This was another project that sat on one of my benches for probably 20 years. Finally got around to finishing it. My plans are to use it for cutting gasket material and thin plastic and maybe brass shim stock.
A while back I ground both surfaces of each blade. They was some rust and staining. SG cleaned both of them right up. Probably removed about .015 from each, ground them together.
The starting edge of the handle blade is worn pretty bad towards the top where it first meets the lower blade. No way I could grind all that out so I have to live with it.
The starting edge of the lower blade edge where it first contacts the handle blade was worn in about .030 in about 2" down. The result was it wouldn't shear a straight line.
So, the other day I milled the edge of the lower blade straight and finished it up on the grinder. Removed about .032 of the edge in all.
In testing this thing out sometimes it doesn't want to cut at the top edge and sort of folds the paper over, unless I chop it fast.
The lower blade is already showing some signs of a burr forming on the edge from the few times I've played with it.. The edge is ground square and I'm wondering if I should grind a slight relief angle in it?
The handle blade is set at about a 3 deg. angle as shown.
Originally, the edge of the lower blade was just sheared, never ground, it looked like it was tapered but I believe that was just the way the shear cut it.
Any ideas here??
JL....................


JL...........
A while back I ground both surfaces of each blade. They was some rust and staining. SG cleaned both of them right up. Probably removed about .015 from each, ground them together.
The starting edge of the handle blade is worn pretty bad towards the top where it first meets the lower blade. No way I could grind all that out so I have to live with it.
The starting edge of the lower blade edge where it first contacts the handle blade was worn in about .030 in about 2" down. The result was it wouldn't shear a straight line.
So, the other day I milled the edge of the lower blade straight and finished it up on the grinder. Removed about .032 of the edge in all.
In testing this thing out sometimes it doesn't want to cut at the top edge and sort of folds the paper over, unless I chop it fast.
The lower blade is already showing some signs of a burr forming on the edge from the few times I've played with it.. The edge is ground square and I'm wondering if I should grind a slight relief angle in it?
The handle blade is set at about a 3 deg. angle as shown.
Originally, the edge of the lower blade was just sheared, never ground, it looked like it was tapered but I believe that was just the way the shear cut it.
Any ideas here??
JL....................
JL...........
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