Thread: Edge life vrs razor geometry

Originally Posted by mattnat

Perfect, would you just use the max width of the tang as starting width?
Does kapcom tape resist Wear better than 3m electric?

Yes. Typically there's no hone wear at the shoulder of the spine. That's what I go by.

But you'll get the idea of how much tape and were to put on, just by working with different razors all the time.

General rules of thumb with Tape

Target angle of SRs is 16-17° going back hundreds of years

a 6/8 razor using 1 layer of 3M 700 tape increases the Bevel angle .67° (less than 1 degree) smaller razor more change...

Spine Wear 0-1mm use 1 layer of 3M 700
Spine Wear 1-2mm use 2 layers
Spine Wear 2-3mm Use 3 layers

After 3 layers it can get kinda squishy while honing so make sure the razor is worth the trouble

You CANNOT add steel to the spine (Yes there is a thread on here where I added a new Brass Frameback Spine to a razor) so even if you re-grind the razor you CANNOT change the final geometry with out making the blade smaller.. Math Sucks sometimes

Bevel angle the easy way

Spine thickness/active width X 57.3 degrees = _X_ degrees. remember "Active" width is from edge to where the spine touches the hone

The Magic Marker test is your friend, color the edge of an unknown razor, hone 2-3 strokes see what the hone is touching and what the bevel looks like...