I would like to add a power feed to the Y axis on my Speedway Mini-Mill (SIEG X2 style) while retaining the hand crank. So, I have an idea. Since I had a DRO, I don' use the indicator collars on the cranks. If I remove the indicator collar on the Y Axis handwheel, I would have a nice place to put a pulley that would need a 20mm bore, and be no more than 11mm wide and 50mm OD. I was hoping to find such a beast in a notched timing pulley style, but several hours of searching online have come up with nothing at all even close.
Any of you know where I could find such a pulley? The 20mm bore could possibly be made smaller if I could manage to turn down the handwheel in that area by putting it in my mini-lathe. The shaft of the Y axis leadscrew is only 10mm O.D. so I guess there would be some amount of stock I could remove to use a slightly smaller bore in the pulley. The 11mm width I mentioned could possibly also be increased if I machined down the mating portion of the leadscrew support facing the handwheel to some degree. I'd have to buy another one of those to do the machining, as I only have this one mill, but I would do so if needed.
The 50mm maximum OD is not very forgiving. I have a scale running along the leading edge of the table for the X Axis on the DRO, and so I need clearance for the scale's body section as the table moves toward me on the Y axis.
I suppose adding a jack shaft to the Y axis leadscrew might allow me some wiggle room on that aspect.....maybe. But I don't want to have the handwheel sticking too far toward me.
My plan if I could find such a pulley is to use another of the X Axis power drive units like I already have mounted, (like sold my Little Machine Shop and Micro-Mark) to drive the Y axis using a notched belt, with the power unit to the right of the handwheel. The left side is occupied with part of my Y axis DRO scale mount.
I thought about trying to put a stepper motor on it with a CNC type controller, but I've never seen that done while also retaining the handwheel, and it would make the handwheel stick out quite a distance if attempted, presenting the risk of my catching on it while working on other projects near the mill. Utilizing another of the X-Axis style self-contained drive and control unit would save me a lot of research and design. I just need to add it to the Y axis leadscrew somehow.
Any suggestions are welcome.