Sandpaper for Disc Sanders - Supplier recommendations?

E

ernestrome

Joined
Jan 25, 2006
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I just started using 9x11 sheets on my 9" sander, with 3m77 spray to glue them on.

Who are good online or local suppliers for sheets, and are there particular brands that are preferred, 3m norton etc? I am looking for fine sheets from 220 up to 1200 or 1500 for final polishing, I think they will be quite shortlived in this application so wondering if cheaper sheets would do nearly as well?

Should it try to get zirconia, or is silicon carbide ok for this? Or even AO?

Thanks
 
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Hi - I like to buy sandpaper from Pop's, the Klingspor stuff is rather nice but not super cheap. If you want to try your luck with cheap, you can give SuperGrit a shot. You'll only be out a few bucks to try and compare. I think, however, that you'll find that it's worth the name brand for SC sheets. I haven't found budget SC to be nearly as long lasting and the grit variance can get annoying.

Have never used zirconia paper for hand sanding or on a disc, can't say if it's better, but I can say that I never liked zirc belts on a grinder. Seem to be too much buck for the bang, imo.
 
Thank you both.

I think I'm going to order from supergrit as they have 10packs, I can't afford to buy 50 or 100 of each grit.
 
You might call Pop and see if he can mix and match for you. I'm not saying he'll do it, but he offers a lot of things over the phone/in-person that are not on the website.
 
Check out onlineindustrialsupply.com very economical and seems to stand up well- I JUST GOT SOME 120-220-1000 and seems to work well on my disc grinder
 
The source is not the problem, it is the use. Using a 9" disc for fine finishing is likely to yield an undesirable surface look.The circular pattern of the disc may be a problem in fine grit.
I use the disc sander a lot up to 220 grit, but switch to a belt at 400, and finish by hand from 800 to 8000.

I like Klingspor products.
 
Steve Johnson seems to do OK with the disc sander at 400. To be fair, he's not flat grinding blades, just finishing other flat surfaces.
 
Ok I may try discs up to 600, then i have a 600 cork belt, and am planning on adding a felt belt to load with compound. I have 9 3 and 1 mic films too for hand finishing too.


What are your opinions on adding a cork, foam or rubber layer to the disc? Desirable or necessary?

The blades are totally flat kitchen knives.
 
Some folks add a hard rubber backing to their disc. It is OK for finer grits, but most like a plain milled steel disc with a 1% bevel.

Another good thing to have on the disc grinder is a reversible motor . If you can reverse the disc, you merely have to stop it, flip the blade to the other side, and start the motor again ( in reverse). This makes all grinding go from spine to edge. VS is always a plus,too.
 
I use my disc up to 400 grit, after that I use the rubber backing, the finer disc's tend to tear. I use the repositionable adhesive instead of the 3m 77. It's easier for taking the disc's off.
 
If you're calling the folks as SuperGrint for paper, order the RhynoWet. It's not the cheapest stuff they have, but it's far and away cheaper than Klingspor, etc. It's the fastest cutting paper I've ever seen and it just keeps going, and going, and going...

I'll usually go through 1/4-1/2 sheet of each grit I use in finishing a medium 4-5" blade knife.

It's nice living 20 minutes from SuperGrit...I've been able to try one of this and one of that over the years to find what works well for me. Everybody I've handed RhynoWet paper to has loved it.

-d
 
I hope this isn't off the topic, but I've been looking to buy a dedicated disc grinder from Beaumont metal works, and I noticed that the discs have the 1 degree bevel. Wouldn't this keep the work piece from being perfectly flat? I may be understanding this incorrectly, but does the disc have a cone shape?
 
The 1 degree difference is so that if you put a flat ground blade it won't pull the blade two different directions at once. You really only have 4 1/2 inch of the blade on one flat surface.
 
if you want a coarse heavy duty disc for hogging, you can get what i have been using for the past 3 years on mine. i get right angle grinder discs that have a hole in the center. i spray glue them on and they eat like crazy.

i have 24 grit on both discs i have. i have ground knives with 8" cutting edges on these discs with the hole in the center without any problems. it helps to lay them in the sun to flatten them out and keep them clamped between boards after.
 
david, i have a 1 degree taper in mine and it does make a difference. i had one that i left flat and i had to cut a taper in it. i plan on making one with a 2 degree just to see how it works.
 
robloveday said:
I hope this isn't off the topic, but I've been looking to buy a dedicated disc grinder from Beaumont metal works, and I noticed that the discs have the 1 degree bevel. Wouldn't this keep the work piece from being perfectly flat? I may be understanding this incorrectly, but does the disc have a cone shape?
Click to expand...

You can buy both bevelled, or flat.
 
Hi Richard J, I read a post by Rob Fink? (KMG Manuf) once talking about the 1 degree angle would not have an effect on angle of a blade giving some measurement of how extremely slight the angle created is. But I do understand that it makes the job easier to not cross center as easily. Do you want the 2 degree for angle of grinding or ease of use?
David
 
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