Variable Speed Motor for Taig Lathe?

[Steamchick]

Yup! I needed a 12mm shaft for my lathe motor replacement, using the existing pulley. (It's not a Taig).
Hope I didn't confuse anyone?
I have attached a pdf of my re-motoring... Warts n All!
K2

 

[stanstocker]

I want a lower speed with some torque because I do machine steel on the lathe. Diameter is usually less than 1". I turned the C.I. piston of my current Webster build on the Taig, and I would have liked to lap the piston on the Taig, but I think the speed would have been too fast. I also think that I may have been able to machine the Webster steel cylinder with the Taig with lower speed and more torque. Actually, I may have been able to do it in it's current state. It's not that I don't have a bigger lathe. I just like to challenge my capabilities (somewhat limited) and the capabilities of the Taig. By the way, I regard the little Taig as very capable within its size limitations.

Thanks for the link. I do like the Penn State set-up. How is the torque at around 350 rpm?

I've never felt the torque was inadequate, but I rarely did anything in steel at the full diameter of the machine. I'd be inclined to invest in some name brand quality carbide inserts or brazed shank Micro 100 cutters before trying to add lower speed plus more torque. Never bothered to use a tach to see what the entire range of my set up is, this machine was in my clock shop where most everything that went on it was brass or small diameter steel. If I can find the darn tack and get the thing to read reliably I'll see how slow it gets and post later today.

EDIT NOTICE: "quality carbide inserts of brazed shank micro 100..." SHOULD have read "OR brazed shank..." Sorry for the awkward typo, both wrists have carpal tunnel issues, seeing a surgeon next Friday for a consult and scheduling for the worse wrist. In the meantime, I try to proof carefully, but typos abound. Stan.

 

[Danuzzo]

Yup! I needed a 12mm shaft for my lathe motor replacement, using the existing pulley. (It's not a Taig).
Hope I didn't confuse anyone?
I have attached a pdf of my re-motoring... Warts n All!
K2

That motor is very similar in appearance to the one I linked on Amazon. I really like what you did with the motor on your lathe.
Thanks.

 

[Danuzzo]

Thank you for the link. Looks like I should be able to find something there. As to size of shaft, I think the Taig is 5/8" which is a little larger than the 15mm; but, I should be able to make an adapter.

Could not edit my previous post. I measured the shaft on my Taig lathe motor, and it is actually 1/2", not 5/8". So, I would have to bore out the pulley for fit.

 

[stanstocker]

UPDATE ON THE PENN STATE INDUSTRIES MOTOR

The smallest motor pulley sheave was turned off as part of boring out the step pulley to fit the armature / motor shaft. Dug out my laser tach this afternoon and charged up some AA batteries. Turns out my lowest speed with the slowest pulley settings is around 950 RPM. No good for your needs. I'll open up the speed controller box to see if there is a low speed trim pot that can be tweaked a bit to slow it down. If there is success I'll post the results. The controller only has around a 2:1 adjustment range, seems awfully limited compared to the wide range we see with the Sherline controller. Maybe the PRC KBIC clone is not so hot. The higher speed than expected never mattered to me, but I was surprised to see about 1K as the slowest! When all you do is small diameter stuff you rarely go much below 1500 to 2000 RPM, and drilling was always done with straight flute solid carbide when repivotting clock arbors. With that said, the motor controller needs some adjustment if possible or is defective or just plain poor quality. If it seems needed there is a spare genuine KBIC controller at hand, it can be patched in to see if that improves things. We'll see.