Re: [Spam] RE: [CAD_CAM_EDM_DRO] Quadrature encoders

The cap could help the mechanical encoders do get noisy after a bit of use.
I use the Gray Hill form Digikey about $25.00 but are optically coupled so
they do not get noisy. The also have an extra sw . Pushing on the switch .
It can be used to increment to the next axis.
Jim

----- Original Message -----
From: "Andrey Lipavsky" <alipavsky@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 07, 2005 10:01 PM
Subject: RE: [Spam] RE: [CAD_CAM_EDM_DRO] Quadrature encoders


>I was able to get only the Bourns 24-detent/24-pulse unit, as it's the only
> one Bourns actively manufactures. However, I'm seeing some strange
> behavior
> with TurboCNC. There doesn't seem to be a consistent detent count that
> correlates to step increments. For example, I turn the dial 3 ticks and
> get
> one increment of motion, then I turn 4 ticks and get 4 increments of
> motion,
> then I turn 5 ticks and get one increment of motion. Also, on occasion
> and
> while turning in the same direction, I will get a reverse increment in the
> midst of correctly-directed ones.
>
> The Bourns data sheet recommends a 0.0015uf cap across the A&B inputs to
> deal with debounce. Could this have something to do with it or am I
> simply
> dealing with a limitation of a mechanical encoder?
>
> Any insight and wisdom would be much appreciated.
>
> Andrey
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of CalBoy101
> Sent: Thursday, June 16, 2005 2:43 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [Spam] RE: [CAD_CAM_EDM_DRO] Quadrature encoders
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Alan Marconett"
> <KM6VV@a...> wrote:
>> Hi Andrey,
>>
>> I like the HP shaft encoders $$$. US Digital has encoders as
> well. You
>> might look at Bourns, DigiKey has them, ECW1J-B24-BC0024. I have
> a pair,
>> haven't implemented them yet. A little more detent then I'd like,
> but you
>> might like it. About $3 ea.
>>
>> Alan KM6VV
>
> Andrey-
>
> Depending on what you're hooking them up to, you may want the Bourns
> encoders that genenerate 6 "cycles" per revolution, the part number
> above generates 24 and also has 24 mechanical detents. When you hook
> up the encoders above to the Mach package for example using the
> Keygrabber tool, you'll get 4 increments per mechanical detent, not
> what you want. The 6 cycle ones will give you one increment per
> detent. They make one with 24 detents and 6 cycles.
>
> The reason this happens is most interfaces generate an increment at
> every edge coming out of the encoder, and their are 4 edges per
> cycle.
>
> Good luck-
>
>
>
>
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> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
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> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
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