Years (actually decades) ago, I saw zero backlash worm gears used in radio tuners. They consisted of two thin gears mounted on the same shaft with a spring causing them to be forced to rotate in opposite directions relative to each other (just a few degrees). They meshed with a single worm.
One of the gears was screwed to the shaft. The other just applied pressure against the worm.
Ken
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Kenneth Lerman
55 Main Street
Newtown, CT 06470 |