RE: ATM 5 hour straight bolt camera platform

["Mel Bartels" <mbartels@efn.org>]

>>>
Yes, but this was a tangent arm.  Doug, as Donald put it, is describing
a
sine arm.  It provides a far more accurate approximation from the get
go,
hence adjustment curves won't need to be as extream
<<<

Right.  Merely pointing out an article describing how to draw pictures
of the drive arm, the angle of drive, the distance of drive arm, and
then to mark a point for the end of the drive arm.  A series of points
results in a curve that can be duplicated in wood or metal for more
accurate tracking.

Mel Bartels