The Method of Hob Computation
2021-08-26 13:43:54
jiangxingTools
2216
The Method of Hob Computation
Normal pitch=Mn x Π（Mn: Normal Module)
Axial pitch=Mn/cos LA
Lead=Axial pitch x Number of start
LA(Lead Angle)=sin-1(Mn x Number of start/Hob PCD)
Cam amount(relief amount)=Hob OD x Π x tan(cam angle)/Hob NT
Cam angle: Generally PA20°-10°， 14.5°-12°，25°-9°
Groove Lead=Hob PCD x Π/tan LA
Flute depth= Total tooth height if a hob+ Cam amount+1.5mm
Hob's Relief Angle=tan-1(tan PA x tan Cam angle)
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