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Paramedic View Drop Down
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    Posted: 10 May 21 at 7:12am
Originally posted by Sam.Spoons

Originally posted by Paramedic

Is it even a custom extrusion?

I'd be pretty surprised if it wasn't a stock tube...

That a what i'm thinking. So all the talk of die wear is irrelevant. Its not going to be extruded to especially high tolerances but on then flip side once these tolerances are exceeded the die will probably be replaced and because they are making kilometres of the stuff its not a financial drama to do this.
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 21 at 7:43pm
Originally posted by Paramedic

Is it even a custom extrusion?

I'd be pretty surprised if it wasn't a stock tube...
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Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 21 at 11:01am
Nominal is ~ 1.5mm thickness so +/- 0.4 is biig for boat spars. I think you can influence the range by replacing dies more often but that adds cost.
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 21 at 8:55am
https://youtu.be/P8BWQBP4Vhk
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 21 at 7:12am
Thatís from the EN standard and I would say it would be hard to improve on. Only ever seam the process once but pretty awesome. A very long hall, the extrusion comes out of the die very fast, at some point a sled grabs it pulls it to stretch it and cuts it. All very fast, it is a high volume process. 
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Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 8:37pm
Is it even a custom extrusion?
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 8:26pm
Too late to do the maths but +/- 0.4mm looks like the tolerance for the diameter of laser masts 

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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:56pm
https://www-bwcgroup-co-uk.cdn.ampproject.org/v/s/www.bwcgroup.co.uk/extrusion-academy/aluminium-extrusion-tolerances?amp_js_v=a6&_gsa=1&hs_amp=true&usqp=mq331AQHKAFQArABIA%3D%3D#aoh=16205036934731&referrer=https%3A%2F%2Fwww.google.com&_tf=From%20%251%24s&share=https%3A%2F%2Fwww.bwcgroup.co.uk%2Fextrusion-academy%2Faluminium-extrusion-tolerances
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:39pm
Anodising is protection against corrosion it is heat treatment that controls the mechanical properties but it wonít account for the weight differences.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:31pm
Originally posted by tink

Extrusion dies are about 3K and will do a lot of masts before they wear out. The †on cost to the sailor for good quality control will be minimal. †

You obviously know more about this than I do, but if, say, you halve the acceptable range of wall thickness for the spars then won't you also approximately halve the life of the die before it produces sections that are out of spec?
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