smdl
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| posted on 13/1/07 at 04:27 PM |
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Gearbox Mount
Hi,
I have now finished the basic construction of my chassis, and am proceeding to stick stuff onto it.  For those of you who have built your own
chassis, I would appreciate any thoughts about proper methods of attaching a gearbox mount.
I am using a Westfield mount for my Type 9, and am planning to make an adpater channel out of of 2" tubing sliced in half lengthwise, but I am
concerned about how to attach it to the chassis.
I don't want to just drill through the RHS and put a bolt through with a nut on the other end, as this would weaken the RHS, and also
potentially compress it when tightened.
I could just find some tubing with an ID matching the bolts I am using, drill a hole in the RHS matching the OD of the tubing, and weld it in to allow
a bolt to pass through, but how do I weld this in so it doesn't protrude from the RHS and impede the mount from fitting flush?
In a very similar manner, I could use a thick-walled tubing, and just tap that to the appropriate size for the mounting bolts, but the same problem
exists. Do I just grind the tubing flush to the RHS and not be too overly concerned about strength?
I believe I have also seen an example (can't locate it now) of angle iron being welded to the chassis and the mount then being bolted to this.
Is this a practical methoed?
Any thoughts appreciated.
Shaun
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mark chandler
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| posted on 13/1/07 at 04:52 PM |
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Tubing gets my vote, but then thats how I have added the occasional bolt hole.
You just drill the hole then using a ball pein hammer tap the hole edges to make them concave on both sides.
Insert the tube, leave it longer than required, and put a fillet weld around to fill the recess, then cut off flush and clean with a grinder.
Regards Mark
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Mark Allanson
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| posted on 13/1/07 at 05:43 PM |
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I just welded fillets to the chassis and made a cradle, almost 2 years on the road an no problems
 
Rescued attachment WestyMount.jpg
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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robertst
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| posted on 14/1/07 at 12:26 AM |
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quote:
Originally posted by Mark Allanson
I just welded fillets to the chassis and made a cradle, almost 2 years on the road an no problems
ooh aye! yet another one of mark allanson's tricks from his hat! that is good!
i was just thinking on using the good ol' 3mm plate, weld it across, and then use the land rover gearbox mount i bought a while ago. problem is
the threds dont match, but i guess theres a way around that.
Tom
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James
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| posted on 14/1/07 at 10:42 AM |
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Couple of plates of 3mm used for mine... 2000miles seems ok.
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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smdl
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| posted on 14/1/07 at 05:14 PM |
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Thanks, gents. All great information!
Shaun
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kp
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| posted on 20/1/07 at 10:27 PM |
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what's wrong with the book method
the book suggests welding 25mm rhs to the lower trans tunnel tubes and drilling bolt holes.
Is there a problem with this solution?
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Mark Allanson
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| posted on 21/1/07 at 10:28 PM |
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..drilling bolt holes into what?
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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James
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| posted on 24/1/07 at 02:39 PM |
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quote:
Originally posted by kp
the book suggests welding 25mm rhs to the lower trans tunnel tubes and drilling bolt holes.
Is there a problem with this solution?
You'll crush the tube if you do it up tight.
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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