Re: [CAD_CAM_EDM_DRO] Re: Encoders / Slides

Sorry Jon,

The 3 x (times) was meant to imply 3 slides, 1 for the Z axis, 1 for the Y
etc

Dave

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, December 03, 2003 6:28 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Encoders / Slides


>
>
> Dave Fisher wrote:
>
> >Hi All,
> >
> >We have a machine already fitted with 3 x 10 micron resolution glass
slides
> >that work with the DRO. We would like to convert this mill to CNC and
wonder
> >if we can utilise the slides instead of having to buy 3 rotary ?. The
slide outputs
> >seem to be 5 Volt TTL.
> >
>
> >I'm not sure what you mean by 3 x 10 micron resolution. If the glass
> >
> scale has stripes on a 12 uM pitch, that would give .000118" per
quadrature
> count. That is probably good for CNC motion control. I don't know where
> the x 10 fits in here. The problem is any backlash between the drive
motor
> and the encoder will cause servo hunting. If you use good anti-backlash
> ballscrews, it should work. it would be good to make sure you use a
> servo amp with good controls for loop compensation, as there are a
> number of places for resonances to develop in such a system.
>
> Jon
>
>
>
>
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