gearcutter, this is the case, you are right. The shoulder is the problem. I will try the adress you send me. Also Javier72, i must see "mitsubishi" and "koepfer".
Thank's
Hello dimjim
The part is a group of gears, one can be hobbed but one can not, or a pinion that can not be hobbed. Also we speak about gears under "module 1", and precisions 6, 7, 8 DIN (11, 10, 9 AGMA). I believe EDM is not a solution.