Information required when ordering gear hobs

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