In allusion to the diameter problem of involute starting point during gear grinding
the mathematical model of the hob rolling gear is established based on principles of gear engagement.The gear tooth profile is deduced from the hob tooth parameters using coordinate transformation method.Plot the tooth profile precisely by Matlab programming and the diameter of involute starting point is determined.Meanwhile
the theoretical result is compared with the grinding test report.The result shows that
the theoretical analysis method is correct and makes guidance on the meaning of processing gear.