> Date: Sat, 14 Nov 2009 12:38:05 -0500
> From: [email protected]
> To: [email protected]
> Subject: Re: [Emc-users] Anilam linear encoder OUTput...
>
> Ok- so I o-scope'd the mystery wire again this time while taking the table
> through it's entire length of travel to find that the signal has a few
> places where it blips high. My question is, if an index signal on these
> encoders is supposed to give a position reference, why would there be more
> than one???
>
There are a couple of answers that I know.
Some encoders have a movable magnet that strengthens the signal.
Heidenhain did this in some of their's.
You would see a regular interval signal though with one spot stronger.
For acurite / anilam, before scanning the index pulse, you were asked to
preposition
the machine. This way they could have multiple index pulses but only use one.
While in regular use the DRO would ignore all index pulses
Some heidenhain did the same sorta thing though they only used two index spots,
close to each end if I remember right.
Chris M
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