Re: [CAD_CAM_EDM_DRO] Rotary to linear translation - an interesting idea.

Ward,

I never doubted the compression/extension effects of bending metal,
having worked in precision sheetmetal for several years. As I mentioned,
the two opposite direction bends will work to stretch the material,
negating at least some of what you have gained. If it does work, it's a
darn clever approach.I just have my doubts that it really will work in
this application. I don't have any hangups about the approach either.
Would be pretty easy to build.

Another approach that could work would be to tilt the axis of the
measuring roller slightly, something like a VCR head in relation to the
tape but not as severe. One would need to constrain the ribbon to
prevent it climbing off it's intended track. This arrangement would
generate a slip angle, and a difference in relative travel.

However, the setup I previously described using opposing disks running
on a round rod really does offer a lot. Everything could be enclosed in
a sealed housing and standard shaft seals would insure nothing gets
inside the unit. I passed on it due to the need to make a circuit board.
If I still had the plans, I'd just use the DRO kit Dan is selling, and
build some for my lathes.

Jon