The table shows very clearly that a slight increase in forward cutting speed is better than a high return speed. A 25-foot forward speed at 4 to 1 return is much better than an 8 to 1 return with 20-feet forward speed. ALLOWANCES FOR BOLT HEADS AND UPSETS STOCK ALLOWED FOR STANDARD UPSETS BY ACME MACHINERY CO in. Upset to in. Length of Upset, 3 in. Stock required, 13 in. 31 I 11 2 2 2 2 2 2 2 2 2 3 2 2 2 2 100 100 col→→ :;:; QUICK WAY OF ESTIMATING LUMBER FOR A PATTERN MULTIPLY length, breadth, and thickness in inches together and this by 7, pointing off three places. = Board 8 inches wide, 18 inches long, 1 inch thick. 8 X 18 X 1 X 7 1.008 square feet. This is .008 too much, but near enough for most work. Board 1 X 10 X 36 correct answer is 3.75. = 540 X 73.780. The TABLE GIVING PROPORTIONATE WEIGHT OF CASTINGS TO WEIGHT OF WOOD PATTERNS Open a two-foot rule until open ends are distance apart given in table when degrees given in table can be scribed. Same results can be had with two 12-inch steel scales placed together at one end. |