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Project 365 #71: 120317 Box Of Cogs | by comedy_nose
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Project 365 #71: 120317 Box Of Cogs

One of my Christmas presents this year was Lego set 42055, the bucket wheel excavator, and I thought it was high time to get building!


I've spent a few hours this weekend on it and I've got halfway through, with four of the eight steps complete, though I'm far from halfway through the 500+ page build manual!


This appeared in stage 4 and is the first and simpler of the two gearboxes in this model.


I've been building Lego for not far off forty years, and I can do most of it in my sleep. I do confess though that I get nervous about gearboxes.


The gearboxes are fantastically complicated and require tremendous accuracy when building. If you use a part that's even slightly wrong, insert a cog the wrong way round or space something incorrectly it can flat out not work. Even if you get all of that right, if you pinch any of the parts too tightly then the aggregated friction can cause judder and poor operation.


Because Lego Technic models are always designed to work as closely to the real thing as possible (they're an incredible educational engineering toy) the gearbox is always buried right at the heart of the model and the amount of dismantling required to debug a gearbox can be heartbreaking.


I've twisted the input shafts on this one and it looks like the output seems to do what is required, so fingers crossed it will be ok.


I'll keep you posted!

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Taken on March 12, 2017