>
> I'm curious, what is the resolution of the scale? and the encoder?
> Chris and I were discussing this last night a bit - I'm of the
> impression that its a lot harder to get high counts per inch in a scale,
> since you don't have the mechanical advantage of the screw working in
> your favor.
>
The scales are SONY scales with an MD10A interpolator on them. The
interpolator gives a max resolution of .5 UM. .5 micrometers is
0.00002 inch. I don't know what the interpolator is configured for. It
can be configured for .5, 1, 2, 2.5, 4, 5, 10 UM.
>
> > I offer the use of the G&L as a test bed for your software.
>
> Might take you up on that.
>
I have DAC output from the ppmc boards to the A/B ac servo amps. I
don't have motion yet. I am a lot closer. We will try to determine why
the amps don't output later today.
> Regards,
>
> John Kasunich
>
>
>
------------------------------
>
> Message: 4
> Date: Mon, 21 Jan 2008 05:08:02 +0000
> From: Chris Morley <[EMAIL PROTECTED]>
> Subject: [Emc-users] FW: more scales
> To: EMC <[email protected]>
> Message-ID: <[EMAIL PROTECTED]>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Analog glass scales signals can be divided with off the shelf (or cheaper off
> ebay) >components. I have a heidenhain encoder that by its self has
> resolution of aprox (its >metric) .0005 inches then I have a box that divides
> by 5 for aprox .0001 inches. The box >also converts to square waves
> signals.Those are common. I have seen others that >divide by ten (on ebay)
> and u can buy others that divide by up to at least 256. and >encoders come in
> different resolution and accuracy . That being a good point that >resolution
> and accuracy are not the same. The right type of scale can be matched to
> >have close to the same thermal growth as the machine does.
> just info I have gathered.
>
> Chris Morley
>
>
The scales are metallic. They will grow along with the machine
components. This should give good accuracy. We keep the shop
temperature pretty constant.
thanks
Stuart
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