20" sanding discs

[Robert Hayward]

Where do buy your larger sanding discs? 20" is what I am interested in. Any brand better than the others? Do you use the same disc for metal and wood?

[Matt Day]

The 20” PSA ones I got from supergrit were crap. Kept delaminating until I applied some spray adhesive. Not buying from them again.

I’ll probably try Klingspor or something next.

[Ben Grefe]

Matt,

My 20 disc just has bubbles under it from delamination as well. What kind of adhesive are you using to fix this? I was hoping for a dead flat surface and that’s not the case here.

[Mel Fulks]

Check with pattern maker suppliers. Kindt Collins is a name I remember

[David Bolson]

I have no idea if these (https://www.amazon.com/Shop-Fox-D1345-Diameter-Aluminum/dp/B0000DD2DJ/ref=sr_1_1?dchild=1&keywords=D1345+disc&qid=1588482139&s=hi&sr=1-1) are better than others, but it’s what I have

David

[Alex Zeller]

I bought some Klingspor cloth backed ones in different grit off of ebay. They work well but the adhesive doesn't stick that well. I had some spray stuff for sanding pads so it didn't matter to me. I don't know if they were new old stock or if they are all like this. I personally like cloth over paper backing on the 20" pads. Unlike the 5" pads these last a long time and I didn't want to rip one prematurely ending it's life.

[Robert Hayward]

I have no idea if these (https://www.amazon.com/Shop-Fox-D1345-Diameter-Aluminum/dp/B0000DD2DJ/ref=sr_1_1?dchild=1&keywords=D1345+disc&qid=1588482139&s=hi&sr=1-1) are better than others, but it’s what I have

David

Prior to this post I had ordered two of these in 80 grit just to try them, they have not arrived yet. They are cheaper than most, if not all the others ones I have looked at online. Skeptical only because they are less money than others. Do you sand any metal with yours, or just wood?

[Robert Hayward]

I bought some Klingspor cloth backed ones in different grit off of ebay. They work well but the adhesive doesn't stick that well. I had some spray stuff for sanding pads so it didn't matter to me. I don't know if they were new old stock or if they are all like this. I personally like cloth over paper backing on the 20" pads. Unlike the 5" pads these last a long time and I didn't want to rip one prematurely ending it's life.

I see a lot of this brand for sale on Ebay all claiming to be top grade. Almost ordered a ten pack, thanks for telling us the adhesive is not the best. What is the "spray stuff" for sanding pads? Brand? I have a little 9" disc sander that I have a terrible time keeping the discs flat on the wheel.

[Alex Zeller]

The stuff I have no longer has a label on it. My guess is it's over 15 years old and no longer has a label. I got it back when I was doing a lot more automotive bodywork. The pressure sensitive pads would only stick so well so I got this stuff to help out. I tried looking for it but it's like nobody makes it now. The closest I could find that's available is 3M super 77. But it's not as good.

[David Bolson]

Do you sand any metal with yours, or just wood?

Just wood. Works fine for that.

[Matt Day]

Matt,

My 20 disc just has bubbles under it from delamination as well. What kind of adhesive are you using to fix this? I was hoping for a dead flat surface and that’s not the case here.

I used some 3m 77 I think it was I have around. Worked great. My disc has a little wobble, so I next time I change paper I’ll look into it and break the dial indicator out and see what’s going on.

I sand metal occasionally.

[keith wootton]

you will not go wrong with 3m 348d discs. i have gotten them from rs hughes, but lots of sellers of this quality product.

[Robert Hayward]

you will not go wrong with 3m 348d discs. i have gotten them from rs hughes, but lots of sellers of this quality product.

Thanks for the 3M number. I did not even know 3M had large sanding discs. I am a fan of 3M smaller sanding discs.

[Robert Hayward]

I used some 3m 77 I think it was I have around. Worked great. My disc has a little wobble, so I next time I change paper I’ll look into it and break the dial indicator out and see what’s going on.

I sand metal occasionally.

How is the 3M 77 when you want to remove a worn disc? I know the 77 and 90 are almost impossible to get off my hands. Not that I would spray my hand. :)

[Robert Hayward]

Just did a Google for the 3M 348d. HD popped up so I went there to check price. This is for a 12", do not even want to know what they want for a 20". :eek: https://www.homedepot.com/p/3M-PSA-Cloth-Disc-348D-20792/310532639

[Richard Coers]

Just a heads up. Metal and wood sanding on the same machine is a recipe for a shop fire. It's the closest I ever came to having a fire in a shop. Smelled smoke after shaping the end of a piece of steel earlier. Looked over and smoke coming from the sander. I had to quickly drop the bottom shroud to fine a glowing ball of sawdust. ABSOLUTELY DO NOT keep a dust collector hose on when doing steel, even with the dust collector off!!!!!! We ordered silicon carbide cloth backed from McMaster Carr when I was working in the model shop. I bought for the service and not for the price.

[Matt Day]

Spray adhesive comes off with a combination of razor blade and goof off.

[Ben Grefe]

Well annoyingly I picked up some other discs off amazon the other day, but the 348d discs are not much more (13 bucks).

Edit: Well Amazon’s severely delayed shipping has worked out in my favor this time. Cancelled my other order and picked up one of these 348d discs instead. Looking forward to it.

[Robert Hayward]

Well annoyingly I picked up some other discs off amazon the other day, but the 348d discs are not much more (13 bucks).

Is that $13 more than your other ones or $13 for a 20" disc? Mind providing a link? The ones I am looking at for around $16 each are in a ten pack. Just a hobby woodworker and do not need ten at a time. Buying two or three at a time puts the price well over $20 each.