The principles of pattern making, written specially for apprentices and students in technical schools (1900)
Horner, Joseph Gregory, 1847-1927 · London, New York, Pitman · leaf 102
nciples as a pattern wheel. These were explainedin the previous chapter in connection with Fig. 62.Before moulding the ring of teeth for a bevel wheel, GEAR WHEELS-MACHINE MOULDED. 87 it is necessary to strike a bed of sand for the bottomface of the wheel arms, and for the tooth points. Theboard is… … Fig. 69. Board for striking Bed and Cope. When the tooth block is lowered, the faces of theteeth rest on the sand struck with B, and their inneiends on the sand struck with C. The arm cores reston D. E is the strap or striking bar to which theboard is bolted. It swivels around the turned pillar…
Patternmaking
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