight while tapping. Tim in VT

Hello Keith, I also think it is possible to couple the lead screw to the spindle through a set of change gears to obtain various thread leads. It could be an interesting design exercise but not very

Thanks Peter I think a tap is the right answer to 27 tpi. The sl approach may have been a force fit because i have a “new” toy. Best Regards John

You have a ‘65 Lotus Elan?? I'm greener than green with envy... my favourite car when I was a lad (I'm a '57 model) and it probably still is... (Some wags say Lotus stands for 'Lots of trouble,

Actually, looking at it again I find that a simple ratio of 16:17 from the chuck to the leadscrew will give a pitch of 26.9875 tpi -probably good enough for what I suspect is a short collar. However

Look for *CarlcoPatent4171649.pdf* in the Files section. Much discussed long ago. It represents the only practical way to add a threading and feeds box to the DB/SL, but I reckon anyone doing it now

There used to be a weird system that kind of did that but it was a big box that sat under the lathe and only did a few threads. Not sure where you'll find info - check the Links section which is

Would you be willing to share the dimensions or provide a link to your source? I'd like a chance to take a hack at making some using subtractive manufacturing. ;) Bill in OKC? William R. Meyers,

Found the dimensions. Made some STL files for the 3D people.

Having both a U3 and an SL, each with it's appropriate threading accessory, I absolutely agree with Matt. In fact, it would be simpler to build an attachment from scratch than to try to adapt the

Not really. It would make far more sense to sell it and buy the correct attachment.

Would it be feasible to adapt the Uni 3 threading attachment to the Unimat DB 200?

Hi Gang: If what you are tapping is thin, a 26 or 28 tap could cut a usable thread. Carl.

Hi Gang: The masters have no relationship to the form of the cut thread. The thread form between the master and the follower might not matter either. As a tool designer I would harden the circular

Hi Gang: Here is a customized Unimat with several bright ideas: