Re: Off on an interesting tangent (bellows-way covers)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "mayfieldtm" <mayfiet@i...>
wrote:

> I've used what's called `Constant Force Spring'
>
> It's the tape part of a tape measure!
>
> Fit it in a groove and the free end will keep
> itself rolled up.
>
> Use one on each side of the carriage or whatever
> so they will balance each other out.
>
> I've seen it about 1-1/4" wide, would think
> it would be available in wider stock.
>
> Tom M.

a quick look at Mcmaster-Carr shows the widest they have is 2.00 in
and the tension force is 40lbs. I don't think adding that
much "pull" laterally on my router head is wise. A simple window
shade has a mechanism that I think I might be able to adapt to the
task.