Hourglass worm gearing with worm teeth generated by high-speed screw cutting method - (Manufacturing of high-speed hourglass worm screw cutting machine and performance test results of the worm gear generated by this new machine)

Authors reported theory of hourglass worm gearing whose worm is gen crated by high speed screw generating method, on previous report. CNC high speed h ourglass worm generating machine has been developed according to the theory . And worm cutting test and performance test of worm gearing was made. The lust results arc as follows : ( 1) Newly developed machine has high speed c utting ability same as mach type screw generating apparatus. ( 2) Surface r oughness of worm tooth surface generated by the CNC high speed hourglass wo rm generating machine has same order of roughness of screw surface cut by m ach type screw generating apparatus. ( 3) Hourglass worm gearing generated by the newly developed machine shoved high efficiency and ran 1 000 hours w ithout trouble.