Newsgroups: comp.robotics
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From: jeff@bme.ri.ccf.org (Jeff Miller)
Subject: Re: How do Digital Calipers work?
Message-ID: <1995Jan20.183921.19249@bme.ri.ccf.org>
Organization: Biomedical Engineering, Cleveland Clinic Foundation
References: <1995Jan7.014420.26002@wmichgw> <9501100907.0CTIS00@circellar.com>
Date: Fri, 20 Jan 1995 18:39:21 GMT
Lines: 24

In article <9501100907.0CTIS00@circellar.com> jeff.bachiochi@circellar.com writes:
>
>        Andrew,
>        
>        Most are mechanical.  The jaws movement causes a shaft to spin.  The
>device on the shaft may be one of many kinds, i.e. resistive or interruptive. 
>Think of a bicycle wheel and a device to count the spokes going by.
>        
>        It really boils down to precision mechanics.
>        
>                        jeff
>


The new ones have a wiper which runs up and down a resistive strip.  I
think it is just like a linear potentiometer.  They must be cheaper to make
than precision rack and pinions, because most (if not all ) of them are 
made this way.

-- 
Jeffrey H. Miller    jeff@bme.ri.ccf.org
Biomedical Engineering Department
Cleveland Clinic Foundation

