engineering fundamentals Discussion Forum
Directory | Career | News | Industrial
Home Membership Magazines Forum Search Member Calculators






List Recent Topics | Start a New Topic

<< Previous Message No. 13007 Next >>
Author: b1ueshift
Time: 01/14/04 14:16 PST
This is a reply to message no. 13004 by dfischer
Reply | Original Message | New Topic | List Topics | List Messages on This Topic
Current Topic:
Gearing formulas
I can tell you the answer to number 2, because it's the easiest.

Pitch Diameter equals 9.55"

Method:  Pitch of worm gear (ie distance between threads on worm) = 3/4"

For a single thread worm gear, for each rotation of the worm, the driven gear will move one thread pitch at the pitch diameter (ie pitch circle of the gear will move 3/4").

As the speed ratio of the gears is 40:1, this represents 1/40 of a full rotation of the gear so pitch circle circumference is 40 *3/4" = 30"

To get the pitch diameter from pitch circumference, divide by pi.
30/3.1416 = 9.55"
[ List Replies to This Message Only ]

Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2018 eFunda, Inc.