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#1
11-04-17, 16:51
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Use of aluminum might be for weight, but it might also have been for lower melting point or ease of machining. Maybe a combination of "all of the above", I don't know the true answer.
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#2
11-04-17, 22:43
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The gearbox casing is quite likely to have been cast from Elektron, which was a magnesium alloy developed by a German company in the Inter War period. A company was formed in England in the early 1930's to produce Elektron castings. I know that the gun mantlet in the Vickers Mk6A was cast in this metal. It is light and stronger than cast iron. The gearbox casings on the Ferguson TE-20 tractor were cast in this metal and are part of the main spine of the machine, so on doubting the strength.
__________________
Richard 1943 Bedford QLD lorry - 1941 BSA WM20 m/cycle - 1943 Daimler Scout Car Mk2 Member of MVT, IMPS, MVG of NSW, KVE and AMVCS KVE President & KVE News Editor
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#3
12-04-17, 00:34
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I don't think it would have been a weight issue, although my trans is probably 6-8 times heavier. Looking at mine now, I think I could have cut down the general thickness and still retained it's strength. I think it would have been for ease of manufacturing. If I was capable of casting, then I probably would have gone with ally as well. But I'm still happy with my progress. I had and estimate of $10k just for the wooden plug then it would have to be cast and machined. So It would have been upwards of possibly $20k and still no guarantees.
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#4
12-04-17, 05:09
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Quote:
 Understatement? 
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#5
12-04-17, 06:17
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I have now had the gears in and checked for clearance and all is good.
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#6
12-04-17, 06:19
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I also put the side bearing housing and cross shaft for a test fit and that too is good and the bevel gears appear to mesh correctly.
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#7
12-04-17, 06:26
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Well that's it!! i've welded the bottom on so I hope I don't need to do anything else in there or I'll be cutting a hole
. Centre lines all lines up, the gears all mesh well and I can turn the main shaft and get the gears to respond so that's a plus. One of the bearing housings in the centre must have got a little bit too hot so I will have to do a bit of mods with my die grinder but no biggy. The outside wing parts are next then the holes and tapping.
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