Re: [CAD_CAM_EDM_DRO] Udated DRO

I had thought about using a spring to maintain tension, but so far, it
seems to be ok. As previously stated, for accuracy as well as tension, all
has to be in proper alignment. As for tension on the cable, this is also a
reasonfor the ball bearings. If you look at the specs on the US Digital
site (theirs uses primairly sleeve bushings, they limit the load to 2
pounds. On my setup, I just slide the block out and push on it like H..eck
and then tighten it down. If I then "strum" the cable, it almost has a low
pitch like a guitar string!

I would say that was more than 2 pounds!

I was also toying with the idea of using just a spring on of off side for
take up and forget the takeup pulleys etc, but have thought better of that.

Later,

Art

At 07:42 PM 7/7/00 +0100, you wrote:

>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 -----

OLDER THAN DIRT

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