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Old 02-05-2007, 10:14 PM
 
Join Date: Nov 2006
Location: u.s.
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longcut is on a distinguished road
Problems grinding hasteloy c

Any suggestions on wheel type and bond? I'm using a B&S #1 ID/OD grinder to remove .005 of material and the wheel (14") keeps loading up and screaming. Talked to Norton and they say you have to push it harder. Any harder and I'll be pushing the freakin' sleeve off the mandrel Tried thinning the wheel surface down, but still end up dressing before each piece. Any help would be appreciated.
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Old 02-06-2007, 12:22 PM
 
Join Date: Dec 2005
Location: USA
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NC Cams is on a distinguished road

We ran into similar problems grinding Wahl-Colmonoy hard face welding material (chromium/nickle/boride plus silicon and some other stuff for good measure). Real wierd stuff to grind/cut/finish the way the clients wanted it done (like a mirror with NO cracking or checking).

We used an aluminum oxide wheel comprised of a combination of white and red/ruby vitreos materials. ALthough 60 and 80 grit will cut it, a 46 grit did a much better job of roughing and semi-finishing. In our case, we had to experiment a bit with stone hardness to get the stuff to cut and/or hold dress. So called "open" (induced porosity) wheels were useless as they didn't hold dress and the material gobbled up the wheels (wore the wheels concave).

We've since moved on to some other materials but we did some work with 80 grit silicon carbide wheels to finish grind the parts along the way. These did much nicer finishing but we had much faster material removal rates with the 46 grit aluminum oxide wheels. We found that coolants made a huge difference in cut and finish as well. Valenite VNT700 was hands down the best stuff we tried.

Depending on the desired finish, I'd plan for two grinding stages (roughing then finishing). Each stage required "custom" wheels in our situation.

The guys at Radiac/US Diamond helped us thru our stone selection and development processes - ask for Jay @ 800-323-0727 ext 174 and tell him NC Cams sent you.
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Old 02-06-2007, 09:47 PM
 
Join Date: Nov 2006
Location: u.s.
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longcut is on a distinguished road
Thanks.....

I'll give them a call. I agree with the coolant, because I put the wheel under a microscope and it looked like was grinding solder Packed in. Anyway I have a part time thing going and I also grind VR1 fiberglass and the resin sludges things up to the point I spend have my life cleaning up the junk let a lone filtration and losing good coolant. Thanks again.
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