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Originally Posted by sanddrag
I must be missing something here. To me, it looks like you gear up by a factor of about 2 from gearbox to module then gear down by a factor of about 2.5 in the module to the wheel. Also, I'm not seeing how the globe motor actually connects to the modules to rotate them.
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Your powers of observation do not deceive you. That is exactly correct.
I designed it to move at the conventional 8 fps. Using the KOP transmissions and 4" wheels the chain reduction worked out to be about 1:1. However, using a 10:28 reduction in the modules allowed them to be made smaller, so I decided to gear the speed up outside of the module and then gear it back down again.
From the looks of it I forgot to replace the sprocket on the transmission with a 28 tooth to give me a perfect 1:1, but you get the picture.
As for the globes they will be turning chains that enter the frame through a slit an inch down.
As Tytus said I am still working on how to tension all the chains. So I have not added them in the CAD yet.
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Originally Posted by sanddrag
How much does Inventor say it all weighs (with material properties properly set of course)?
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Each module - 4.3 lbs.
The Frame - 25 lbs.
Transmissions w/o Motors - 5-7 lbs.? (not sure)
Chain - 10 lbs.?
Total - 64.4 lbs.
Keep in mind that this is still in the prototype phase. There is a
LOT of weight that could be removed. After I’ve worked out all the details then I’ll focus on making it lighter.
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Originally Posted by Tytus Gerrish
those 4 lower box tube members look like they are asking to get smashed in.
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By all means smash away!
That frame is there simply to protect the modules. It provides little structural support and can be bent and twisted. I am probably going to cover it with poly-carb to add additional armor.