Messing with Macro Photos

[Gator97]

Yesterday I had a chance to test hardness for 2 knives. BM 710 HSSR and Tadatsuna Kamagata Usuba.

Sadly M2 on 710 tested 58.8HRC, which is 1.2 pt below advertised 60-62HRC.
Tadatsuna was 62.3HRC.

Here's ~80x-100x pictures of the marks left by RC tester diamond:
Two test marks on 710 blade, near the pivot area.


Single test mark on Tadatsuna blade.


While doing all that I managed to drop the blade on the concrete floor, here is the result ~ 60-70x magnification:



And finally while doing macro pix and experimenting with depth of field combo pix I took closeup of the thumbstud on the 710. 5 overlapped/combined pix resulted in this:

 

[ROBB]

Great pic's.:thumbup:

 

[Reeek]

Awesome job - things sure are prettier to the naked eye than under that magnification, The thumbstud looks hard rid

 

[Gator97]

Yeah I removed it only once and look at the hex..The rest, well it's been in my pocket for 7-8 years.

 

[knarfeng]

It does seem a bit low, but it is worth remembering that Rockwell testers are only calibrated to ±1, so that reading of 58.8 means the hardness could be 59.8.

 

[Gator97]

I would hope so. The thing is that knife doesn't hold the edge nearly as well as 60HRC Lochsa. I started with 12 deg. per side and now I am up to 20 per side to have acceptable edge holding. And if it's -1 then the knife could be 57.8