Followup.
American Standard 25-1 chain has a 0.25" pitch. A standard 9-tooth sprocket would be 2.25" per turn. A Spectrol 533-series 3-turn potentiometer would have measuring range of 6.75", with 0.25% linearity.
-- Tony Williams.
Noise, is dependant on slop in the gear, and how you drive the stepper. If you micro-step (even to a 'simple' level like 8 steps), and the gear has some form of spring bias, the result can be smooth and quiet. Some 'Type N' stepper motors are sold with an internal nut, and a hole right through, to drive exactly this configuration.
Best Wishes
I read in alt.binaries.schematics.electronic that Jim Thompson wrote (in ) about 'CHEAP Linear Motor/Actuator', on Mon, 25 Apr 2005:
Put some thick grease on it.
Screw needs to be rigid, so make that the steel bit.
-- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except 'What is a Moebius strip?' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
something like this?
-Lasse
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