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Forum topic by Keith Kelly posted 05-27-2016 05:03 PM 343 views 0 times favorited 2 replies Add to Favorites Watch
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Keith Kelly

223 posts in 1123 days


05-27-2016 05:03 PM

Last year, Grizzly had a pile of 50 or so motors for $25-75 (marked down from $200-400).

I primarily use my lathe as a freehand slowish-speed soft disc sander (faceplate + plywood + mousepad + sandpaper). I’m thinking it may be nice to have a standalone device for this purpose, so perhaps a basic rotating motor may be good.

For this use, what kind of specs should I look for? My assumption is a slower one, like 1750 RPM so I don’t have to reduce it as much with pulleys, and that 1/3hp or lower would be ideal.

(heck, I might just look for another benchtop lathe…this one came from last year’s tent for $65)

Is there anything in particular I ought to look for in the pile of motors for this sort of purpose?

-- Keith - Bolivar, Missouri, http://www.SquareOneWoodworks.com


2 replies so far

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HokieKen

1735 posts in 598 days


#1 posted 05-27-2016 05:12 PM

I think the motor is largely dependent on the disk size. The larger the disk, the faster it will be turning at it’s outer edge. So for a large disk (16-20”), you might need a 1/2 hp stepped down to around 1.5:1. I’d say for 8-12” a 1/3 hp 1750 rpm motor would be good for directly driving the disk or with 1:1 pulley ratio.

-- Kenny, SW VA, Go Hokies!!!

View Keith Kelly's profile

Keith Kelly

223 posts in 1123 days


#2 posted 05-27-2016 05:24 PM

ok, thank you, that was helpful.

-- Keith - Bolivar, Missouri, http://www.SquareOneWoodworks.com

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