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

[schade at acegroup.cc]

not that it does you any good Larry but I can get 1/8"x1/2"x1/2" here 
in Minnesota.

Bob
___


On Oct 27, 2006, at 6:08 PM, Larry Brown wrote:

> 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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>
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