another grinding wheel recommendation

[Mcostello]

I have a grinding wheel that was made to swing a part holding fixture past the grinding wheel. The part holding fixture is counterbalanced with a weight on the bottom so that everything moves easily. This is from the time of lineshafts. What grinding wheel should I use for HSS? This setup will take a 12" wheel so I will hold the speed down below 2000 RPM. It has micrometer adjustments so that you can't jam the wheel( I hope). Thanks for any help.

[Thrud]

All the 12" grinders I have seen have 1725RPM max I would run your wheel slower than that unless you know for sure it can handle the speed.

If you are unsure - proceed with caution! Safety first!

Dave

[SGW]

Agree -- 2000 rpm on a 12" wheel would be galloping along at a pretty good clip. If you figure the classic "mile a minute" surface speed, you'd want about 1600 rpm. With 2000 rpm, you're up to almost 6300 surface feet per minute, which seems to me to be pretty high for a 12" wheel.

As far as what kind of wheel.... Personally, I'm partial to the "green grit" wheels designed for grinding carbide, even for HSS. They break down rapidly, but I find they grind cooler. My knowledge of types of grinding wheels is pretty limited though. Probably somebody can recommend a more "correct" wheel for HSS.

Now, are you talking about grinding on the side of the wheel with this swing-past gizmo? If so, you'll want a cup wheel.

[Mcostello]

yes I will be grinding on the side of the wheel. I was thinking of a plate mounted wheel, with an adapter in the middle held on with 3 bolts screwed into the faceplate to match what appears to be origional setup.Glad to have imput on speed as I didn't check out- just went with a figure in a catalog, not good.

[Thrud]

The plate mounted wheel is the correct one to use, grinding on the side of your wheel is a no-no. An open structure soft bond wheel (Norton "H") is the best choice for Aluminum oxide. CBN (Cubic Boron Nitride - Norton "Norbide") works the best but anything you grind has to be above 38-45 on the Rockwell "C" scale or it will wear like you would not beleave! If you intend to tackle the tougher alloys such as M-42 or T-15 or the special sintered metalurgical powder alloys CBN is the way to go. Diamond has an affinity for the Carbon in steels and is generelly only used with carbides and ceramics. I am aware of synthetic Ruby wheels (ceramic) - they are supposed to be good for T-15 and exotics but I have not tried them (yet).

Modern crankshafts are forged, hardened, roughed out with tough ceramics and finish turned with CBN (COOL!) instead of ginding.

This grinder you have sounds like a Punch & Die grinder.

Dave

[Mcostello]

This machine seems to be a horizontal shaft surface grinder. It seems to be made to hold a small part against a stop then pivot the whole assembly past the face of the wheel. Theres a big counterweight,very adjustable, on the bottom that makes the whole thing pivot almost effortlessly.Has a screw down cap for grease lubrication. Micrometer dials also present, two faceplates with tee slots and protractors. Powered origionally by lineshaft. Checked catalog again 12" wheels rated for 2000 RPM, sounds too scary for me. What would be nomenclature or part # for a generic grinding wheel or an inexpensive place to buy from ? Cadillac dreams shoeleather budget. THANKS,Mark

[Thrud]

Try MSC or Travers or KBC

Good Luck
Dave

[Koloya]

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12/18/04

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