Originally Posted by
Yannis
Just calculated:
All my razors have an angle from 14 degrees minimum( bengall, Dorko for barber use) to 16 degrees maximum (dorko stainless, Henkels friodur- new, henckels made-) with the majority of others between 15 and 16
Lets go with an example:
A razor with 6mm spine width and 21 mm blade ( Dorko Stainless) has 16 deg angle.
If you hone it without tape 3mm then you have 19 deg angle
To remain 16 deg you need a spine of 5,6 mm , a spine wear of 0,2 mm in width on each side.
If you hone with tape another 1mm you have 20 deg angle.
The spine of the razors is so designed to obtain in aproximation the wear needed to maintain the angle.
Spine wear must be proportional with the width of the bevel
On new razors the spine wear surface is minimal because the bevel width is minimal.
So if after time the bevel width (the surface who touch the hone) is larger and you need more honing and the spine wear surface becomes larger to compensate this.
This is easier to observe on wedges