A 2mm Workhorse
or "yet another part-complete loco!"
At the excellent 2mm Golden Jubilee Expo in Oxford last July, I bought one of the Worsley Works etches for an 02 shunter. Of course, I then put the packet in the cupboard and forgot about it while I got on with some other modelling. The real things look like this:
Anyway, after a few months, the kit came to the top of the pile again and I decided to make a start on it. The etch comes complete with a simple etched chassis which i decided to discard in favour of using milled pcb frames with brass spacers and with an integral gearbox.
The chassis outline was drawn up on AutoCAD using the dimensions taken from the etch parts and with a gearbox design courtesy of Missy. I decided to use a Nigel Lawton 'midi-motor' (this seems shorter (and substantially cheaper!) than the Faulhaber 0816 which was the motor I'd originally intended to fit. By playing around on CAD, I got to a design which I felt would work and which would allow me to use the footplate from the original etch with minor modifications hacking.
Two small pieces of 0.5mm pcb were then set up on my Proxxon mill, the axle/gear positions drilled and the frame outline milled out.
After reaming out the holes to take the bearings (phosphor bronze soldered in from the inside of the frames), I bolted up the frames with temporary spacers and gears on turned plastic muffs supported by a selection of handy drill bits to see if it would work....
... and it did B) !
The frame spacers in the photo are a terrible bodge - milled brass blocks (to get some weight low down in the mechanism) will be used, tapped and screwed to the side frames, and the main frames gapped around these to prevent the whole lot shorting out. I intend using the 'Simpson' springing method to improve the current pick-up, but for now progress has stalled while I order some drills and other bits (which I forget to get at the weekend when I was at the Watford show ). There is still plenty of work to do, but I think the hard bit has been done.
And after this one, there are another 3 shunting locos to do!
Andy
- 2
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