I used one of these to cut glass attached to a thin steel frame with gray VHB foam tape. Works well enough even with the bit set at 40psi to protect the glass. It runs through a wide band in which the razor blade is tightened by friction. The blade will probably work with much harder/denser materials (RTV silicone/urethane rubbers I think) as I accidentally cut pieces of sheet steel more than once. air chisel and blade. The blade is flexible, but the more you bend, the more of each stroke is used to bend the blade instead of cutting. Ideally, when working, everything should be in a straight line.
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