The fit between hob spindle and gear hob inner hole should be accurate and firm, which is necessary to improve the machining accuracy of gear hobbing. When installing the gear hob, the following points should be considered:
(1) Before installing the gear hob, clean the hob spindle, hob hole, end face, tool bar and other key parts. If these key parts are not cleaned, it will have a certain impact on the accuracy of the processed gear.
(2) The fit clearance between the gear hob and the spindle should be as small as possible. If the clearance is too large, the radial runout of gear hob is easy to occur in the cutting process.
(3) The installation shall be firm, the cutter bar shall be as short and thick as possible, and the distance between the two support points shall be as short as possible.
(4) The disassembly and installation of gear hob adopts the integrated assembly and disassembly of gear hob and mandrel, which eliminates the error caused by mandrel. It has the characteristics of simple operation and easy to ensure accuracy.