On Mar 31, 12:51*pm, "Wild_Bill" wrote:
There is full rotation of the table, Bob, as Pete commented, and on most RTs
the screw/worm can be disengaged to allow the table to turn freely (so ya
don't need to crank the handle to get to the opposite side).

Mine has a separate 24 position hole circle and index pin for use when
the worm is disengaged.

In addition to disengaging the worm, there should also be a screw to
adjust/limit the engagement of the worm. With this adjustable stop screw,
the amount of worm engagement can be adjusted so that each time the worm is
re-engaged, it stops just short of dragging or binding. When properly
adjusted, backlash is non-existent or at least minimal......
--
WB

It doesn't quite work on mine, when tight on one side there is
backlash on the other, as though the 40 tooth gear isn't quite
centered on its bearings.

Some have graduated degree wheels, others a set of index plates which
are more precise and easier to use when you need to index some large
number of identical spaces, like cutting a gear. I think the degree
wheel might be easier to figure out if you had to rotate by one large
angle, such as making a plate cam or a smooth curve between protruding
arms, like this:
http://picasaweb.google.com/KB1DAL/T...75471032901730
Either way, they are tricky to use unless you are comfortable with
math and geometry.

Jim Wilkins