Information required when ordering gear hobs

GEAR DATA
? Normal module/OP
? No. of teeth
? Normal pressure angle
? Helix angle and hand
? Outside diameter
? Root diameter
? Amount of tip chamfer- lf applicable
? Root-fiat/full fillet
? Tip relief details- lf applicable
? DOP or MOT sizes at hobbing and finishing stage
? Material and hardness at hobbing stage

HOB DATA

? Overall size - OD x Length x Bore
? No. of starts
? Hand ofthreads
? Type - Finishing/preshave/pregrinding/roughing
? Type of profile - Nontopping/semitopping/full topping
? Class of accuracy
? Amount of shaving/grinding allowance wherever applicable