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Old 04-21-2010, 01:23 AM   #1
IronHorse
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Default Sharpening Carbide Bits

I picked up a "green" wheel for my grinder. I want to resharpen some of my Carbide tipped lathe bits. My question is, do you "dip" these type of bits in water like you do for HSS or let them air cool?

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Old 04-21-2010, 02:06 AM   #2
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Default Re: Sharpening Carbide Bits

Hi Ironhorse;

When I sharpen my Carbide bits the first thing I do is to grind the under side with a regular wheel and then grind the carbide with the green wheel.

Yes I always dip the tool in water (not to cold).

A good rule is to hold the tool close to the end being ground and when your fingers start to get hot it is time to dip in water.

Richard


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Old 04-21-2010, 03:32 AM   #3
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Default Re: Sharpening Carbide Bits

Are you are referring to brazed carbide bits, such as this turning tool and boring bar
from my tool box?



If that is the case you HAVE to keep them cool!
Heat from grinding build up quicker than we would expect.
That heat can become high enough to weaken the brazed bond between the
carbide and the tool.

Grind a little and quench it, grind a little and quench it...

If you are referring to solid carbide tools, grind them until you are happy with
the result and let them air cool.

Rick

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Old 04-21-2010, 05:19 AM   #4
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Default Re: Sharpening Carbide Bits

IH,

This is very basic stuff, but a reminder in case anyone doesn't know about it.

When grinding carbide tools, either by hand or machine, you only ever grind up or down on the cutting faces, NEVER across.

If you grind or lap across the face, you will find that the carbide will de-laminate and chip very easily when cutting.


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Old 04-21-2010, 12:44 PM   #5
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Default Re: Sharpening Carbide Bits

thanks guys for the info.

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Old 10-24-2010, 08:51 PM   #6
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Default Re: Sharpening Carbide Bits

If you don’t like the hassle and mess of a green wheel you could try this.
https://sites.google.com/site/davisd...b/Products/dch
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Old 10-24-2010, 10:41 PM   #7
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Default Re: Sharpening Carbide Bits

A very timely thread. I bought a green wheel last week to sharpen my carbides, and haven't used it yet.----Brian
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Old 10-25-2010, 12:00 AM   #8
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Default Re: Sharpening Carbide Bits

Quote:
Originally Posted by Pat J
I found this PDF a while back on this site, and it mentions the hazards of breathing carbide dust.

Be careful about the fumes, vapors, dust, etc. in a confined shop area.
You never know if or how that stuff will affect you.

It may affect some and not others, but it is not worth the gamble.
Protect yourself, don't risk it.

Pat J
I think just about everything we do now days is bad for us.. The grinding wheel it's self is hazardous to breath, maybe all these years of grinding with an aluminum oxide wheel has given me alzheimer's. I forget things often..
maybe all these years of grinding with an aluminum oxide wheel has given me alzheimer's. I forget things often..

PS sorry about the above post I put it in the for sale section, I was warned…



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Old 10-25-2010, 02:51 PM   #9
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Default Re: Sharpening Carbide Bits

Hi Guys,
I seem to recall that one should not quench carbide when grinding, for the same reason that you should either use flood cooling or none at all when turning with carbide tools to prevent cracking. Am I wrong, again?
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Old 10-25-2010, 05:10 PM   #10
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Default Re: Sharpening Carbide Bits

Quote:
Originally Posted by Ned Ludd
Hi Guys,
I seem to recall that one should not quench carbide when grinding, for the same reason that you should either use flood cooling or none at all when turning with carbide tools to prevent cracking. Am I wrong, again?
Ned
You are correct you can cause premature failure even if you don't see the cracks in the carbide. The best thing is to cool with just an air gun cracks will form from thermal shock otherwise.


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