Models for grinding HSS Lathe Tools

If you have an M42 bit, and use it on a lesser material than it was designed for, will that make a difference in the performance of the bit?
 
In my mind, I have been working on an assumption, but never asked the question.
 
Aukai said:
If you have an M42 bit, and use it on a lesser material than it was designed for, will that make a difference in the performance of the bit?
Click to expand...

No, there is no performance difference.
 
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Good to know I got away with an "assuming" :)
 
Mikey et al,
Here is the tool intended for cutting ebonite and other soft materials, per our discussion in posts 1503 and 1504. 15 deg side and end relief, 17-18 deg back rake, and 20 deg side rake. Took awhile to remove all the rake material. The shining at the edges is from honing flat vs the curved grinding wheel. Yes there is one facet in the northwest corner of the top, but I didn't want to risk the rest of the cut to clean that off. And yes there are a couple of nicks on the edges behind the top. They annoyed me too, my bad.
It's incredibly sharp.
I'll try to take a test cut this tomorrow.
Curious about your and others' thoughts.

Tim

20210224_162101.jpg20210224_162041.jpg20210224_162045.jpg20210224_162036.jpg20210224_162033.jpg
 
Proof is in the pudding, Tim. Cut with it and you tell us. The tool itself looks good.
 
Tim, I forgot to mention that you need to put a small nose radius on this tool.

It is clear that something has happened to greatly improve your tool grinding. I think you mentioned the grinding wheel might have helped a lot but whatever it is, you have come a long way, Sir!
 
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