cpm s90v question

D

DREW78

Joined
Feb 23, 2006
Messages
755
Hey all.

I recently got a new fixed blade of the knife makers sub forum. It's in cpm s90v steel and is at 62-63rc. .09" stock.

Cuts like a demon so far.

so my question is does this steel hold a razor edge for very long or more like a working edge?

What kind of edge angle will this steel tolerate for an edc knife?
 
Mines holding just fine at 160,000 grit @ 12.5 dps>
Spyderco / Phil Wilson Southfork

Takes best to diamonds/CBN though
 
I finish my S90V with a coarse DMT stone and a strop with diamond compound (1 micron).
 
I've got a KME system. Basically a guided clamp. I have diamond stones to 1000 grit, then use a translucent Arkansas stone, then a strop with cbn at 4 microns.

This set up has produced some very good results on everything from 1084 to M390. I've never had a high Vanadium steel like this before hence my questions.

Thanks to all.
 
I don't know how well the Arkansas stone will work on s90. For sharpening my Benchmade s90 steel I use DMT diamond hones and diamond paste on my strop. I started to sharpen it with waterstones but it was taking forever so I moved to the diamonds. From my use it holds an sharp edge for a long time with no huge drop off to "working edge" like I see with some other steels like s30.
 
DREW78 said:
I've got a KME system. Basically a guided clamp. I have diamond stones to 1000 grit, then use a translucent Arkansas stone, then a strop with cbn at 4 microns.

This set up has produced some very good results on everything from 1084 to M390. I've never had a high Vanadium steel like this before hence my questions.

Thanks to all.
Click to expand...

Chances are, the translucent Arkansas stone would do little more than breaking off burrs or other weakened remnants at the edge, on S90V. I've used a black hard Arkansas pocket stone similarly on steels like VG-10, and it can be somewhat effective at 'flipping' burrs and gradually burnishing them away. Beyond that, it won't really remove much metal or alter the scratch pattern on something like S90V; your 4µ CBN on the strop afterward would likely dominate or erase anything done by the Arkansas, in terms of refinement or polish. At polishing grit levels, the vanadium carbides in the steel will greatly limit the effectiveness of the novaculite in the Arkansas, which is much less hard than the carbides themselves. You could likely skip the Arkansas altogether, and use the 4µ CBN (or similar-grit diamond) on a hard strop like wood, or paper over a smooth stone or glass, and get as-good or better results on S90V.


David
 
Skip the arkie. David went over why pretty throughly up above.

When finishing on diamonds make extremely light edge leading strokes on your final passes , and eventually make extremely light alternating edge leading strokes for a burr free edge. This will leave you with a coarse edge that is very clean. To squeeze some more out of it go straight to the 4u cbn on roo. Make a handfull of light passes. This wont remove the diamond scratches ,more so just clean things up a bit more , clean up in between the peaks and valleys so to speak.
 
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