I have had pretty good luck so far plate quenching (1" aluminum) CPM 154, but just recently had some bad luck. I did two blades per batch last night and tonight. One blade came out fully hard, and the other came out a few points low. This happened both nights. Can anyone help. Here is what I did:
-My usualy HT recipe, blades wrapped in foil.
-Pull out, quench in between aluminum plates, shoot compressed air in between plates
-I started cooling my plates in ice water (towel dry) before and in between quenches.
-After the first night, I put slightly thinner shims on the bottom plate to prevent rocking of top plate.
The first night, the second blade came out harder (it was only profiled though). Tonight, I am not sure which one came out harder because they were exactly the same and had bevels ground.
Any ideas????
-My usualy HT recipe, blades wrapped in foil.
-Pull out, quench in between aluminum plates, shoot compressed air in between plates
-I started cooling my plates in ice water (towel dry) before and in between quenches.
-After the first night, I put slightly thinner shims on the bottom plate to prevent rocking of top plate.
The first night, the second blade came out harder (it was only profiled though). Tonight, I am not sure which one came out harder because they were exactly the same and had bevels ground.
Any ideas????