Sanding machine

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Forum topic by Edwin posted 06-05-2010 05:14 PM 1427 views 0 times favorited 4 replies Add to Favorites Watch
View Edwin's profile


143 posts in 3239 days

06-05-2010 05:14 PM

Topic tags/keywords: question

I was thinking about building a overhead sanding machine. I pretty much have it figured out how to build it but one question keeps poping up, Ive’s got a 1750 RPM motor spinning a 4” shaft connected to two pillow blocks…...
Here is the question (Don’t laugh) when you feed the wood in what keeps it from flying out the other side???

-- Ed Port Republic

4 replies so far

View levan's profile


472 posts in 3220 days

#1 posted 06-05-2010 08:25 PM

all the manufactured machines rotate, so the board would actually be pushed back to the infeed side

-- "If you think you can do a thing or think you can't do a thing, you're right". Henry Ford

View richgreer's profile


4541 posts in 3316 days

#2 posted 06-05-2010 09:25 PM

levan is right. The drum should spin such that the pressure will be to the input side.

Are you using pulleys that speed up the rotation of the drum? I ask because, in my experience, 1750 is too slow for optimum performance. Most commercial sanders with 3 – 4 inch drums are spinning around 3000 rpm.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Edwin's profile


143 posts in 3239 days

#3 posted 06-06-2010 12:11 AM

I was thinking about 3” sprockets, that should speed up the the speed of the drum, I’m open to sugesstion ???

-- Ed Port Republic

View rance's profile


4267 posts in 3402 days

#4 posted 06-06-2010 01:21 AM

Ed, The size of one sprocket has little to do with the speed. It is more the ratio of size on the motor shaft and the drum shaft. The ratio of the two sizes can be used to increase or decrease the resultant speed of the drum. I’d strongly suggest you look at the design from ShopNotes before moving past your design phase. Goole “Drum sander”. I’m building the ShopNotes model but with some modifications. I’m building it as a stand-alone as opposed to running it from my saw. I’m also motorizing the platten using a rotisori motor. In any case, I think you’ll love your new machine. Go for it.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

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