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Drive Chain Conversion
#1
Its been a while since i have posted, but i have been very busy converting Mr Baddeleys printed drives from belt driven to Chain driven.
This required a bit of thinking and some Luck haha Big Grin .
i purchased all the parts of Vex Robotics and will include screenshots of the order sheet with the SKU numbers.

I did this due to the belts slipping on my printed version. I was using the modified single belt design, and just had no luck getting it working no matter what i tried.
I was very impressed that the vex drive wheel sprockets bolting holes lined up perfectly with the printed drive wheel.
I used a half print of the drive wheel gear as a spacer to line up the drive wheel sprocket with the motor sprocket and another bearing to finish it up nicely against the side of the drive wall.

I will post some pics to demonstrate and also a video showing the movement. As i have been extremely short on time, working 2 jobs and trying to get this driving by XMAS i will post more videos soon of R2 driving in his more complete stage.


[Image: attachment.php?aid=1372][Image: attachment.php?aid=1373]




My old setup


[Image: attachment.php?aid=1374]


Half print drive wheel gear as a spacer (and bolts lining up perfectly)


[Image: attachment.php?aid=1375]


MESSSS!?!?!


[Image: attachment.php?aid=1376]


Quick Video of him running on his chain drives and also new center omni wheel, which is Mr Baddeleys original design.




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2
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#2
Really nice!
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#3
Great job!
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#4
I wonder if this can be done with the MKIII drive frame?
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#5
im not sure, i would think its harder considering the indented gear slots. i have now had these running for at least 5 months, and at an event last night with carpet, decking, and tiles and performed very well.
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#6




(05-06-2019, 12:50 PM)Luc Wrote: im not sure, i would think its harder considering the indented gear slots. i have now had these running for at least 5 months, and at an event last night with carpet, decking, and tiles and performed very well.

The gear or the chain conversion?  I just recently installed the chains on the MKII and love them, my only problem is with some toe out that I can't seem to eliminate.  I was thinking of printing the MKIII, but would like to keep the chains since I already spent the money.
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#7
sorry i meant the indents in the sides for the printed gears, i think the chain needs a flat side to go from the motor sprocket to the main wheel sprocket. im sure anything is possible. whats a toe out problem mean? maybe this can be solved somehow. post some pics or video and lets troubleshoot
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#8
I'm thinking I might need to try something like this. I gave the new mkiii gear option a try and the left side binds up so bad that R2 no longer moves...just spins.
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#9
(05-11-2019, 11:47 AM)Luc Wrote: sorry i meant the indents in the sides for the printed gears, i think the chain needs a flat side to go from the motor sprocket to the main wheel sprocket. im sure anything is possible. whats a toe out problem mean? maybe this can be solved somehow. post some pics or video and lets troubleshoot

The right and left wheels are aligned like this \  / however not as exaggerated, so when it moves forward the splay out and vise versa in reverse.  I put a wedge in between the ankle and frame to compensate and it helped a lot.  I may just have to reprint the frames or install an insert because too much pressure was applied to keep the belts tight and it ovaled one side of the main drive wheel axle.
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