Disc Sander for table saw, what you think?

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Forum topic by patcollins posted 04-10-2011 07:19 PM 5270 views 0 times favorited 22 replies Add to Favorites Watch
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1603 posts in 2621 days

04-10-2011 07:19 PM

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


235 posts in 2518 days

#1 posted 04-10-2011 07:22 PM

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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1603 posts in 2621 days

#2 posted 04-10-2011 07:24 PM

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


4053 posts in 3044 days

#3 posted 04-10-2011 07:28 PM

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,

View SergioC's profile


82 posts in 2422 days

#4 posted 04-10-2011 07:29 PM

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

2685 posts in 3193 days

#5 posted 04-10-2011 07:39 PM

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


11812 posts in 3443 days

#6 posted 04-10-2011 08:09 PM

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


2496 posts in 2862 days

#7 posted 04-10-2011 08:15 PM

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


7714 posts in 3131 days

#8 posted 04-10-2011 08:32 PM

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 (online now)


3574 posts in 3124 days

#9 posted 04-10-2011 08:50 PM

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.

-- Artificial intelligence is no match for natural stupidity!

View Dusty56's profile


11812 posts in 3443 days

#10 posted 04-10-2011 09:09 PM

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


527 posts in 2935 days

#11 posted 04-10-2011 09:11 PM

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


116 posts in 2449 days

#12 posted 04-10-2011 09:16 PM

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


148 posts in 2650 days

#13 posted 04-10-2011 10:15 PM

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


1603 posts in 2621 days

#14 posted 04-10-2011 10:39 PM

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


527 posts in 2935 days

#15 posted 04-11-2011 02:01 AM

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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