The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details:
https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is $300 $250 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
The issue can be that if gone over the temper then it can leave splotches in a etched or polished finish even if it doesn’t effect the integrity of the blade, it’s very hard to tell what temp the torch is getting the piece to and if you over shot the temper. For a pro service I have and would avoid it, it’s the biggest reason when I first started that I didn’t send any blades to a certain company in the heat treating industry.Heating below the tempering temperature does seem to help reduce the risk of cracking when straightening warps. I see no risk to pro's doing it that way.
Not from a pro service for me. I can do that at home, if I’m paying good money for the service I want better.
LOL. A lifetime ago (1979) I made a first knife. I was working in a machine shop that had a HT oven and everything else I needed. I got to the point, per Boye’s book where you heat to anneal the spine .. only thing was that the only torch the shop had was an oxyacetylene rig. Talk about overheat ... I melted a spot on the spine :-( . THAT little knife never got a handle! (Though I did keep it around for a long time, and used it occasionally.When I say torch, I mean plumbing torch, not acetylene, and when I say heat, I mean no oxide colors, not blue, etc.
This is my current procedure as well. I added the stress relieving first temper after my second blade went 'tink' 15 minutes into the 1st tempering with shims.The first temper cycle is warps and all to relive stresses. Corrections start with the second temper.
I can only imagine. I ran into the space issue the last time I HT'd 3 chef's knives and all of them had a warp. I didn't have enough clamps, angle iron or room to straighten all three at the same time. The clamps and straightening jigs would be an easy fix, but I'm pretty sure getting a bigger oven is out of the question.One issue we have is shear volume and size of ovens. To clamp and shim every blade during tempering you would have to have more paid help and a crap ton more ovens. We all ready have 3 dedicated tempering ovens.