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Eight-point Roll
Jerry

Eight-point Roll

After cutting the center 1 1/2" hole (cut under-sized with a 1 3/8" holesaw 'cause a 1 1/2" holesaw makes a larger than 1 1/2" hole) I spin the plate in a vice and very carefully file it, spinning it an 1/8th of a turn at a time... round and round and round. On DeltaCAD I drew successive holes up to the 1 1/2" and one past it (clearly marked with a dotted line instead of a solid line.) This allowed me to ease up on the hole and keep it circular.
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Category
General Biplane Photos
Album
Brake Backing Plate
Added by
Jerry
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