Gallery, Projects and General > Project Logs
Building a New Lathe
vtsteam:
Thanks guys! :beer:
Catching up on house chores for a day. So I've been out of the shop.
I think the next thing to do will be cast a spindle pulley. The spindle necks down for a few inches at the left end, and the threads and retaining nuts are at the bitter end. So there's no way to put tension on the bearings (and therefore install them) until there's at least a sleeve (or extended pulley hub) on the left to bear against the leftmost roller bearing and put pressure on the assembly.
The spindle is a force fit in the bearings, so nothing is assembled yet.
Might as well be a pulley, then. Likely a toothed belt, but I haven't decided on the exact type yet, nor the size of the pulley(s). The treadmill motor is rated at 2.5hp @130 DCV 18A @ 6700 RPM nameplate. but I doubt it will run anything like that speed, from experience. Or HP. That must be no-load speed. I had no trouble boring at ~100 RPM w/ a crude 5" to 1.5" vee belt reduction.
vtsteam:
I'm thinking XL Belt, 18T on the driver and 90T on the driven pulley. Those are two easy numbers to do on my spin collet, lacking a dividing head, since it does degrees. I should get about 1000 RPM top without a change in the driver pulley.
That pulley would be 5.68" diameter. So I can make a 6" pattern. Aluminum, this time, for easier notching.
vtsteam:
Raining today, and had to prepare for my daughter's birthday, but I managed to make the pulley pattern, which I turned from poplar on the Gingery lathe. Rain predicted for the next few days.
vtsteam:
I'm going to try casting today between rains, if I can. This morning I found an older driver pulley pattern and turned up a new steel core for the driven pulley. These will stay in the mold. The tapered ends allow easier positioning.
vtsteam:
The sun came out for a bit, so I quickly rammed up a mold a melted a pot full of aluminum. It took a false cope and smoking the core piece over a candle, but otherwise a pretty simple job. Here's the shake out:
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