Thread: Chipping after shaving HRC issues? Custom Razors

This is the Google box calculation


(2 * asin(.181 / (2 * .620)) * 180) / pi = 16.786646


The red is the width of the spine the green is the height of the blade from where it touches on the hone... plug that into Google search and voila Math !!!


or let's just plug in your 6/8 calc figuring the height at .740 rather than .750 for the full 6/8 height...


(2 * asin(.188 / (2 * .740)) * 180) / pi =14.5956583

This is about 1.5° low from the accepted 16° target / average we found on Vintage razors, some razors target 17°

At 6/8 each layer of tape adds about .66° to the measurement so you need 3-4 layers to bring it into spec... HT Temper and Steel can absorb some of the variance but building razors to accepted spec makes life easier


This is why we are known around the internet as "Know it Alls" on SRP


ps: I only checked the 6/8 size you can play with the others and see where they come in at

Originally Posted by gssixgun

This is the Google box calculation


(2 * asin(.181 / (2 * .620)) * 180) / pi = 16.786646


The red is the width of the spine the green is the height of the blade from where it touches on the hone... plug that into Google search and voila Math !!!


or let's just plug in your 6/8 calc figuring the height at .740 rather than .750 for the full 6/8 height...


(2 * asin(.188 / (2 * .740)) * 180) / pi =14.5956583

This is about 1.5° low from the accepted 16° target / average we found on Vintage razors, some razors target 17°

At 6/8 each layer of tape adds about .66° to the measurement so you need 3-4 layers to bring it into spec... HT Temper and Steel can absorb some of the variance but building razors to accepted spec makes life easier


This is why we are known around the internet as "Know it Alls" on SRP


ps: I only checked the 6/8 size you can play with the others and see where they come in at

I don't take someone educating me as someone acting as a know it all... I am always open to anyone's suggestions as I wasn't born with all the knowledge on how to make razors, so educate away

On another note I'll have to wait for my math queen to come home and teach me what ur showing me �� Never been the best at math

How are you heat treating your blades? The reason I ask is that I have a digitally controlled electric kiln and I added a thermocouple temp probe and was shocked be the temp variation on the screen, it was 20 c off where the razors were sitting so I now have temp probes measuring in three different zones just to be sure. Also 1550f seems way to high for 01 that's about 843c and if your probe is off it could be way higher, I harden my blades at 805c for example.
Also have you snapped one of you blades or a test piece to have a look at the grain structure? That helped me a lot because I realised that something was off as I was getting chipping etc, so started looking at my heat treating procedure which once I mastered sorted it out.
Also another consideration is your tempering has to be spot on again you need precise temp control.
And as for blade angle I have found that it needs to be above 16 degrees or the edge can be too thin ,believe it or not some of my best shavers have been at 18-19 degrees.
Hope this helps a bit.
Ps there is a great bevel angle calculator on www.coticule.be it helped me tremendously as you can plan in advance how high your grind should be with the thickness of stock you are using for example everyone thinks that 1/4" stock is great for 8/8" but if you grind right up to the spine you are at around 14.3 degrees without tape which is no good and who wants to use 3-4 layers every time they hone not me!
Edward Brice