Maximum Cone Distance....................... (30-Degree Spiral Angle w/12" Dia Wheel)...................... 15"/(381mm) Maximum Pitch Angle, 90-Degree Shaft 70-DEGREES, 34' Minimum Pitch Angle, 90-Degree Shaft 5-DEGREES, 42' Maximum Pitch Diameter: (90-Degree Shafts).: 0-degree spiral angle, 1:1 ratio 15.5"/(393.7mm) 0-degree spiral angle, 3:1 ratio 23"/(584.2mm) 30-degree spiral angle, 1:1 ratio 21"/(533.4mm) 30-degree spiral angle, 3:1 ratio 31.5"/(800.1mm) 40-degree spiral angle, 1:1 ratio 22.5"/(571.5mm) 40-degree spiral angle, 3:1 ratio 34"/(863.6mm) Coarsest DP (Module)........................ 2 DP Coarsest DP (Module) (Metric)............... (12.7-Module) Maximum Face Width.......................... 3"/(76.2mm) Work Spdl Taper Hole Dia.(Large End)........ 3-19/32" Work Spindle Bore Taper (Per Ft)............ 39/64" Work Spindle Thru-Hole Diameter............. 3.87"/(98mm) Std Grind Wheel OD.......................... 6"-8" Std Grind Wheel OD (Metric)................. (1852-203mm) Max. Wkhead Offset Above/Below Ctr.......... 4.5"