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Disc Sander for table saw, what you think?

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Forum topic by patcollins posted 1237 days ago 4118 views 0 times favorited 22 replies Add to Favorites Watch
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patcollins

994 posts in 1499 days


1237 days ago

I have been thinking about cutting a disk out of MDF putting an adhesive backed sanding disk on it and mounting it to my table saw so I can use my miter gage to sand perfect 45 degree angles. Any thoughts or reasons why its a bad idea?


22 replies so far

View cabs4less's profile

cabs4less

235 posts in 1396 days


#1 posted 1237 days ago

yeah its a bad idea you would have to balance the mdf perfectly for it to run true and the thickness would be an issue plu woodcraft sells a metal plate just for this for about 15.00 i think and its safer

-- As Best I Can

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patcollins

994 posts in 1499 days


#2 posted 1237 days ago

I ws going to get the metal plate from woodcraft until I read a review that said it wasn’t flat. I don’t think balancing will be an issue, the RPM is actually fairly low compared to the model airplane props that I have balanced.

View bigike's profile

bigike

4031 posts in 1922 days


#3 posted 1237 days ago

I don’t see anything wrong with it. It’s the same as the disc but made from wood the only thing would be accuracy.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View SergioC's profile

SergioC

82 posts in 1301 days


#4 posted 1237 days ago

MDF is also not very durable and it would probably eventually explode. I don’t know about the woodcraft plate, but I wouldn’t put much stress parallel to the blade shaft since it isn’t made for that. It could bend the shaft.

View Craftsman on the lake's profile

Craftsman on the lake

2383 posts in 2071 days


#5 posted 1237 days ago

I have a 10” 1/8” aluminum plate that works nicely. I used to use it a lot to sand formica strips before I had a router.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View Dusty56's profile

Dusty56

11644 posts in 2321 days


#6 posted 1237 days ago

I made a disc from MDF for my JET mini lathe and although it appeared to be flat while sitting still , once it started to spin , it’s a different story. I don’t know how many thousand rpms your TS turns at , but I’m sure it exceeds my mini. The problem with mdf is that it is not uniform and can self destruct in no time and will come and go with humidity changes as well.
I’d spend the cash on a real disc meant to be on a saw arbor…at least if it self destructs and maims / kills you , your family lawyer will have somebody to sue !

-- I'm absolutely positive that I couldn't be more uncertain!

View lilredweldingrod's profile

lilredweldingrod

2495 posts in 1740 days


#7 posted 1237 days ago

A TS turns around 3400 to 4000 rpm, depending on the pulley setup. If the MDF lets go, that is almost a guaranteed bad accident. The aluminum plate is inexpensive and it takes a lot more centrifugal force for it to fail.

View knotscott's profile

knotscott

5428 posts in 2009 days


#8 posted 1237 days ago

I’d think that the RPM would be well beyond what most sanders spin at.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View papadan's profile

papadan

1139 posts in 2002 days


#9 posted 1237 days ago

Disc sanders with a belt sander added can be picked up fo a hundred bucks new, half that or less used. I would not put that kind of side stress on my TS arbor. Besides the side stress I would think that high of RPM would burn more than sand. Buy a dedicated sander made for the purpose.

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

View Dusty56's profile

Dusty56

11644 posts in 2321 days


#10 posted 1237 days ago

Agreed on the high RPM burning rather than sanding , unless you are using maybe 36 grit ? LOL

-- I'm absolutely positive that I couldn't be more uncertain!

View JasonWagner's profile

JasonWagner

523 posts in 1813 days


#11 posted 1237 days ago

I have a 10” metal plate on my RAS that I use to sand. I’m not sure of the RPMs but it’s probably close to the table saw. It works fine for me. However, I wouldn’t make my own, I would buy a metal plate made for that use. Homemade sounds like you’re asking for trouble.

papadan – in my experience I barely put any pressure on my sanding disc and usually have to be careful not to take off too much wood. With proper grit for the job I don’t think there’s much lateral pressure at all.

-- some day I hope to have enough clamps to need a clamp cart!

View gbrown4's profile

gbrown4

108 posts in 1327 days


#12 posted 1237 days ago

My Dad gave several sanding disks he made from 10” self adhesive sanding disks. He stacked several together and cut a hole in the middle with a hole saw. I then stick them to the sides of my saw blades. It works great.

-- Greg, Concordia, Mo

View justinwdemoss's profile

justinwdemoss

146 posts in 1529 days


#13 posted 1237 days ago

I have to agree with lilredweldingrod. I got craftsmans metal plate about 6 or 7 years ago for my jobsite saw and the thing threw my workpiece across the garage and dinged the drywall on the very first time I put wood to sander. Now, I am sure this was novice error, but I took the thing right back to sears and got a disc/belt sander on CL that turns much slower and with less torque.

-- Justin in Loveland, OH

View patcollins's profile

patcollins

994 posts in 1499 days


#14 posted 1237 days ago

Papadan, I know a disc/belt sander is pretty cheap I have one.

What I am trying to get is accuracy and the ability to use a circle jjig to sand the circles that I cut with my bandsaw. The tiny support on disc sanders just don’t cut it. Maybe I will have to buy a harbor freight disc sander and build a nice big table for it, but I was hoping to also save space by using the table saw.

View JasonWagner's profile

JasonWagner

523 posts in 1813 days


#15 posted 1237 days ago

you need to sand on the half (actually 1/4) of the disc that is going down into the table…if you sand on the side that is coming up from the table you will end up with a projectile.

-- some day I hope to have enough clamps to need a clamp cart!

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