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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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#1
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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. |
#2
Posted to rec.crafts.woodturning
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Slowing down the Jet 1442
"Prometheus" wrote: (clip) A regular electric motor turns at 3450 rpm, IIRC. (clip) ^^^^^^^^^^^^^^^^^^^ Most fractional HP motors run at half that speed: 1725. If your motor does actually run at 3450, you can cut the speed in half easily by just changing motors. However, most lathe manufacturers try to provide as low a speed as they can with a practical pulley ratio and the more common motor RPM. Rather than going to the trouble of mounting an extra motor, with all its complications, consider the possibity of mounting a countershaft and using the same motor. I would start looking for a lathe that runs slower, or shopping for a variable speed drive. |
#3
Posted to rec.crafts.woodturning
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Slowing down the Jet 1442
"Leo Lichtman" wrote in message ... "Prometheus" wrote: (clip) A regular electric motor turns at 3450 rpm, IIRC. (clip) ^^^^^^^^^^^^^^^^^^^ Most fractional HP motors run at half that speed: 1725. If your motor does actually run at 3450, you can cut the speed in half easily by just changing motors. However, most lathe manufacturers try to provide as low a speed as they can with a practical pulley ratio and the more common motor RPM. Rather than going to the trouble of mounting an extra motor, with all its complications, consider the possibity of mounting a countershaft and using the same motor. I would start looking for a lathe that runs slower, or shopping for a variable speed drive. Leo, Arch too, the 1442 is a Reeves. Neither idea put forward works particularly easily or well. Shopping will. |
#4
Posted to rec.crafts.woodturning
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Slowing down the Jet 1442
On Sat, 19 May 2007 21:00:48 GMT, "George" wrote:
"Leo Lichtman" wrote in message ... "Prometheus" wrote: (clip) A regular electric motor turns at 3450 rpm, IIRC. (clip) ^^^^^^^^^^^^^^^^^^^ Most fractional HP motors run at half that speed: 1725. If your motor does actually run at 3450, you can cut the speed in half easily by just changing motors. However, most lathe manufacturers try to provide as low a speed as they can with a practical pulley ratio and the more common motor RPM. Rather than going to the trouble of mounting an extra motor, with all its complications, consider the possibity of mounting a countershaft and using the same motor. I would start looking for a lathe that runs slower, or shopping for a variable speed drive. Leo, Arch too, the 1442 is a Reeves. Neither idea put forward works particularly easily or well. Shopping will. Prometheus has a good idea and it does sound like a lot of work. I do however have an extra motor from my old lathe - montgomery wards power-craft. I think would rather turn more at this point than try to add extra pulleys. I will keep my larger wood pieces until such time I either get more ambitious to try the pulley scenerio or spend $$$ for the right lathe. Thanks eveyone! Jimbo |
#5
Posted to rec.crafts.woodturning
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Slowing down the Jet 1442
Jimbo wrote:
I will keep my larger wood pieces until such time I either get more ambitious to try the pulley scenerio or spend $$$ for the right lathe. Thanks eveyone! Jimbo That's the same decision I came to when I was given two huge chunks of cherry*. They have been slowly drying in a corner of my basement for three years now. I figure that by the time I have the skills to do justice to them I will probably also have the equipment. So far I am still turning on a HF 12x36. :-( Bill *Yeah, that counts as a gloat. They are coffee-table sized and ~6" thick. Not sure if they are going to end up as flat work or turned ... but, done well, either I'm going to have something my sons will fight over when I'm gone or somebody else is going to give me a lot of money for seizing an opportunity labeled "free firewood". --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 000742-1, 05/22/2007 Tested on: 5/22/2007 10:34:01 AM avast! - copyright (c) 1988-2007 ALWIL Software. http://www.avast.com |
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