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tink View Drop Down
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    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 
Tink
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423zero View Drop Down
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Posts: 3420 		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
Robert
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Posts: 789 		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 won’t account for the weight differences.
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JimC View Drop Down
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Posts: 6661 		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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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:10pm
https://www.anodisingnorthwest.uk/specifications
Robert
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:07pm
Would have thought any manufactured product would have to apply to a certain standard.
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:05pm
Who controls the quality of the extrusion? Who has any idea whether the mast is mid spec top bottom spec or out of spec? Has any customer ever seen this data-sorry if I was off hand on my last post -multi tasking after too much wine!
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Oatsandbeans View Drop Down
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 7:03pm
Who controls the quality of the extrusion? Who has any idea whether the mast mast is mid spec top bottom spec or out of spec? Has any customer ever seen this data-sorry if I was off hand on my last post -multi tasking after too much wine!
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tink View Drop Down
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Posts: 789 		Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 6:56pm
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. As I said above not arguing that there isn’t variations but that with controls there should not be. Not commissioned a new die for a while but have a recent quote for an ongoing project. 
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Oatsandbeans View Drop Down
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Posts: 382 		Post Options Post Options   Quote Oatsandbeans Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 21 at 6:31pm
Ok -well replacing extrusion dies will not come cheap. Has anyone got any idea of how consistent Al mast properties are apart from the mast manufacturer-no . I have compared two nominally the same Al masts and found them dramatically different. Now I don’t know much about Al , but I do know about composites and if you have good material and a good process you can get a very close control on the laminate properties.
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