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Reply by REO

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Posted on Carbide vs. HSS tools

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REO

929 posts in 2952 days


#1 posted 09-12-2016 12:56 AM

I have to disagree with the notion that carbide cant get as sharp as HSS. The sharpness is not a function of the grain structure of the medium but the grain size of the abrasive sharpening it. how sharp does one need to be is sharper always better or is sharp enough enough. micro chips are caused by heat created by friction at the edge during sharpening. I know it seems to be “common knowledge” but is not true. It is true that most carbide tools sold for turning are ground as scrapers. So they are used as such. if you get an insert ground with a “bevel” or relief it can be used in the exact same way as a bowl or spindle gouge. lookup the nomenclature for the way a carbide insert is determined. Here is a table: http://www.carbidedepot.com/formulas-insert-d.htm carbide can give similar results to traditional HSS tools provided the edge is presented similarly. here is a video of a carbide insert used in kiln dried ash certainly not presented as a scraper.

https://youtu.be/GwTwU9FNb4M?list=PLBBq08qeZUqxql3YiXj3ubUaa0rDLhUVS


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