GEAR CUTTERS & HOBS

Hob or hobbing cutters are also used along with gear cutters for milling gears. The hobbing cutter is used on a hobbing machine designed specifically to machine gears, sprockets & splines.

Gear cutters & hobbing cutters are mostly made of High Speed Steel (HSS), often TIN coated for prolonged life.

Gear cutters are avail in various sizes & types depending on the gear to be machined, as their profile suits only one type of gear form. Various other gear cutters are also used such as shaper spline cutters.

Two type of gear cutter forms are avail. Diametrical Pitch (INCH) ranging from 0.5 – 64 DP and Module (METRIC) ranging 0.5mm – 50mm gear tooth form.

Gear cutters have 14 ½’ or 20’ pressure angle.

Involute gear cutters DIAMETRICAL PITCH

Please specify diametrical pitch, number of teeth, and pressure angle required when ordering involute gear cutters. See below

Involute gear cutters MODULE

There are 8 cutters per module (pitch) with this metric system, and each cutter will cut the range of teeth shown within the pitch. The pitch is the size of the tooth on a gear wheel and this is worked out by dividing the diameter.

Eg; a 60 tooth wheel with a diameter of 60mm is classed as a

1 Module ( 60 divided by 60 = 1), a 60 tooth wheel x 30mm Dia = 0.5 Module.

The 8 cutters within this Module or Pitch system all have a slightly different shape in the tooth profile; this is because the mesh angle of a tooth on a 12 tooth wheel is different to the one on a 60 tooth wheel, this is to allow both wheels to run together when rotating without binding.