Overview > Tooth Cutting

Tooth Cutting

Gleason Phoenix Cutter
Gleason Phoenix Cutter

For cutting bevel gear teeth, Arrow is equipped with the advanced technology offered by Gleason's Phoenix CNC tooth cutting machines.

For hobbing and shaping spur gear and helical gear teeth, Arrow is equipped with the latest Gleason Phoenix and Lorenz systems.

Arrow's four CNC gear inspection systems are used to check the accuracy of all tooth cutting and grinding operations.

Size Ranges

Gleason Phoenix Hobbing Machine
Gleason Phoenix Hobbing Machine

Spiral Bevels
3/8" (9mm) to 30" (762mm)

Straight Tooth Bevels
3/8" (9mm) to 14" (360mm)

External Spur Gears and Helical Gears/Splines
1/4" (6mm) to 36" (914mm)

Internal Gears/Splines
1/2" (13mm) to 36" (914mm)


More about Tooth Cutting

For bevel gears, the tooth cutting process is performed with a special cutter which features cutting blades mounted in the positions necessary to achieve the desired tooth geometry [Fig.1]. Assembling the cutter is a highly precise operation, as the cutting blades are positioned within tolerances of 20 millionths of an inch or one half of a micron which is 200 times thinner than a human hair. Once the part and the cutter are mounted in the machine, a complex motion is used to cut, or generate the tooth profiles as the part is rotated while the cutter is both rotated and tilted.

For external spur and helical gears and splines, which are referred to as parallel axis gears, the method of hobbing is typically used [Fig.2]. The cutting teeth of a hob are on a helix like the threads on a screw. The hobbing machine turns the hob while also turning the gear and progressively cuts into the work piece.

For internal spur gears and splines, the typical process is shaping. In shaping, the cutting tool looks like a tapered gear [Fig.3]. During shaping, the tool strokes up and down rapidly as it turns with the part. Each time the cutting tool completes a revolution, it is moved deeper into the work piece.

Bevel Gear Cutter
Fig.1 - Bevel Cutter
Hob Cutter
Fig.2 - Hob Cutter
Shaper Cutter
Fig.3 - Shaper Cutter