RE: [CAD_CAM_EDM_DRO] Linear Encoders

>-----Original Message-----
>From: Eric Keller [mailto:eek105@...]
>Sent: Thursday, April 06, 2000 3:01 PM
>To: cad
>Subject: [CAD_CAM_EDM_DRO] Linear Encoders
>
>
>So, here i am answering my own post. Hp makes only 360 line heads

according to the search i did on the agilent (argh! hate >that name) web
site. So i mosey down to the machine shop where they just had a bp
retrofitted with a new Accurite CNC for

>10k$. Accurite came in and replaced the old scales with new ones, so i

took one of the old ones apart. They have 4 tiny

>leds on one side and 4 tiny leds on the other side and a piece of glass

scale mounted on the head in between. The

>interesting thing is that there is a spring to jam the head up against the

glass scale. The glass scale appears to be 2

>pieces of glass bonded together. I didn't have the guts to take apart the

ones on the cnc:).

The only difference between the old ones and the new ones is the old one is
a square wave signal and the new ones are a sine wave signal.

>Just to add to the SI (metric)/GOAU (good old american units) debate, all

of the glass scales i have seen, including the 30 >year old accurite
described above actually are laid out in microns and the DRO converts it to
inches. I guess the mylar guys >are using inches because the like to be
GOA's

The scales have to be traceable to the National Bureau of Standards in
Washington DC and they want everything in metric.
The mylar guys don't.

>eric

Tim Barnard
Fagor Automation


[Non-text portions of this message have been removed]


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