I think that you can space the holes very close together in the right-left
direction, if you leave occasional stronger areas (as represented by the
spaces in my drawing below) to make sure that the remaining thin strips
don't bend out of shape under a compression load.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: "Roman Black" <fastvid@EZY.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, October 15, 2001 1:42 PM
Subject: Re: [EE]: Drilling a square tube??


> Bob Ammerman wrote:
> >
> > On a milling machine, of course ;-)
> >
> > But, you can approximate the effect by the arrangement of your holes,
> > perhaps something like this:
> >
> > * * * * *    * * * * *   * * * * *   * * * * *
> > * * * * *    * * * * *   * * * * *   * * * * *
>
>
> Thanks Bob, now we are getting somewhere. :o)
>
> Using my "very fuzzy logic" brain, what you
> are proposing is a hole structure with minimised
> walls between holes in the left-right direction.
> So it doesn't matter whether we have groups of
> 5 holes (as you drew) or just reduced the distance
> left-right between each hole, you are suggesting
> that the tension/compression strengths remain
> similar??
>
> In some other commercially drilled members i've
> seen something like this:
>
> ---------------------------
> * * * * * * * * * * * * * *
>  * * * * * * * * * * * * *
> ---------------------------
>
> on each side wall of the square tubing, which
> makes sense to me for a number of reasons.
> Any suggestions?
> -Roman
>
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