On Thu, 29 Nov 2018, David Berndt wrote:
Date: Thu, 29 Nov 2018 12:13:25 -0500
From: David Berndt <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected], Peter Blodow <[email protected]>
Subject: Re: [Emc-users] Spindle Encoder AEDR-8300 Encoder Ring
Ok, thanks guys. I'll go with a seperate encoder to pickup a once per
rotation count. Are there any requirements about on/off span in relation to
A/B. The "centering" of the index pulse sounds like it could be a bit
fiddly, and getting the pulse perfect would probably be difficult as well,
presumably linuxcnc won't be comparing A/B to index for any reason, just
needs that index pulse (+A/B count scaled at 1RPS).
Mesa encoder hardware has the option of gateing index with the quadrature
state but thsi is currently unused
The only disadvantage I see from a wider index pulse is that the index
location would differ in different spindle directions. I dont think there is
any circumstance in normal LinuxCNC machining operations where this makes any
difference at all.
Peter Wallace
Mesa Electronics
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