The gear and pinion gear of spiral bevel gears are usually milled with the one facemilling cutter

it means the gear cutter and the pinion cutter have the same cutter number.In the process of tooth milling

the cutter axis is set perpendicular to tooth root cone

resulting in pitch cone pressure angle inconsistent at inner side and outer side.This is the fundamental reason of causing diagonal contact.Based on local synthesis and tooth contact analysis（TCA）

the tooth profile of spiral bevel gear is designed with constant-depth

and it can be milled by conventional spiral bevel gear milling machine.In the process of tooth milling

number 0cutter axis is set perpendicular to pitch cone.The pitch cone pressure angle is consistent at inner side and outer side

and the diagonal contact is eliminated fundamentally.For above content

the milling experiment shows that good tooth surface contact is easy gained.For spiral bevel gear

this study has a significant effect on improving tooth mesh quality and machining efficiency of spiral bevel gear.