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Post by davidc on Jan 29, 2008 8:10:15 GMT
Any S/H machinery dealers where I might find a nice old 7 or 8 inch high speed bench grinder please?
I don't even know the names of good old ones to search for...
Not impressed with APTC Creusen "Professional" model.
Vibration due to poorly machined washers, and nasty thin sheet metal tool rests.
One lives in hope, but is so often disapointed
David Charlesworth
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Post by jake on Jan 29, 2008 11:46:36 GMT
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Post by jake on Jan 31, 2008 18:51:22 GMT
That's a pleasure, glad you found it useful.
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Post by engineerone on Jan 31, 2008 20:25:34 GMT
might be worth looking in Model engineer for some contacts too dc, most of those are metal working ones, so they are generally of higher speed. paul  |
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Post by jake on Jan 31, 2008 23:09:09 GMT
Higher speed, Paul?
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pj
Junior Member
Posts: 88 
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Post by pj on Jan 31, 2008 23:31:30 GMT
Union made good double ended grinders but I think in 10 and 12" only and you will struggle to get aluminum oxide wheels to fit them, if that what you want. May be a better solution to have a engineering firm turn washers from bar and dis guard originals. Turned ones will be better balanced so then your just left with the wheel balance, which on a buff, is not normally adjustable.
Chuck guides and replace with Axminster/Lee Valley versions and mount on a plinth filled with sand to kill vibration.
Just my thoughts.
Philip
Ps. You can get badly out of balance wheels, which are normally non branded ones, but if you stick to Norton/Universal wheels it shouldn't be a problem.
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Post by engineerone on Feb 1, 2008 0:33:41 GMT
jake i am not sure about the essence of your question about speed. based on what i have available to me now, latest woodworking grinders are relatively low speed, up to i think 5000 rpm. but with smallish wheels. some metal ones i think run up to about 7000 paul |
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Post by jake on Feb 1, 2008 11:39:22 GMT
My thought process is that they would be induction motors, they aren't geared, leaving peripheral rim speed as the only real variable (unless, like the Creusen slow speed ones, you go to a four pole motor). The wheel-size has been specified, so it's just a matter of tracking one down. Maybe that's wrong?
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Post by engineerone on Feb 1, 2008 11:51:03 GMT
jake maybe i got confused, dc mentioned old, so i immediately thought of poled motors rather than induction, since we have probably not made them in the uk for at least 20 years, can't see them being induction. ;D paul |
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Post by jake on Feb 1, 2008 13:06:35 GMT
Could be I'm assuming wrong, but induction motors aren't exactly newfangled, and those are old but high quality kit - the dealer would know.
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