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+---- Thread: Grinding tool bits (/thread-2744.html)
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Grinding tool bits - RandaB - 06-26-2015
This is probably quite a daft question, but is it possible to grind down a tool bit using a diamond-coated slitting disk rather than a grinder (In a high-speed minidrill)? This is for a very fine groove to be made in a bit, which a grinder won't make very well (Or at least, what we've got!).
Jason
RE: Grinding tool bits - DaveH - 06-26-2015
Jason,
Anything is possible (except my welding
).The material of the tool bit needs to be considered - if it has carbon in it (most steels), it is not a good idea to use a diamond disc.
If the bit is (say) tungsten carbide then a diamond disc will be fine.
DaveH
RE: Grinding tool bits - RandaB - 06-26-2015
That's interesting. I didn't know about diamond coated disks and carbon. I've mainly used mine for brass, copper, aluminium and several plastics, mostly HDPE.
RE: Grinding tool bits - dallen - 06-26-2015
why wouldn't you grind HSS on a diamond wheel
RE: Grinding tool bits - DaveH - 06-26-2015
(06-26-2015, 05:24 PM)dallen Wrote: why wouldn't you grind HSS on a diamond wheel
Because it has carbon in it and the carbon reacts with the diamond(s) and blunts them.
DaveH
RE: Grinding tool bits - DaveH - 06-26-2015
This is from https://www.georgiagrindingwheel.com/grindingwheels_basics.htm
[b]Diamond wheel on steels and CBN on carbides?
Quote:We get asked quite frequently if a diamond wheel can be used on steels and CBN on carbides. We do not recommend this as the wheel life will be greatly reduced and in some cases, the wheels may not even cut at all. A diamond wheel is specifically used for carbides, plastics and other synthetic materials. It will not grind steel well at all. CBN wheels should only be used on steels. There is a hybrid grit available that will grind both; However, it is a compromise in wheel life and grind-ability. But in cases where you must grind both materials at the same time, it can be a real time saver.
DaveH
RE: Grinding tool bits - stevec - 06-26-2015
Dave's right, just ask Harold the 5th
on that other forum. 
Steve
RE: Grinding tool bits - dallen - 06-26-2015
learn something new everyday
BUT for what RandaB is wanting to do, it may be the only way he can accomplish what he wants to grind.
RE: Grinding tool bits - DaveH - 06-26-2015
(06-26-2015, 05:53 PM)dallen Wrote: BUT for what RandaB is wanting to do, it may be the only way he can accomplish what he wants to grind.
May be, depends on the tool bit material. If it is HSS there are better ways.
DaveH
RE: Grinding tool bits - stevec - 06-26-2015
dallen, Right on! whatever works for you (or me
).Steve