Re: [CAD_CAM_EDM_DRO] Udated DRO

Bob,
No, I did not put a pulley on the encoder, but put a pair of pulleys in the
line to the encoder. See my web page at

http//:www.surfsouth.com/~axtein/dro/dro1/index.html

Where I have attempted to show the path of the cable at the bottom of the
page. The diameter of the pulleys is not important and should be sized to
fit YOUR system. In my case, they are about 2" in diameter and that was
necessary to clear the X axis lockdown screws on the mill table. This can
be seen in the picture just above the text and to the left (hopefully you
can see the cable path there). The main idea is to keep ALL cable paths
parallel to each other so the cable will not loosen or tighten as the table
moves. The most importan cable path is between the anchor on the encoder
side and the actual path over the encoder axle, on the other side of the
table, it is a simple matter of balancing the amount of cable movement that
is on the encoder side. In other words, the balance side doesn't really
need to be parallel IF the amount of takeup is correct.

Basically (no pun intended), the pulley is:
a) Round!!
b) Has a hole in it to fit the bearing I use.
c) Has a groove in the outside diameter about 0.060" wide by 0.0.30" deep
to make sure the cable tracks!

You milage may vary depending on the parts that you have on hand to use!

Sounds confusing, but thats just the physics of the thing. Took me several
months to rationalize that one out!

Art

At 04:59 PM 7/6/00, you wrote:

>Art,
>
>Did you put some sort of 'pulley' on the encoder shaft for
>the cable to run in/on? If so, what is its shape and size?
>
>Thanks,
>
>Bob

OLDER THAN DIRT

Country Bubba

(Actually the inventor of Country and Bubba)

axtein@...