Russell demonstrated taking a bite out of a piece of 1/4" (7mm) bar with a 1" diameter punch.
The amazing thing about this set of tools was that the hole in the die was 1/8" oversize and they were made of mild steel!
Normally punch and die fits are very close but these were a complete mismatch!
Russell just adjusted the die to one side so there was a snug fit on the side he was cutting with.
The drawing shows a machined round punch and a machined notching punch. Dies are shown fabricated.
The V-notch die is shown with back-up support.
See Donald Streeter's Profession Smithing for this type die construction used in an arbor press.
Standard commercial punches and dies are also available for notching and slotting.
These shown are from Roper-Whitney and fit a standard 2-7/8" die shoe.
2003 Jock Dempsey, www.anvilfire.com
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