Page 275 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair
P. 275
Power Transmission Gears 257
Rgwe 6-29. Typical tooth contact patterns for single helical gearing under no laad.
A. Perfect tooth contact, no modifications.
6. Gear with end eamff modification (slight crowning)-acceptable.
C. Gear with helix angle (lead) modification cut into part-acceptable.
D. No lead modification, gear shafts slightly out of parallel-acceptable.
E. No lead modification, shafts out of parallel-not acceptable-must be corrected be-
fore operating gear unit.
F. No lead modification, shafts out of parallel-not acceptable-must be corrected be-
fore operating gear unit.
