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

[Larry Brown]

Twisting multiple elements together will shorten in length, I.E. three or 
four rounds or a mix of  squares, rounds, angles, etc. Did some nice twists 
with 1/4 round 1/4 square and 1/8 x 1/2 angle. Can't get the angle any more 
though
L Brown

At 03:53 PM 10/27/2006 -0700, you wrote:
>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
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