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Abrasives, Grinding Wheels and Machine Tools

Cutting and grinding wheels, sanding belts and discs, end mills and blasting cabinets for metalworking and finishing. 17 products from $1.19 to $714.99. Ali Indistries Inc, Tuff Stuff, SPEED TIGER and more.

17 products from $1.19

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Abrasive wheels: diameter, arbor, thickness and maximum speed

Abrasives and cutters make up most of this aisle, with a few machines such as blasting cabinets. Wheels and discs must match the tool in four ways: diameter, thickness, arbor (center hole) size and maximum speed. A 4-inch wheel with a 5/8-inch arbor fits a tool with a 5/8-inch spindle, and its rated speed in rpm must be above the tool's no-load speed, because an overspeed wheel can burst. Type 1 wheels are flat; thin ones cut, while thicker grinding wheels remove material but are not made to take side load. Always keep the guard supplied with the tool in place.

Grit, abrasive material and belt or disc size

Grit sets how aggressive an abrasive is: low numbers such as 36 to 60 remove stock fast, 80 to 120 smooth the surface, and higher numbers finish. Aluminum oxide is the general-purpose abrasive for steel and wood, and belts and discs are sized to their machine, for example a 3 by 18 inch belt or a 4-1/2 inch disc for an angle grinder. Carbide end mills cut hard metals but need rigid holding and the right speed. A blasting cabinet needs clean, dry compressed air and an abrasive suited to the finish.

Questions about Abrasives, Grinding Wheels and Machine Tools

Can I use a cutting wheel for grinding?
No. Thin cutting wheels are designed for forces along the cutting line and can shatter if you grind with the side or the face. Use a cutting wheel for cutting and a grinding wheel for grinding, each on the tool and guard it was rated for.
What does the arbor size on a wheel mean?
The arbor is the center hole. It must match the tool's spindle or flange, such as 5/8 inch, and the only safe way to change it is a bushing made for that wheel. A loose fit lets the wheel run off-center and vibrate.
How do I pick sanding belt grit?
Start coarse, around 36 to 60, for rapid stock removal or rust, then move to 80 to 120 to smooth the surface and finish with finer grits. Skipping steps leaves deeper scratches that the finer belt takes much longer to remove.