Doug;
I've found linear position sensors on eBay from time to time. A nice sensor
is the LVDT- type (linear variable differential transformer). It is excited
by an AC source and its magnetic core is used to read the position. Most
require an external electronics circuit to work but now and then you can
find one with built- in electronics.
A linear potentiometer is a lower cost option that is well- suited to
measuring longer travels.
A "cheap & dirty" solution is to use a conventional potentiometer-- place a
pulley on its shaft and use 1/16" aircraft cable (or even a piece of string)
to rotate the shaft as the cable is pulled up & down. These wear out
eventually (LVDTs don't) and be sure to use a "linear taper" pot.
Well, since your ticket is not refundable I guess you'll just have to go to
OZ for a vacation; it's a great country!
Regards, Neil Tucson, AZ
-----Original Message-----
From: land-speed-bounces+neil=dbelltech.com@autox.team.net
[mailto:land-speed-bounces+neil=dbelltech.com@autox.team.net] On Behalf Of
DougOdom
Sent: Thursday, February 14, 2008 5:49 PM
To: LandSpeed List
Subject: [Land-speed] Travel Sensors?
We are going to add a couple new sensors to our LM-1 Data system. Does
anyone know any good supplier for linear travel sensor or string pot
type sensor?
The travel on the suspension will only be about 1/2 inch but I can use a
bell crank to make it read more than that. If you have a bad story just
send me an off line email so we don't make anyone mad. Doug Odom in
big ditch still not a happy camper about not being able to race in
Australia and the plane ticket is not refundable.
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