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increasing the bending stiffness of steel pipe or tube?

...and filling the void with...?

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Michael Gilligan08/06/2015 21:20:26
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For info.

Whilst I am sure that users of sophisticated CAD software have such tools readily to hand ... I was very pleased to find this plug-in for SketchUp. ... I use v8, and the plug-in appears [within the idiosyncrasies of SketchUp] to work perfectly.

MichaelG.

Neil Wyatt08/06/2015 21:52:13
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Posted by Michael Gilligan on 08/06/2015 17:36:40:
Posted by Neil Wyatt on 08/06/2015 15:19:12:
Posted by Michael Gilligan on 07/06/2015 13:45:44:

Murray,

I'm surprised, and a little disappointed that you didn't endorse my clover-leaf.

... It does make a very stiff section.

MichaelG.

He might struggle to make a table that moves up and down it easily and accurately

Neil

.

Neil,

  1. That should be a trivial matter for a man with a shaper !!
  2. I did say that it may, or may not , suit Ady's design for a drill stand
  3. The original post was a general 'concept' question; the drill stand was introduced a 'ferinstance"
  4. Ady says that he has a lot of 35x5 tube available
  5. Murray's rejection of various 'internal stiffeners' was very valid, but my suggestion requires none.

MichaelG.

The man doth protest too much, methinks

Neil

Michael Checkley09/06/2015 10:40:06
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Got me on this one, but a good exercise smiley. I was looking forward to drawing a Mohr's circle but it didn't get that far!

dsc_0667.jpg

Michael Gilligan12/06/2015 21:39:51
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Posted by Neil Wyatt on 08/06/2015 21:52:13:

The man doth protest too much, methinks

.

Given this Shakespearean accusation from our Moderator, and no comment from anyone else; I wasn't going to bother posting ... but it may useful to someone, sometime:

According to the SketchUp plug-in [mentioned above]: the welded cluster of three tubes [*] is approximately 8.4 times stiffer than the single tube.

MichaelG.

[*] 35mm O.D. x 5mm Wall

cloverleaf.jpg

Nicholas Farr12/06/2015 21:57:18
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Hi Michael, I had also thought of using three tubes as per your drawing, although my first thought was to use seven tubes together which would be more circular but of course would be much more bulky and be very difficult to weld them together with total success.

Regards Nick.

Michael Gilligan14/06/2015 12:54:40
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On the subject of welding [of which I know very little] ... I think it would be quite adequate to 'stitch' the joints instead of using continuous welds.

Note: The main stiffening purpose of these welds is to prevent the tubes sliding along each other.

MichaelG.

Neil Wyatt14/06/2015 17:02:50
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> According to the SketchUp plug-in [mentioned above]: the welded cluster of three tubes [*] is approximately 8.4 times stiffer than the single tube.

Impressive, clearly a good way to go if you only have small tube, and stronger and more compact than a tube of twice the diameter.

A tube three times the diameter (i.e. with the same amount of tube in it as three smaller ones) would be 27 times as stiff.

I would be keen to see Ady make up a triple tube accurately enough for a yoke to move up and down it smoothly, though

Neil

Michael Gilligan14/06/2015 17:34:31
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Posted by Neil Wyatt on 14/06/2015 17:02:50:

I would be keen to see Ady make up a triple tube accurately enough for a yoke to move up and down it smoothly, though

.

It obviously depends upon the quality of the original tube [tolerance on OD and straightness] but the beauty of this arrangement is that it is 'self-jigging' [for want of a better term] ... Try putting a tie-wrap at each end of a cluster of three similar tubes and you will see what I mean.

Again though; I must mention that Ady's original question was conceptual, not specific to the drill pillar.

MichaelG.

 

Edited By Michael Gilligan on 14/06/2015 17:35:46

Ady115/06/2015 01:00:26
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I would be keen to see Ady make up a triple tube accurately enough for a yoke to move up and down it smoothly, though

Might be one of my have-a-look-at-that-solution-later jobs...

Thanks for all the input gents

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