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sharpening carbide cutters (Read 253 times)
 
Bruce Kamp
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sharpening carbide cutters
Aug 31st, 2017 at 9:20pm
 
What has been your experience with sharpening the cutters on carbide lathe tools?
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John Grace
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Re: sharpening carbide cutters
Reply #1 - Sep 1st, 2017 at 5:36am
 
Lay them 'face down' on a diamond hone and slide the cutter eight to ten times.  My experience is that this will 'freshen' up the cutter but not bring it back to factory sharpness.
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Ed Weber
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Re: sharpening carbide cutters
Reply #2 - Sep 1st, 2017 at 8:34am
 
John Grace wrote on Sep 1st, 2017 at 5:36am:
Lay them 'face down' on a diamond hone and slide the cutter eight to ten times.  My experience is that this will 'freshen' up the cutter but not bring it back to factory sharpness.


Agreed, this is because honing the back does nothing more than smooth and clean one face of the cutting edge.
You need a jig or holding device and a diamond abrasive sharpening system of some type to properly resharpen the original grind. This is why they are considered to be disposable cutting tips.
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Chris Neilan
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Re: sharpening carbide cutters
Reply #3 - Sep 2nd, 2017 at 9:00am
 
Use a lapping oil when you do this. Easier on your diamond card.
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Bill Moschler
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Re: sharpening carbide cutters
Reply #4 - Sep 2nd, 2017 at 9:37am
 
My experience on carbide lathe tools and on router cutters is that  cannot accomplish much even with a good diamond hone and I ruined the hone too boot.
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Ed Weber
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Re: sharpening carbide cutters
Reply #5 - Sep 2nd, 2017 at 11:51am
 
Bill Moschler wrote on Sep 2nd, 2017 at 9:37am:
My experience on carbide lathe tools and on router cutters is that  cannot accomplish much even with a good diamond hone and I ruined the hone too boot.


To expand a little,
Only polishing (honing) the back, you are addressing one side of the cutting edge.
You may smooth out a burr or two but you would have to remove material along the entire back side to have any impact on the cutting edge.
If you don't or can't address the actual grind (bevel) there is no way you can effectively sharpen.
When you sharpen a standard bench chisel, you sharpen the grind, then hone or flatten the back.
This situation is the exact opposite.
If I wanted to sharpen my chisel by only trying to hone the back side, I would never be able to sharpen it.

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