JimSpencer
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| posted on 24/9/10 at 09:12 PM |
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Bolting through a tube.
Hi
For various reasons i'm going to have to put an M8 bolt through a 25mm square section tube, and then they'll be quite a load on it.
My plan is to drill a 12mm hole right through the 25mm square tube.
Weld a 12mm od / 8mm ID x 25mm length of round tube into the hole - welding right round the circumfrence each side, & grind flush.
My theory being that this will leave a nice strong length of tube and a hole to bolt through that won't crush.
Am I deluded and this is a really bad idea..
Is there a better method?
Your thoughts appreciated, working on the theory that the bolt's goto go where the bolts goto go..
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steve m
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| posted on 24/9/10 at 09:17 PM |
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I used an old 1/4 drive socket to fill the void, assuming you can get to one end of the "open" tube and slide it in
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MakeEverything
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| posted on 24/9/10 at 09:28 PM |
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quote:
Originally posted by JimSpencer
Hi
For various reasons i'm going to have to put an M8 bolt through a 25mm square section tube, and then they'll be quite a load on it.
My plan is to drill a 12mm hole right through the 25mm square tube.
Weld a 12mm od / 8mm ID x 25mm length of round tube into the hole - welding right round the circumfrence each side, & grind flush.
My theory being that this will leave a nice strong length of tube and a hole to bolt through that won't crush.
Am I deluded and this is a really bad idea..
Is there a better method?
Your thoughts appreciated, working on the theory that the bolt's goto go where the bolts goto go..
Standard practice dfor bushing. Go for it.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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RichardK
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| posted on 24/9/10 at 10:17 PM |
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Sounds ok to me, I did similar all around my build.
Rich
Gallery updated 11/01/2011
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balidey
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| posted on 25/9/10 at 07:46 AM |
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Not sure about the 'grind flush' as unless you are happy that you got a decent penetration you could be removing most of the weld. Can you
not leave the tube projecting a couple of mm ?
Dutch bears have terrible skin due to their clogged paws
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MikeR
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| posted on 25/9/10 at 09:26 AM |
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I did the same - but i welded in a threaded tube. Around the edge of the hole i used the centre punch to bend the metal into the tube a little and
widen the gap between the threaded insert and the tube. This allowed the weld to penetrate more and provide me with some more confidence - its whats
holding my gearbox in place!
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Bluemoon
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| posted on 25/9/10 at 11:57 AM |
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Yep that's how you should do it.. Like other said though careful grinding it flat.
Had a similar issue on the MK roll bar, ended up using a 4xm8 cap heads on each side of the hoop with with a 8.5mm hole in the box section in one
side, and a clearance hold for the head on the other, so the cap-head camped only the edge of one tube. Not ideal, but I can't weld, would be
best to do as you say..
Dan
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MikeR
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| posted on 25/9/10 at 01:06 PM |
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If you can't weld in a tube (and i'd really really try to) make sure you have a large very thick washer to spread the load over the tube
with the hole - especially making sure it goes over the edges of the tube.
But again - try to weld something in, its the best approach.
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JimSpencer
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| posted on 25/9/10 at 05:27 PM |
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Hi All
Thanks for that, tube cutter and welding kit it is!
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