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Seperating an Angel RS600 Mast
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hollandsd View Drop Down
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Posts: 853 		Post Options Post Options   Quote hollandsd Quote  Post ReplyReply Direct Link To This Post Topic: Seperating an Angel RS600 Mast
    Posted: 10 Dec 09 at 8:57pm
Righty guys.

I have a fused 600 angel mast that i want to "unstick" i dont want to try the musto trick of tying one end to a car and another to a tree ( i dont want to damage my car or anyonelses)

I have tried putting ropes through both holes and ratcheting them apart but to no avail, also tried pouring hot and then boiling water over the join and no luck.

I have a spare bottom section, is dont mind wrecking the bottom section thats fused in the mast so is there any way of removing it either destroying the old bottom section or keeping it whole.

I have run out of ideas.

Dan
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Contender 541 View Drop Down
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Posts: 1402 		Post Options Post Options   Quote Contender 541 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 09 at 8:00am

Now you are going to have to trust me on this one...............

Tension and Time and Coca Cola

Find somewhere you can put the mast horizontal and then tension (lots of - so use a pulley mechanism) one end away from the other.

Now for the trust bit.  

Pour a can of Coke into the join and wait.  Coke is very corrosive and (should) eat the corrosion before the base metal.

 

I have seen this done with a vintage pillar drill that had been left out in the elements for 25 years - it took 4 weeks for the coke to do it's stuff, but......... 

Key thing with all seizures is once it moves a small amount it will continue to move - you need patience and lots of it
When you find a big kettle of crazy it's probably best not to stir it - Pointy Haired Boss

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tmoore View Drop Down
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Posts: 880 		Post Options Post Options   Quote tmoore Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 09 at 1:00pm
whatever you do, do NOT use WD40, it will weaken your mast, tension and time will likely give you the best results
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 09 at 6:10pm
Assuming its one with the alloy sleeve then heat is, I believe, the wrong way to go, I think alloy expands more than carbon laminate.
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Posts: 1402 		Post Options Post Options   Quote Contender 541 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 09 at 8:58pm

Originally posted by JimC

alloy expands more than carbon laminate.

And there is the problem in a nutshell - Dissimmilar materials!

Carbon Vs Alloy - not a good mix.

As I say in my previous post - Time and patience
When you find a big kettle of crazy it's probably best not to stir it - Pointy Haired Boss

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Jamie600 View Drop Down
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Posts: 718 		Post Options Post Options   Quote Jamie600 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 09 at 12:05pm

 

I've separated the ali mast heel from the mast by freezing the bottom section, as the ali will contract more than the carbon. We are due some cold weather soon so it might be worth giving it a try first thing in the morning after it's been frosty before it warms up again.
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Jamesd View Drop Down
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Posts: 377 		Post Options Post Options   Quote Jamesd Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 09 at 2:49pm
carbon and alloy?
you are right, the alloy will expand more, under heat (plus i would recommend more heat than boiling water anyway, but that is irrelevant).

Freezing it might be worth a shot

The coca-cola is the best idea! or use a release agent of some time. But instead of using a tension method, try and use a torsional force, it will be faster. see if there are two holes in the mast somewhere, i.e. the shrouds or trapeze fixings, stick a long bolt through it, clamp the other end and then apply a torsional load to it. pour the release agent over it and leave it. then after a while reverse the direction of the torsional force. shouldnt take too long.thats how i would do it if it was me, but then i dont really know what it is you are dealing with hahaha.
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Posts: 1314 		Post Options Post Options   Quote Neptune Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 09 at 3:32pm

If its anything like the superspars 600 mast then you can't twist the lower section until they are quite well seperated.  There is a quite inside the mast to stop the sections rotating in use.
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I luv Wight View Drop Down
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Posts: 628 		Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 09 at 4:08pm
Another way is to dissolve the aluminium ( using a more powerful chemical than the slightly acid in coca cola ). Warning - this can be very dangerous!!!  
Use caustic soda ( drain cleaner ) crystals dissolved in water. This eats the aluminium away, and can get very hot - so be careful! There was a home-made cherub carbon mast stuck on an alloy mandrel, the caustic soda got so hot it boiled and there was a fountain of boiling soda and hydrogen gas coming out of the top of the mast.

It worked though, with no damage to the carbon/epoxy.

http://www.bloodaxeboats.co.uk
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RS600653 View Drop Down
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Posts: 12 		Post Options Post Options   Quote RS600653 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Dec 09 at 5:14pm
Originally posted by Jamie600

 

I've separated the ali mast heel from the mast by freezing the bottom section, as the ali will contract more than the carbon. We are due some cold weather soon so it might be worth giving it a try first thing in the morning after it's been frosty before it warms up again.

iIve got a similar problem with my 600 mast so it's good to see that i'm not the only one with this problem! 

But I'm a bit confused by the post quoted above, surely if the ali contracts more when it's cold than carbon it will result in a tighter grip on the carbon?



Edited by RS600653
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