photography, engineering, tomfoolery

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 vice, 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.

The (never) Completed Grader in 2013

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 radio transmitters:
  1. forward/reverse
  2. left/right steer
  3. left/right frame articulation
  4. front wheel lean
  5. circle lift left
  6. circle lift right
  7. circle float left on/off
  8. circle float right on/off
  9. circle sideshift
  10. mouldboard angle of attack
  11. saddle rotation clamp on/off
  12. front blade up/down
  13. rear ripper up/down
  14. remote selection of mouldboard level control scheme
  15. automatic brake and reversing lights plus manual light switch for main lights
See a step by step documentation of the build The Build @ Flickr →
Buy my photos at Redbubble Videos and Discussion @ youtube →
other R/C stuff I have built over the years Other RC @ flickr →