WAC 296-806-43006. Use safety blocks on hammers and presses

(1) You must use safety blocks on hammers and presses when dies are being changed and maintenance or repair work is being done on the machine. (2) You must provide safety blocks or wedges that meet or exceed the specifications and dimensions shown in Table 430-2. Table 430-2 Strength and Dimensions for Wood Safety Blocks or Wedges Size of timber inches using actual dimensions 4x4 6x6 8x8 10x10 12x12 Square inches in cross section 16 36 64 100 144 Minimum allowable crushing strength parallel to grain, p.s.i . 5,000 5,000 5,000 5,000 5,000 Note: Adapted from U.S. Department of Agriculture Technical Bulletin 479. Hardwoods recommended are those whose ultimate crushing strengths in compression parallel to grain are 5,000 p.s.i. (pounds per square inch) or greater. Maximum static load within short column range 80,000 180,000 320,000 500,000 720,000 Note: Slenderness ratio formula for short columns is L/d = 11, where L = length of timber in inches and d = least dimension in inches; this ratio should not exceed 11. Safety factor 10 10 10 10 10 Maximum recommended weight of forging hammer for timber used 8,000 18,000 32,000 50,000 72,000 Maximum allowable length of timber in inches 44 66 88 100 132 Size of timber inches using actual dimensions 4x4 6x6 8x8 10x10 12x12 Square inches in cross section 16 36 64 100 144 Minimum allowable crushing strength parallel to grain, p.s.i . 5,000 5,000 5,000 5,000 5,000 Note: Adapted from U.S. Department of Agriculture Technical Bulletin 479. Hardwoods recommended are those whose ultimate crushing strengths in compression parallel to grain are 5,000 p.s.i. (pounds per square inch) or greater. Maximum static load within short column range 80,000 180,000 320,000 500,000 720,000 Note: Slenderness ratio formula for short columns is L/d = 11, where L = length of timber in inches and d = least dimension in inches; this ratio should not exceed 11. Safety factor 10 10 10 10 10 Maximum recommended weight of forging hammer for timber used 8,000 18,000 32,000 50,000 72,000 Maximum allowable length of timber in inches 44 66 88 100 132