Posted 13 December 2016 - 06:00 AM
Posted 13 December 2016 - 06:01 AM
Posted 20 December 2016 - 05:57 PM
On my punches, I chose to use a low shear angle so the center of the punch fully penetrates the material at the blank center just as the ends of the punch touch the surface. The cut is from the center out. You could reverse it and cut from the ends in.
Clever design of bench shear blades could probably be optimized for the hard reed material.
Posted 21 December 2016 - 02:01 AM
Posted 22 December 2016 - 02:57 PM
Posted 22 December 2016 - 03:10 PM
Posted 22 December 2016 - 03:59 PM
That kind of shear blade is shaped to maintain the same shear angle from beginning to end. It is optimized for relatively soft material like mild steel. Those shears can cut through quite thick stock. On reed steel thicknesses, you could still cut easily with a much shallower curve. I am not sure, but I believe it is a exponential curve ( constant angle spiral ). If you scaled it by 2, it would be better suited to hard steels even though you couldn't easily cut 3mm stock.
You're right, I'd forgotten that the top blade is curved.
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