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A childhood dream becomes reality
I’m having a tough time aligning the drive motor and wheel.  How did you figure out the alignment?  Also, did you do anything special to get the bearings to sit on the threaded rod?  I have a 5/16” threaded rod, but the bearings are 8mm (slightly bigger). So I put some heat shrink on the rod where I thought the bearings would go.  Then I have tried to mount the axle where the drive wheels align.

Hello Eebel,

the alignment is a real patience and takes a while. I first mounted the wheels. I use an 8mm threaded rod so that the 8mm ball bearings fit perfectly. In Germany have metric units. 5/16 "are only 7.9375mm, because the 8mm ball bearing is a bit too big, maybe there are also 5/16" ball bearings? These would then fit perfectly on your threaded rod. Otherwise, your idea with the shrink tube is not bad at all. Then I mounted the engine and mounted the drive belts. Then run the engine at low speed, loosen the engine mounting bolts and align the engine running until the drive belts do not jump off the pulleys. Tighten the engine screws again.

It is also important that the drive belts are not too tight. When assembled, they should be rotated a quarter turn to the left and right. I hope this helps you further.
Thanks. I’ll try again with your instructions. I’ll see if I can fin 5/16 bearings. I think that will help. The shrink wrap works. However, it’s very difficult to get the bearings in the right spot.

For my wheel/motor alignment I ended up having to create some thin 1mm spacers to fit between the geared pulley and the wheel.

After a long summer break I am back to the R2 project.

I have rebuilt the drive on single belt and have to say that is much better than the double belt solution.
Now my R2 unit is on its own feet for the first time. Big Grin 

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... to be continued!

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Getting him on his feet is a major milestone.


Since my R2 device is now on his own feet, I have used the holidays and printed the battery boxes of Martyman.
In my opinion, the design is absolutely brilliant.

The 3D printing worked well and after a few small sanding works everything works perfectly.

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It took about 3 days to build the box.

However, I can not explain the function of the two parts Blank.stl and BatHolder.stl.

What are these parts for?

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