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#1
11-12-18, 19:21
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On another tack.... someone mentioned that the Corrector had a habit of turning as the gun traverses. Ours does the same.... we are now pretty sure we know why this happens, and that it is deliberate. If anyone is interested let me know, I'm happy to explain.
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#2
20-12-18, 16:09
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Another new question... we have to replace or retemper the set of balance springs that support the weight of the barrel when it is elevated. [They are housed in the two cylinders that sit below the barrel]. Unfortunately, we dont know how 'springy' the springs should be. I gather this is expressed in engineering terms as the 'spring rate' and is the weight required to compress the springs by one inch.
Does anyone have any technical info about the characteristics of these springs, especially the spring rate value ?
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#3
20-12-18, 18:14
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I can't say for sure in British gun terminology, but in North American terminology they are equilibrator springs. Basically you tension them until you have easy, almost balanced, elevation from level. Since there are two in this case, you will balance them left to right.
I was just involved in doing this with a M109 the other day, although they are equilibrated by hydraulic/nitrogen pressure. If you need to know the length of new springs, I believe I have some at home, and there may even be one or two kicking around this museum.
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#4
21-12-18, 15:40
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Hi Rob, many thanks for your reply.
Unfortunately... the springs in our equilibriator are already adjusted to the maximum possible, and still dont balance the weight of the barrel. Hence they need to be retempered or remade... but we of course need to know the spring rate to temper or construct them to. Any chance you could place a known weight onto a spring (held vertically) and measure the displacement ? We could work out the rate from that. As is the way of things I cant offer much by way of returning the favour.... though if your gun has the Bofors Speed and Course Sight fitted (as does ours) then I can share with you our discoveries about how it is used... Thanks and best regards Richard
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#5
16-03-19, 13:24
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General update about the Bofors at The Shuttleworth Collection in the UK. ....
.... after much huffing and puffing we successfully removed the six balance springs from the gun, discovering along the way that one was broken. Our friendly spring factory says that they cannot be retempered (as they cant tell what material they were made from or how they were made in the first place), and also says that they cant make new ones using rectangular-section strip. So... does anyone know of a source of unused balance springs, or has anyone successfully made replacement springs from round section strip ?
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#6
17-12-23, 21:36
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