Worm Gear

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Worm gear reduction ratio?

I need to calculate the gear ratio between a worm gear with 7 threads and a spur gear with 45 teeth.

Number of worm gear teeth does not matter as long as it is single pitch (likely). The worm gear has many teeth just so there will always be teeth meshing.

When the worm gear turns one revolution, the spur gear will 1/45 revolution, right? So the gear ratio is 45:1.

Hope this helps.
Bill
Retired mechanical engineer

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