identify grinding wheel

[darryl]

I found these black grinding wheels, they are 2.5 diameter, 3/4 wide, with a 3/8 hole. On one side it says Pacific Mos 14,520, on the other A46-P9-B03. Anybody know what these are? They came packaged in a group of four, strapped together with fiberglass tape.

Somebody must have had lots of these on hand, as there are about a dozen or more packages in this flea market find. If nothing else I can certainly spin one up and see what it will cut. It appears to me that the original use would have required changing them out on a regular basis. Maybe in the railroad industry, or mining perhaps-

[MattiJ]

...or for foundry work, some of them use a LOT of abrasive wheels.

https://www.highspeedtraining.co.uk/hub/grinding-wheel-marking-system/

Aluminium oxide, 46 grit, medium-hard, medium density, resin bonded? Sorry, no exotics like CBN

[metalmagpie]

I have a largish electric power tool which is a grinder but not an angle grinder. I believe it's just called a "handheld grinder". It uses a wheel a bit bigger than yours, but it has some kind of resilient resin bond so the wheel doesn't shatter if you mistreat it slightly. Maybe yours fits someone's handheld grinder. Or, maybe your wheels fit a small grinder which is part of a vertical bandsaw's blade welder.

metalmagpie

[754]

Snagging grinder , or offhand grinder I am thinking.

[CreakyOne]

I found these black grinding wheels, they are 2.5 diameter, 3/4 wide, with a 3/8 hole. On one side it says Pacific Mos 14,520, on the other A46-P9-B03. Anybody know what these are? They came packaged in a group of four, strapped together with fiberglass tape.

Somebody must have had lots of these on hand, as there are about a dozen or more packages in this flea market find. If nothing else I can certainly spin one up and see what it will cut. It appears to me that the original use would have required changing them out on a regular basis. Maybe in the railroad industry, or mining perhaps-

It's an aluminum oxide, medium grit; the 14,520 is the Maximum [Operating] Speed its rated for. The composite number is a code for the grit, the bond type, etc, most of which I've forgotten. What does a google search show for that number? Look here:

https://www.aaabrasives.com/blog/pos...ng-wheel-spec/

BTW, why does everyone "change them out" nowadays? Why not "change them in"? Or, just "change them"...like we always used to do?

.

[toolznthings]

Could be replacement wheels for a diamond break dresser. For truing/dressing resin bond diamond wheels, such as surface grinder.

[reggie_obe]

Might be from Pacific Abrasives: http://pacabrasives.com/

[JoeLee]

I have an old Norton 7" x 1/2" that is black with a lot of sparkly crystals in it. It say Crystolon at the bottom of the blotter. If that tells you anything. 36 grit.
Not sure what Crystolon is..... probably some name they gave it. Usually silicon carbide is green, but they can make them any color they want.
I would have to research the number on it to see exactly what it is. I should so I'll know what it's for.

JL...................

[Illinoyance]

Crystolon is a Norton trade name for SiC.

[darryl]

Well I've searched for awhile and nothing comes up that matches these. I can have all I want for 37 cents each, but I'd have to have something in mind to use them otherwise they will just sit on my shelf for the next 20 yrs and then it will be my turn to get rid of them.

They would not likely be a substitute for any bench grinder wheel being only 2.5 inches diameter, and 3/4 inch wide seems too much for an angle grinder, although the speed rating suits an angle grinder. It can remain a mystery, though I still might mount one and see how well it works. A little desktop grinder might be handy.

[MattiJ]

Well I've searched for awhile and nothing comes up that matches these. I can have all I want for 37 cents each, but I'd have to have something in mind to use them otherwise they will just sit on my shelf for the next 20 yrs and then it will be my turn to get rid of them.

They would not likely be a substitute for any bench grinder wheel being only 2.5 inches diameter, and 3/4 inch wide seems too much for an angle grinder, although the speed rating suits an angle grinder. It can remain a mystery, though I still might mount one and see how well it works. A little desktop grinder might be handy.

As said they are probably for ”straight grinder” that was once common before angle grinder and still used for some speciality jobs.
Some beast like this: https://www.aptoolsltd.co.uk/air-too...3295100-detail

[CreakyOne]

Well I've searched for awhile and nothing comes up that matches these. I can have all I want for 37 cents each, but I'd have to have something in mind to use them otherwise they will just sit on my shelf for the next 20 yrs and then it will be my turn to get rid of them.

They would not likely be a substitute for any bench grinder wheel being only 2.5 inches diameter, and 3/4 inch wide seems too much for an angle grinder, although the speed rating suits an angle grinder. It can remain a mystery, though I still might mount one and see how well it works. A little desktop grinder might be handy.

They may have been sold and discontinued long before the internet so not found in a search of it. They may also have been manufactured for a specific company so not listed 'publicly', but being a tool, nothing says they needed to be used for a particular purpose on a specific tool.

I agree with MattiJ above that they would work well on a die grinder; would I prefer a Milwaukee tool like this:

If you did a lot of work deburring 4-6" tubing on the inside, it might be possible to build a 'long-arm' bench grinder using these wheels for that purpose; for anything larger, a die grinder would fit inside.

I know that if I had a few of those wheels, I'd find a good use for them. I doubt I could use a dozen or two since I'm not in production, repeating the same job frequently.

[reggie_obe]

Well I've searched for awhile and nothing comes up that matches these. I can have all I want for 37 cents each, but I'd have to have something in mind to use them otherwise they will just sit on my shelf for the next 20 yrs and then it will be my turn to get rid of them.

They would not likely be a substitute for any bench grinder wheel being only 2.5 inches diameter, and 3/4 inch wide seems too much for an angle grinder, although the speed rating suits an angle grinder. It can remain a mystery, though I still might mount one and see how well it works. A little desktop grinder might be handy.

Any else printed on the whel blotter? Were it me, I'd take a photo of the wheel and send it and the dimensions to Pacific to see if they can identify it. Maybe a discontinued or custom wheel as someone already stated.

[darryl]

I stated everything that was on the wheel. There is no other info.

I can assume it's an aluminum oxide, 46 grit. Looks right- I'm just not used to seeing that in black, but no matter. I'll probably pick up a few more since they are so cheap. If I use even one I'll have my moneys worth.

[sarge41]

They sound like wheels for grinding the welds on band saw blade welders. About the right size.

Sarge41