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| Minnie on the cheap! |
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| NormanV:
Some more parts, the wheel rims. I can't understand why the castings for the rear rims are so expensive (£70)! They cost me next to nothing to cast them myself. The strakes on the hind wheels were a bit tedious to make but riveting them was fun. Also the wheel hubs and associated bits. The slots for the spokes are a bit rough, I made my own milling cutter, it didn't keep its edge, but it won't matter as the hub covers will hide it all. |
| krv3000:
hi brill work nothing rong with things dun with watt you have at hand |
| Pete W.:
--- Quote from: NormanV on August 19, 2017, 03:38:18 PM ---Pete, what sort of problems am I likely to have? I would have to buy the tin, I've got aluminium. --- End quote --- Have a look here: https://www.copper.org/resources/properties/microstructure/al_bronzes.html Oops, sorry, that's the wrong publication. Still, if you Google 'Copper Development Association', there are several publications on Aluminium Bronze. It's a bit near bed-time right now - I'll have a look for my hard copy tomorrow and post here again with the CDA publication number. |
| NormanV:
I gave up on the idea of making bronze castings for the bearings as I could not source any copper. Instead I thought that I would cast them in aluminium and sleeve them in a more hard wearing metal. The castings in my expensive plaster moulds were a failure. I believe that as the plaster was cold it caused the metal to shrink away from them. My precise sharp cornered patterns were translated into rounded cornered castings! What a waste of money, £12 for the plaster. |
| NormanV:
So instead, I fabricated to bearings in steel. I do not have any silver solder so I araldited the parts together. They look ok, remember, this is intended to be a display model rather than a fully functioning one. |
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