Bowing in H.T.

[redsquid2]

I send all my blades out for H.T. I had one in .093" thick 154CM that came back bowed, from end to end. Was this a function of how long/skinny it was? It was a wharncliffe, so it was relatively skinny in relation to length.

I have the edges at .013" when I send them out. So far, this is the only one that has bowed or deformed. It is also one of the few that I have done in .093". Everything else has been thicker.

 

[LRB]

Heat treater did not do his job. Contact him to send it back. You did nothing wrong.

 

[Robert Dark]

Yup, its gonna bow from time to time due to several factors. I have limited experience with sending stainless blades out, and have only used BOS. Everything always comes back straight as a string, in spite of my grinding techniques.

Paul Bos and Paul Fariner (SP?) both told me that many makers who make blades under .060 - .090" will do grinding "Post-heat-treat". This helps to eliminate stress bends. Works well with sharp belts, cools between passes, and even better with a variable speed grinder.

Robert

 

[redsquid2]

I don't have a grinder; just files and sandpaper/ sanding blocks. I think I am going to stick with .109 = 7/64th's, and that will be my "thin" stock for now.

 

[LRB]

In the eighties I made a few with 1/16" blades of ATS-34, and 440-C, and sent them to Bos for HT. They were flat ground to finished size. They always came back as straight as they left. Bos told me that if I wanted, I could even put an edge on them. I repeat. Send it back to be corrected.

 

[redsquid2]

It was a couple of months ago. I straightened it out and finished it.

O.A.L. 5 1/2"
Tip to Scales: 2 3/4"
Cutting Edge: 2 1/4"
Combined Weight, Knife and Sheath: 2.5 oz.