[TheForge] Re: Twister (Was:: housekeeping...)

[Ries Niemi]

the losing length thing is one of those urban myths-
solid material will not lose any length.
It will twist around its core, but not shorten up at all.
Hollow material that collapse when twisting, such as pipe or square 
tubing, is another story- it does get shorter, as the pipe collapses.

ries


On Oct 27, 2006, at 3:07 PM, Michael wrote:

> Dave's twister is as good as anything I've seen; the spring loaded 
> mounting
> on one end is a very nice touch, allowing constant tension to be 
> maintained
> on parts that are losing length, without creating any tendency to 
> reduce
> their cross section dimensions.
>
> When twisting hot-rolled 1/2" square bar and Japanese square tubing, 
> back in
> the late sixties; we ran at four RPM output fed from 1/2 horse motors 
> (1725
> RPM) to achieve maximum twists (right up to a threaded look before the 
> bars
> gave way, suddenly twisting apart). Two other aspects were a handle on 
> the
> gearbox so that the picket ends could be aligned in a flat plane after 
> the
> twist, and both mountings had to be closely aligned (we simply use the
> square bar as a gauge and tack welded, tested, then strengthened the
> weldments.
> Mikey
>
>
>
>
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Ries Niemi
Industrial Artist

http://www.RiesNiemi.com