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Posted by john on July 19, 2008, 3:35 pm
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Ignoramus2031 wrote:
>
>>
>>
>>>What do you use to grind lathe bits (carbide ends or HSS) and is 1/3
>>>HP grinder enough. thanks
>>
>>
>>It is enough.
>>
>>Green wheels will grind carbide but I sure don't like the looks of result. A
diamond
>>wheel is SOOOO much better. DO NOT USE FOR STEEL.
>>
>>Steel, aluminum oxide. I tried to grind HSS using the green wheels on my
Harbor Fright
>>tool grinder, sloooow.
>>
>>The way you shop auctions, I expect to see you with a baldor tool grinder you
got for a
>>song.
>>
>>Sure wish Harrold would come back to the group.
>
>
> Wes, I come across baldor tool grinders all the time and sold a few
> already. Another one will come up one day. That all should not be a
> problem. For now, I will mount a diamond wheel on a regular bench
> grinder, it will save some space and should be OK.
>
> But here's where I am confused: a lot of lathe bits with carbide ends,
> have carbide brazed to steel shanks. Can I grind that with a diamond
> grinder or not? Steel will definitely be ground along with carbide.
>
You do not want the HSS blank to be ground on the diamond wheel. the
way I have always done it with brazed carbide tooling is to rough grind
the HSS relief then rough grind the carbide to the approximate shape
putting enough relief on the carbid to be able to finish only the top
half of the edge of the carbide without touching the HSS with the
diamond wheel. Remember not to heat the carbide up too much or the
braze will melt. Same goes for when you are cutting.
John
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