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post #1 of 5 (permalink) Old 08-15-2010, 08:11 PM Thread Starter
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Default Shaft adapter bushing?

I'm trying to make a low speed power strop primarily for my carving chisels and gouges, but it would also be useful for putting that final cut-you-without-you-knowing-it edge on some of my other stuff... like plane irons.

I have a couple of .75 HP electric motors that turn at 2800 RPMs. I don't need a ton of torque. This ain't like a grinder. But I do need to bring that speed down. The motors have quarter inch shafts. I can find drive pulleys for quarter inch shaft but they're Delrin timing pulleys (toothed). I'd like to just use a small v-belt pulley. If I can get a 1 inch pulley on the motor, I can use about a 4 inch on the driven shaft to get the speed down to about 700RPM.

I've found shaft adapter bushings to go from 1/4" to 5/16", but haven't found one to go 1/4" to 1/2" which is where I should be able to find a better selection of v-belt pulleys.

Anyone wanna help me out by tossing out some ideas here? I'm over thinking this one I'm sure.
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post #2 of 5 (permalink) Old 08-15-2010, 09:02 PM
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Hi Charlie

A old sewing machine would work for that job plus you can use a o-ring for the drive belt..

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post #3 of 5 (permalink) Old 08-16-2010, 07:10 AM Thread Starter
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Thanks, Bob. Yeah I had thought about the sewing machine motor, but many of them spin at 5,000 to 7,000 RPM. I know there are some that spin slower. However I found these 2 motors as I was unpacking stuff into my new shop and was going to try to use one of them. They are old exhaust fan motors from Broan exhaust fans. The fan is on the shaft with a set screw. I thought it would be easy to just get a couple pulleys and a double end bench mandrel. I can find the bench mandrel no problem. It's the pulleys that are driving me nuts. Maybe I should be looking at a sewing machine parts place.

For anyone else looking to do this, the Grizzly G5548 1/2 inch bench mandrel is a pretty good deal at $30 with ball bearings...

Now if I can just find the pulleys.
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post #4 of 5 (permalink) Old 08-16-2010, 10:05 AM
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Hi Charlie

The one I use is running at 700 rpm. and with the foot switch it's VS from the sewing machine also with tons of power from that little motor.


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Quote:
Originally Posted by reikimaster View Post
Thanks, Bob. Yeah I had thought about the sewing machine motor, but many of them spin at 5,000 to 7,000 RPM. I know there are some that spin slower. However I found these 2 motors as I was unpacking stuff into my new shop and was going to try to use one of them. They are old exhaust fan motors from Broan exhaust fans. The fan is on the shaft with a set screw. I thought it would be easy to just get a couple pulleys and a double end bench mandrel. I can find the bench mandrel no problem. It's the pulleys that are driving me nuts. Maybe I should be looking at a sewing machine parts place.

For anyone else looking to do this, the Grizzly G5548 1/2 inch bench mandrel is a pretty good deal at $30 with ball bearings...

Now if I can just find the pulleys.



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post #5 of 5 (permalink) Old 08-16-2010, 10:27 AM
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I've seen Bjs setup, even though it's a couple thousand miles away. And I hope he's still keeping his eye open for me. I want one.

The foot pedal and SM motor make the best sense. Garage sales. Check those, and craigslist. Throw away the machine, keep the electrics. Just as long as it isn't a digital SM.

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