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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 Topic: Ovington Laser
    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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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 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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Paramedic View Drop Down
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Posts: 929 		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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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: 09 May 21 at 7:12am
That’s 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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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: 09 May 21 at 8:55am
https://youtu.be/P8BWQBP4Vhk
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Daniel Holman View Drop Down
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Posts: 997 		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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Sam.Spoons View Drop Down
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Posts: 3400 		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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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post 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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rich96 View Drop Down
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Posts: 596 		Post Options Post Options   Quote rich96 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 21 at 10:32am
Just noticed that a Laser/ILCA 7 with covers, trollety etc will be near£7.5K

Initially a bit shocked but I guess its half of an OK or a quarter of a Finn now ?

So, despite the low tech etc its a very good buy to get racing ?

Remembering that in the 90s you could get one for £2K ish
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davidyacht View Drop Down
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 21 at 1:34pm
And in the 70s about £400!
Happily living in the past
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