Re: [CAD_CAM_EDM_DRO] Udated DRO

Hi,

I have been considering a similar set up to yours for a DRO but I was going
to use another pulley outboard of the encoder as well. By doing this you can
take a complete turn around the encoder shaft (yes, I know it will screw but
I thought that the shaft would probably be polished enough for the line to
maintain a reasonable position) and it also takes all the strain off the
encoder shaft. That is, the line goes from the moving bit of the lathe to
the encoder, once round its shaft and then straight on outwards to a pulley
from where it heads back along the lathe bed to the pulley at the other end.
This method should also allow you to put more tension in the system which
will help with keeping the cord in line. Have you used a strong tensioning
spring at one of the anchoring points of the cord to protect it from
snagging?

Ian

--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: A. G. Eckstein <axtein@...>

> Bob,
> No, the cable just rides on the shaft and is guided by the slot in the
> encoder block. In theory, there should not be a tracking problem as you
> "should" have all shafting parallel as well as all cabling. When I was
> initially working on this, I tried using several wraps (like the old radio
> dial), but the cable "screwed" on the shaft and therefore would not
> maintain its parallel position relative to the bed.