Pattern making; a practical treatise for the pattern maker on wood-working and wood turning, tools and equipment, construction of simple and complicated patterns, modern molding machines and molding practice (1921)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 78
is started outthe whole surface from a to 6 is clear of the sand and can be removedwithout injury thereto. This difference in the diameters at aand h is called the draft of a pattern. Variation, The amount of draft depends upon the lengthof the part that is to be drawn out of the sand. The… … Fig. 133. Draft Template (Tinches face, should be \ inch to the foot, while on the inside of therim and on the hub of the pulley it should be in the ratio of f inchto the foot. The reason for this difference is that the face of therim is often turned and finished straight, and for that reason…
Patternmaking
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