RE: ATM 5 hour straight bolt camera platform

[doug kniffen <dk@usmo.com>]

At 11:19 AM 9/22/00 -0700, you wrote:
>
>For that matter, please remember the S&T article by a French amateur
>describing how to use tangent arm drives with ala French curved arms
>for more accurate tracking.  It was from the '80's, I think.
>
>Mel Bartels

Maybe I am re-inventing the wheel. Why didn't the platform in the article
you mention become popular or well known? It is easy to see problems if the
curve was difficult to make, the dimensions were critical, or there was a
significant chronological limitation due to the mechanical arrangement.
Easy and non-critical are the characteristic goals  for this curve. Either
way, old or new, there doesn't seem to be any commonly known widely
available info on this. The article you mention "rings a bell", so I'll
probably look for it tonight. I'll also ammend the sketch and work on
instructions for making the guide curve so that anyone can cut the required
shape with only a few minutes effort. There does seem to be quite a bit of
interest for a simple long duration barndoor camera platform.

Doug  Kniffen