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Surfacing

Chris Cramer

Chris Cramer

Super User
For the pair of shears I'm working on, I'm trying to find the best technique to level both blades flush with each other for them to cut properly. I tried using my forge and my 20 ton hydraulic press but the surface is not left flat. I do have a backing plate attached to my belt grinder but that requires me to run the blade across the belt horizontally which is hard to get even, and I don't have a surface grinder.
 
I would suggest using a milling machine. I resharpened and faced the shear cutting edges on my ironworker in the mill.
High speed steel needs a carbide tool, and cut slowly.
 
I'm no expert, but I don't think they are planar flat. I've mistakenly misinterpreted slight air gap as bent, but I think that is a prerequisite.

go to about 2:40


about 3:30
 
PeterT said:
I'm no expert, but I don't think they are planar flat. I've mistakenly misinterpreted slight air gap as bent, but I think that is a prerequisite.
Click to expand...

I'm no expert either, but I agree. Even my best scissors have very slight arc in both blades. But the ground shear edge is straight.
 
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