In set 6847 (Space Dozer, http://www.peeron.com/inv/sets/6847-1) there is a black Technic Axle 6 that has no structural or cosmetic function in the set. I don't have the original instructions or box, so it might have been included to build one of the alternate sets. Or some other reason?
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It's structural, but not really mandatory:
The full (4 pages) instruction can be found by googling or e.g. there: http://lego.brickinstructions.com/lego_instructions/set/6847/Space_Dozer
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Well, it's not really of structural importance, as the 4 x 6 plate in step 2 holds them together. I had the scanned instructions already, but was wondering if on the box, any of the alternative builds sometimes pictured used it. – Reven Dec 29 '13 at 20:12
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Well, it will, to some degree, keep the 1x6 technic beams from coming off the plate above when too much pressure is applied from above. Without that axle, I see the 1x6's coming off all too easily. – gev Dec 29 '13 at 23:15
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if they'd put a plate under those beams to keep them in place the vehicle would have no ground clearance (or possibly negative clearance). You could always build it and find out... – Móż Dec 31 '13 at 22:49
When weight is applied on the structure, the wheels are are creating a twisting motion that will eventually dissasemble the 1x6 beams.
With the extra structural part when a load is applied there is a lot of flexing but the 1x6 beams are staying in place.
Effectively, the axle is preventing the beams from rotating out of place.
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