The Economy of Workshop Manipulation a Logical Method of Learning Constructive
The Economy of Workshop Manipulation a Logical Method of Learning Constructive
Richards John N.
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With a moving 132 WORKSHOP MANIPULATION, platen the larger and heavier a piece to be planed, the more firmly a platen is held down ; and as the cross section of pieces usually increases with their depth, the result is that a planing machine properly constructed will act nearly as well on thick as thin pieces. The lifting strain at the front end of a platen is of course in- creased as the height at which the cutting is done above its top, but this has not in practice been found a difficulty of a...ny im- portance, and has not even required extra length or weight of platens beyond what is demanded to receive pieces to be planed and to resist flexion in fastening heavy work. The reversing movement of planing machine platens already alluded to is one of the most complex problems in machine tool movement. Platens as a rule run back at twice the forward or cutting movement, and as the motion is uniform throughout each stroke, it requires to be stopped at the extremes by meeting some elastic or yielding resistance which, to use a steam phrase, " cushions " or absorbs the momentum, and starts the platen back for the return stroke.
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