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Additional info for AGMA 6022-C93 Design Manual for Cylindrical Wormgearing
1 Hob oversize is over 15" or a large When the thread lead angle Depending onthe tangential feed ratesused, and numberofthreadsareinvolved, thetangential the amount of radial oversize selected, required hobbing method should be used to achieve the best wormgear tooth accuracy and initial contact may be wormgearaccuracy. Inthis method, the hobisfed in more easily obtained with a flycutter than a hob. a direction tangent to the pitch diameter of the wormgearbeinghobbed. A tangentialhobis 12 Materials and heat treatment taperedalong its axis.
The removed to form the threads on the worm, accurate cutter axis is set parallel to that of the worm. With and smaller outside diameter worm blanks are the worm stationary, the cutteris fed inwardto the required to produce consistently accurate worms. desired thread depth. The worm then is rotated slowly with the rotating cutter being moved simultaneously on an axis parallel to that of the worm according to the threadlead. The thread is complete whenthe worm has rotated slightly more than one revolution.
Janninck, Surface Contact Toplogy Of Worm Gear Teeth, AGMA 87FTM14. 10,1954. L. R. Mayo, The Design AndUse Of Worm Gear Hobs, AGMA P l 9,1932. 1 3, 1954. oo00 APPPr. 1 inch (25 mm) Mean worm diam. 76' B B 0 . 93' ~ o . o O O ~l o . 51' APPPr. 2 inch (50 mm) Mean worm diam. 09' B O . 04' 50 ratio ~ o . 5 inch (216mm) Mean worm diam. 06' 50 ratio 18 inch (457 mm) wheel 9 Y6 ratio 50 ratio 35 COPYRIGHT American Gear Manufacturers Association, Inc. Licensed by Information Handling Services A G M A b022-C 93 m Ob87575 0003432 571 PUBLISHED BY AMERICAN GEAR MANUFACTURERS ASSOCIATION 1500 KING STREET, ALEXANDRIA, VIRGINIA 22314 COPYRIGHT American Gear Manufacturers Association, Inc.