Believe or not I lost sleep over this. I don't abandon builds (not yet anyway). I'm not one of those weak-willed, lilly-livered individuals with one of those defeatist shelf of doom things (that reminds me, I really should get around to getting a copy of 'how to win friends and influence people'). The various 'issues' kept nagging away at me as I work each of them through my skull porridge. Each one had more brain time allocated to it than Jehlik probably gave his whole design.
About three weeks after I'd abandoned it, I got the box back out of the cupboard and started again.
What on Earth Was Jehlik Thinking?' Corner.
We've already seen how the main roller would have faired with trenches, but there is another problem that Jehlik failed to predict:
Which proves that Mr.Mad is cleverer than Jehlik. That's a frightening thought isn't it?
Other than being a pretty effective trench-anchor, the silly little castors at the back were intended to be used for steering. They were supposed to be electrically powered, by that I mean powered steering, they weren't intended to help with with traction. I say 'castors' because they were intended to be rugby ball shaped, which proved to be a 'making the bloody things' problem. This is where I would have turned to 3D printing if that was an option. Failing that I resorted to 20th century technology and a hell of a lot of faffing about. First off, having drawn the profile on Inkscape, I printed more than I expect to need as the odds are I'll screw something up and need some more (which proved to be a very accurate assumption):
I used PVA to glue them to spare bits of lightly sanded, 1mm styrene from my scrap box:
And then do… erm.. this around a central tube:
Finally Milliput the gaps leaving me with very odd shaped balls:
The frame the castors are mounted on was also a 'How the hell am I going to do that' moment. At first I tried using thin brass sheet but it was much to flimsy. Fortunately a search through the shed of dreams junk came up trumps:
Incidentally, those Wiss heavy duty scissors are fantastic – it cut the metal sheet easily. The only downside was:
Straightening them out left me scarred for life. Who do I sue?
The first brass effort ended up being useful as I used it as a template to get the holes and bends in the correct position the very first time – which was a very welcome novelty.
Finally all tarted up:
I've screwed up the spacing of the treads but I doubt you'll even be able to see the silly little skates when they're fitted so I must remember to go back in time and not make that much of an effort next time. You may also notice that the pivot thingy goes through the frame and into the castor. That was to bear the weight of the monstrosity they're attached to and also because I could think of a way to get the joint strong enough if I didn't.
Next up: Who knows???*
* That's my effort to be mysterious. Yes I know I should try harder but it's only you and I feel that I can't be arsed to make the effort.
** If I say 'No offence' you are legally obliged to not take offence.