"Jim Wilkins" wrote in message
...
On Dec 20, 12:15 am, "Harold & Susan Vordos" wrote:
...Even a lousy three jaw with sprung slides is capable of decent
work, assuming you follow "the rules" when preparing soft jaws. In the
hands of a fool, they can, and will, disappoint----but when applied
properly, they can be salvation when all other attempts fail.

Harold

How do you preload the jaws to turn the clamping surfaces when they
will expand outwards? I don't have an expensive ring set and was
wondering about wrapping a strap around the jaws.

jsw

In all my years, I ran only one job that required that setup. *Really!*
:-)
If you took a look at the link I provided, think about the "spider" I talked
about. You can make a ring with tapped holes located precisely @ 120
degrees so you can load the jaws upon expansion. As long as you're in front
of the scroll, you'll achieve success of sorts, but the closer you load the
jaws to the location where the part will ride, the better.

With tapped holes and some all thread, you should be able to adjust jaws to
any position, which is the purpose of the spider.

As in all cases, be certain you use the same socket when tightening the
chuck---it makes a huge difference in how the chuck responds, especially if
it's worn.

The strap would work, assuming you can get it on at the desired diameter.
A ring with tapped holes would be better.

Harold