Register to reply

Rack and Pinion Gears

by Jones1987
Tags: gears, pinion, rack
Share this thread:
Nov7-10, 01:58 PM
P: 79
I have looked everywhere to try and find how to calculate the distance a rack will move.

I have a mechanism where every revolution of the pinion, the rack will move one direction, then it will move back in the opposite direction. So I assume the ratio will be 2:1, every one rev the pinion does, the rack will move forward, then return. I can find loads of material on gear ratios etc, but nothing on how to work out the distance a rack will move depending on the wheel diameter and No. of teeth.

Or do I just use standard gear ratio calculations? Such as this:
Phys.Org News Partner Science news on
'Office life' of bacteria may be their weak spot
Lunar explorers will walk at higher speeds than thought
Philips introduces BlueTouch, PulseRelief control for pain relief
Nov8-10, 10:35 AM
Sci Advisor
PF Gold
Mech_Engineer's Avatar
P: 2,288
You just need to know the tooth pitch of the gear/rack, and the number of teeth on each. Given these numbers, one revolution of the pinion will move the rack (x) teeth, which you can convert to distance given the tooth pitch (teeth/distance).
Nov8-10, 10:48 AM
P: 2,055
At it's very basic level 1 rotation will mean a linear movement of 1 circumfrence. 1:1 ratio.

I'm guessing that wasn't the question you were asking though. I just thought i'd say it just incase this was a 'wood for the trees' problem.

Register to reply

Related Discussions
Self Cleaning Rack-and-Pinion Design? Mechanical Engineering 4
Designing of Rail of a Rack Mechanical Engineering 0
Pinion gear quary Engineering Systems & Design 6
Smooth pinion/roller for friction drive Mechanical Engineering 2