![]() Some people reduce the constant factors 3/5 x 12 = 7.2 and round to 7. Say your work piece is 8" wide, then the actual stroke will be close to 9". So if, e g, you are happy cutting structural steel bar (A36) at 60 sfm, then 60sfm/(stroke length in ft) x 3/5 = number of strokes per minute to set the machine.ĭon't forget to allow for overtravel of the ram at each end. On a crank shaper, about 3/5 of the stroke is spent cutting and 2/5 on retracting. ![]() Cutting forces are influenced by the geometry of the tool, but generally tend to lift the ram on the cutting stroke, as well. The is a slight tipping effect since the ram acts well above the center of mass of the rest of the shaper however the shaper is shaped so that in use is does not actually tip with respect to the work. ![]() Then, because the geometry of the crank linkage is such that the backstroke is faster than the cutting stroke, the rest of the shaper lurches forward when the ram retracts. ![]() Actually, as the ram move forward, the rest of the shaper moves backwards (action/reaction). ![]()
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