<p>It's structural, but not really mandatory:</p>

<p><img src="https://i.sstatic.net/qEKn5.jpg" alt="enter image description here"></p>

<p>The full (4 pages) instruction can be found by googling or e.g. there: <a href="http://lego.brickinstructions.com/lego_instructions/set/6847/Space_Dozer" rel="nofollow noreferrer">http://lego.brickinstructions.com/lego_instructions/set/6847/Space_Dozer</a></p>

CC BY-SA 3.0
2013-12-29T20:12:53.897Z
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
CC BY-SA 3.0
2013-12-29T23:15:20.630Z
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
CC BY-SA 3.0
2013-12-31T22:49:39.367Z
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
CC BY-SA 3.0
2013-12-29T13:59:17.877Z
2013-12-29T13:59:17.877Z
Stephane Delcroix
<p>When weight is applied on the structure, the wheels are are creating a twisting motion that will eventually dissasemble the 1x6 beams.</p>

<p><img src="https://i.sstatic.net/s3AIR.jpg" alt="enter image description here"></p>

<p>With the extra structural part when a load is applied there is a lot of flexing but the 1x6 beams are staying in place. </p>

<p><img src="https://i.sstatic.net/CWMTk.jpg" alt="enter image description here"></p>

<p>Effectively, the axle is preventing the beams from rotating out of place.</p>

CC BY-SA 3.0
2014-01-02T07:42:11.147Z
Yay for Science! Nothing like the experimental approach. :)
Reven
CC BY-SA 3.0
2014-01-01T16:52:56.717Z
2014-01-01T16:52:56.717Z
pcantin
<p>In set 6847 (Space Dozer, <a href="http://www.peeron.com/inv/sets/6847-1" rel="nofollow">http://www.peeron.com/inv/sets/6847-1</a>) 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?</p>

<building><piece-information>
What is the purpose of the Technic Axle 6 in set 6847?
Reven
# What is the purpose of the Technic Axle 6 in set 6847?

(Asked by: username_0 on 2013-12-29)

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?

**Tags:** building, piece-information


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## 2 answers

### Answer by username_1 on 2013-12-29. Score: 4 | Accepted answer

It's structural, but not really mandatory:

![enter image description here](https://i.sstatic.net/qEKn5.jpg)

The full (4 pages) instruction can be found by googling or e.g. there: <http://lego.brickinstructions.com/lego_instructions/set/6847/Space_Dozer>

> **Comments:**
> **username_0**: 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.  
> **username_2**: 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.  
> **username_3**: 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...  

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### Answer by username_4 on 2014-01-01. Score: 8

When weight is applied on the structure, the wheels are are creating a twisting motion that will eventually dissasemble the 1x6 beams.

![enter image description here](https://i.sstatic.net/s3AIR.jpg)

With the extra structural part when a load is applied there is a lot of flexing but the 1x6 beams are staying in place.

![enter image description here](https://i.sstatic.net/CWMTk.jpg)

Effectively, the axle is preventing the beams from rotating out of place.

> **Comments:**
> **username_0**: Yay for Science! Nothing like the experimental approach. :)  

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