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 (1916)
Ritchey, James, Monroe, Walter W. (Walter William), b. 1869 · Chicago, American technical society · leaf 77
e usedfor all patterns made from brass. Draft. After shrinkage, thesecond point of importance in awell-made pattern is draft. By the term draft is meant the bevelor taper made on all vertical parts of the pattern so that it caneasily be lifted from the sand without injury to the mold. Thisis best… … Allowances in MoldingGland PATTERN MAKING 63 the former point. As the sand is held together only very lightly,this dragging would be likely to dislodge some of the particlesand make it necessary to mend the mold. In order to avoid this,the diameter at a is made slightly greater than at 6, so that…
Patternmaking
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
