Re: These servo motors worth a darn?

Yup, that would be US Digital.

I just trashed an old Digital Research computer. Must have been hanging on
my mind.

On the mylar strips, do I just go ahead and order a total number of inches,
or does it need ot be pre-cut.

When I mount it, should it be spring loaded at one end?

Is there a certain amount of tension it should be under?

Marshall Pharoah
Software Engineer
Adirondac Software
PIC/6805/6811/68000
Asm/C/C++

-----Original Message-----
From: stratton@... <stratton@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Wednesday, October 20, 1999 1:16 PM
Subject: Re: [CAD_CAM_EDM_DRO] These servo motors worth a darn?

>From: stratton@...
>
>> From: "Marshall Pharoah" <pharoahm@...>
>>
>> I've been looking at building the DRO using Digital Research mylar

strips,

>> with an eye towards later on adding either steppers or servos. Am I
>> heading down the wrong route?
>
>It may not be the most efficient road, but I wouldn't call it wrong.
>First, having the DRO itself is a big plus for computer 'assisted'
>machining. I've done things using the computer for guidance and my
>hands as the servos that would have required a tracer attachment to do
>otherwise.
>
>You may not be able to run a full closed-loop servo system using the
>linear encoders, however if supported by software they could provide a
>great 'missing step' detector for an otherwise open-loop stepper
>system. And even in a servo system with rotary encoders, I could see
>them being beneficial as a secondary confidence check. But again that
>requires software support.
>
>The biggest reason I think you should go ahead though is the
>experience you will gain by figuring out how to mount the scales, wire
>up the encoders, interface them to the computer, find or write
>software, etc. All of that should come in usefull when you go for
>full CNC.
>
>Chris
>
>PS - do you perhaps mean "US Digital" instead of "Digital Research"?
>The former manufacture mylar strips for use with HP reader heads, I'm
>not aware of the later being in the DRO business.
>
>--
>Christopher C. Stratton, stratton@...
>Engineer, Instrument Maker & Horn Player
>(978)538-5179 work, (617)492-3358 home
>30 Griswold Street Cambridge, MA 02138
>http://www.mdc.net/~stratton
>
>>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems in the above catagories.

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