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I am putting this on the backburner for a while. Now at least I know the direction I want to go. Thank you for all the responses.

Update: I was ready to buy one on Amazon like the one I linked earlier (https://www.amazon.com/XXSTAR-Controller-Drilling-Woodworking-Machine/dp/B0CMV558SD?tag=forumyield-20). However, it and ones like it on Amazon all have a threaded pulley shaft. I need a plain one. Any other ideas? EDIT: I...

Brian, don't know if they ship to Canada; but there is one (Doug Kelley book) on Amazon US.

Thanks. I have the rotary table and chuck. I will check out the 24 diametral pitch set of gear cutters.

Brian, I hope you don't think I am trying to hijack your thread. I searched the web for a look at the table of contents for the book, and I was unable to find one. Can you just answer one question. Is there a section in the Duclos book about cutting gears for the i.c. engine? I am working on a...

Brian, what are the titles of the books you already have for basic plans for I.C. engines? I would be interested in finding those on Amazon.

Thanks Stan. I don't know if I am being presumptuous here; but, please do not tweak your controller for my sake. I am actually inclined to go with a set-up like the one I linked, and not the Penn State.

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.

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.

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...

Thanks. You made it very simple to grasp. I would imagine the torque of the motor would not be great at 200 rpm, but I don't think I will need to go that low. To get 100 rpm at the spindle, the motor rpm would need to be approximately 350 giving me around 105 rpm at spindle. The motor torque...

I found one on Amazon. Looks just like the one Timo showed. Here is the link: https://www.amazon.com/XXSTAR-Controller-Drilling-Woodworking-Machine/dp/B0CMV558SD It goes down to 200rpm. Anyone know what the torque would be like at this rpm? Anyone using one of these? Edit: With the 200rpm...

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.

I saw something like that for a Taig somewhere. Maybe YouTube. I like the idea.

Current motor (no pun intended) is 1/4 H.P. Rpm is 1725. That picture you posted interests me. I would need 110 (120) volt however. The Taig lathe needs very little H.P. to run.

Let me preface this thread by saying that I know very little about electronics. However, I want to modify my Taig lathe by replacing the AC motor with one that I can use a reduced speed. The lowest spindle speed on the stock Taig is around 525 rpm. I have seen that many have converted to a DC...

Thanks. Piston is same dimension along it's length. It is the bore that has a slight gradual taper of around .0003" (larger at BDC). Tested the fit this morning after adding a very light oil film last night and find the fit to be what I think it should be. I am satisfied.

Thank you again. You mention "gears". I will have many questions on the gears in another thread when I reach that point. I have never made gears; but I desire to learn how to do so.

I understand TDC and BDC. However, I am trying to envision how far the top of the piston goes above the port hole near the top of the cylinder when at TDC. Thanks for the compliments and encouragement.

I got the piston lapped to a fit that I think should work. Fingers crossed. It is a bit tight at the top. Piston is done except oil tube. Hear are some photos.