[TheForge] Re: engineering question

[Dan Tull]

How about:

The squared hole has two points of stress risers, while the diamond has only 
one.
The tips of the diamond more closely match the slit hole ,whereas the 
squared hole
will have to be heavily upset or have the little V's at the ends.
I still contend, without stretching, the side material will be the same 
thickness.


dan tull
georgia
abba, afc, S.C. psba, obg,sofa
----- Original Message ----- 
From: "Mike Linn" <bamablacksmith at comcast.net>
To: <mspencer at tallships.ca>; "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Sunday, October 03, 2004 2:08 PM
Subject: Re: [TheForge] Re: engineering question


>I agree with Mike Spencer... in a perfect world Walter may be correct, but 
>in practice its VERY difficult to get the on-square hole lined up properly. 
>On-diamond I think is a little more forgiving. Ultimately its going to 
>depend on the size of the stock,  a 1/2 inch hole through 2 inch stock aint 
>gonna matter but 1/2 thru 1/2 it will..
>
> mike
>
> At 11:55 AM 10/3/2004, you wrote:
>
>
>>Walter opined:
>>
>> > When you look at the forces as they flow trough the
>> > object, the square would show less stress.
>>
>>And I would say just the opposite.  But that's guesswork.  I suspect I
>>guess that because the first thing I ever made using the technique was
>>1/2" sq. through 1/2" sq. and I found it was hard and frustrating
>>trying to avoid making too-thin or stress-cracked weak spots in the
>>eyes at the inside corners, e.g....
>>
>>              ....here:
>>                   /
>>                  /
>>                 /
>>       |      | /                   |    |
>>      /  _____ \                   /  /\  \
>>     /  |    |  \                 /  /  \  \
>>     |  |    |   |               |  <    >  |
>>     \  |____|  /                 \  \  /  /
>>      \        /                   \  \/  /
>>       |      |                     |    |
>>
>>
>>Or more like....here:
>>                  /
>>                 /
>>       |      | /
>>      -+ _____+-
>>     |  |    |  |
>>     |  |    |  |
>>     |  |____|  |
>>      -+      +-
>>       |      |
>>
>>where the '+' representiong the inside corner in the outer bar comes
>>really close to the corner of the eye.  The diamond opening reduces
>>the risk of that weakness because the eye is opened to a gentler angle
>>at the problem point.
>>
>>
>>In retrospect, 1/2" sq. may just have been too small a cross section
>>for the technique combined with my skill level at the time.
>>
>>- Mike
>>
>>--
>>Michael Spencer                  Nova Scotia, Canada       .~.
>>                                                            /V\
>>mspencer at tallships.ca                                     /( )\
>>http://home.tallships.ca/mspencer/                        ^^-^^
>>
>>--
>>
>>
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