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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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Slowing down the Jet 1442
On Thu, 17 May 2007 16:45:57 -0700, Jimbo wrote:
I was wondering if it is possible to in any way to slow down the motor on the Jet without damage to it. It would be possible to make a "souped up light dimmer" which is very doable but will it cause damage to the motor? After getting into turning I wish I would have bought a lathe that goes slower for larger pieces. As others have noted, the dimmer switch is probably a bad idea, but depending on how badly you want the thing to go slower, I've got an option for you. It you get yourself a left-hand tap that matches your headstock spindle on the outboard side, you could laminate a couple of pieces of plywood together to make a big pulley. Tap the center, and thread it on to the spindle, then turn it to the size desired and turn the groove for the v-belt. Then, get yourself another motor. It doesn't have to be fancy, and a lot of lathes don't have a huge amount of horsepower. If you were to dig up something like a 1/3 or 1/2 hp electric motor from an old appliance, that might do the trick. You'll have to mount the motor to something, and get a small pulley on it. When you want to turn slow, release the tension on your main belt so that the spindle will turn easily, and won't burn up your main belt, and hook up the secondary motor. A regular electric motor turns at 3450 rpm, IIRC. Reduction in speed is a direct ratio between the two pulley sizes. Don't hold me to the math, but if you were to have a 2" pulley on your secondary motor, and a 20" pulley on the outboard side of your lathe, you should get a spindle speed of 345 rpm. You get the idea, anyhow- the larger the difference between the small pulley on the motor and the large pulley on the spindle, the slower the lathe will turn. It'd be kind of a goofy looking contraption, but it's pretty straightforward and can be done cheap- without risking damage to your lathe's original motor. If you want it going really slow, with smaller pulleys, make a double or triple-reduction setup, mounted on a bit of plywood or a board. If you need the slow speed for outboard turning, put the pulley on the inboard side with a right-hand tap. Or, skip the tap entirely, and mount the pulley on a faceplate- whichever makes more sense to you. If you're really safety concious, make a plexiglass guard to cover the pulleys and belt. That would be the way I'd do it, if I wanted to do such a thing. |
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