Re: [CAD_CAM_EDM_DRO] Re: Agilent Encoder Pull-up resistor

Jon,
Like Peter, I thought that comment was a bit below the belt.
I have both Rutex and Gecko servo drives and can not speak highly enough about either brand.
Both are excellent.
I'm only using the cheapest US Digital 2 channel encoders, connected by standard network cables
(1 is about30feet long) and seems fine to me. Tuning by software is a bit of a challenge at my age,
but the info is all out there if you look.It also eliminates that old bogy of someone's "sexy fingers" syndrome, once they are set up.
I think both Marris and Vlad serve us well with bloody good products and we are all very lucky to have them.
So there!!
Regards,
Dave Pope.
Perth.

----- Original Message -----
From: Jon Elson
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: 16 August, 2006 12:38 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Agilent Encoder Pull-up resistor


Peter Homann wrote:

>Jon,
>
>That's just plain rude and offensive!
>
>The advantages of using differential signals are very clear. It's the
>reason why it's standard practice in a lot of the industrial control
>industry.
>
>
>
>
I agree that differential signals help reduce noise. Many lower-cost
CNC systems,
especially home shop-level, don't use them due to cost. All the lower-cost
encoders and servo motors with built in/on encoders, such as HP, US digital,
etc. are single-ended.

>Note to moderators: I didn't think this short of "Bashing" was allowed on
>this group.
>
>
>
If they really need differential signals for anything over one foot,
they must have
an electrical noise problem. As I say, I have worked with a number of
CNC systems
that have up to 30 feet of encoder cables, and they work fine without
differential
drivers.

I can see some reason for Rutex to recommend this just to cut down on
support
calls. Certainly, when Joe Metalworker tries to hook up a Rutex drive
to a plasma
table with 30+ feet of unshielded single-ended encoder cables, he's
going to have
a problem.

Jon





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