REXEM - Roesner's EXperimental Earth Movers - the king of earthmovers

In 2010 I finally started to build my dream machine, a radio control motor grader. From childhood onwards, this was the most fascinating earthmover to me. So of course I wanted to build a radio control version when I became older and had access to a basic workshop. But the challenge to go beyond the relatively simple kitbashing and aluminium chassis I had built previously, was immense and it took several years of preparation, reading forum posts and then some planning in CAD to feel ready. I wanted to do as much as possible myself with simple tools: A drill press (pillar drill), a vise, an electric jig saw, a soldering iron and an assortment of hand tools - and hours spent on ebay trying to find the parts I needed.



I set out to implement all functions of a full size grader, using electro-mechanical drives - no hydraulics, which is a bit ironic, considering how much my job deals with hydraulics. Projects like this are never finished, but in 2012 I had completed what I believe to be the first fully functional 6x6 model grader. Over the next years I gradually upgraded every part of the grader and currently (2019), I am working to take the mouldboard level control from proof-of-concept to fully operational, including a new front end for the grader.
These are the functions, operated by two modified Turnigy 9x radio transmitters:

1. forward/reverse (6x6 with torque-balanced tandems)
2. steering
3. frame articulation
4. front wheel lean
5. left circle lift
6. right circle lift
7. circle float left on/off
8. circle float right on/off
9. circle sideshift
10. circle rotation
11. mouldboard angle of attack
12. mouldboard sideshift
13. saddle rotation clamp on/off
14. front blade up/down
15. rear ripper up/down
16. remote selection of mouldboard level control scheme (WIP)
17. automatic brake and reversing lights plus manual light switch for main lights

After buying a 3D printer, I have now also started a 1/32 scale fleet, including so far a grader and an 8x8 wheel dozer. You can see the machines on my youtube and instagram.