wakeup said:I was repeating what I was told by someone who worked at Woolwich from the late 1930s until Woolwich was closed in the late 60s. Going by your response we both agree about the painting/enamelling anyway. I didn't mention any timescale. So Sunbeams had a pre industrial revolution metal painting process?
I don't think I mentioned Norton (Burman) gearboxes at any stage. I was talking about AJS/Matchless gearboxes up to the early 50s, when apparently Norton, AJS and Matchless started having ever growing commonalties.
AMC acquiring a better painting system in the 1930s than the one they already had is hardly stopping outside suppliers, because of problems, for their own system ??
That was a very long time ago too.
And Burmans made all of Norton gearboxes from the early 1930s through to the end of the AMC gearbox in Commandos, as far as I was aware.
Doing your own gearcutting is a big step - and Burmans were very experienced at it.
At some stage, the gears did acquire a thicker tooth profile, to strengthen them - beware mixing and matching ?!!