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Welding up old skin fitting hole waste


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Hello I’ve asked Marina to weld my kitchen and bathroom waste holes so how would I expect them to do it it’s just well square plates over it but it would look ugly or cut the actual hole in metal and fitted flush 

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3 minutes ago, Feeby100 said:

Hello I’ve asked Marina to weld my kitchen and bathroom waste holes so how would I expect them to do it it’s just well square plates over it but it would look ugly or cut the actual hole in metal and fitted flush 

 

I guess it depends on what you specify and what you are prepared to pay.

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Ha please 

yes I ask them and they said a small plate over 

I guess that the way they do them now no skill involved at all all the skilled tradespeople have long gone 

I will as how much to do property

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The hardest part is cutting the replacement disc.  PITA with an angle grinder and takes a lot longer than cutting a square.  Easiest way is to put the right sized holesaw, without the central drill bit,  in a drill press then feed it into a piece of well clamped steel plate, stopping frequently to clear the swarf from the cut.  This does not work holding the drill or the steel freehand.

N

Edited by BEngo
Delete spill checker dwarf, insert swarf!
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5 minutes ago, BEngo said:

The hardest part is cutting the replacement disc.  PITA with an angle grinder and takes a lot longer than cutting a square.  Easiest way is to put the right sized holesaw, without the central drill bit,  in a drill press then feed it into a piece of well clamped steel plate, stopping frequently to clear the swarf from the cut.  This does not work holding the drill or the steel freehand.

N

 

 

I think I prefer "clearing the dwarf from the cut"

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28 minutes ago, Alan de Enfield said:

 

 

I think I prefer "clearing the dwarf from the cut"

I wonder if Land and Water have a special dredger for that? CaRT would no doubt oppose it, as it would reduce their visit numbers.

 

 

N

 

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33 minutes ago, Alan de Enfield said:

 

 

I think I prefer "clearing the dwarf from the cut"

I think you can buy Dwarf Magnets that may do the job, but they are all red.

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2 hours ago, Feeby100 said:

Hello I’ve asked Marina to weld my kitchen and bathroom waste holes ...

 

 

Have you thought about all that waste water which will drain into your bilges once the hole is blanked off? 😋

 

Seriously, if it's above the waterline and you're not getting it done because it's badly corroded, etc,, then I wouldn't even bother - as long as the skin fitting was fitted properly in the first place. I blanked off an unused 3/4" skin fitting by smothering a plastic wine bottle cork in PU sealant and pushing it into the fitting! A perfect tight fit. It might be a small bodgeola but it works fine. That was over 10 years ago and it's still solid and sealed. Obviously anything below or close to the waterline needs to be properly welded.

Edited by blackrose
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I have used a washer sandwich and some sealant on mine. Large washer each side and 3 smaller washers to fill in between that fit the hole with a stainless dome head bolt through the middle

 

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I did some on my other boat by cutting circles with a hole saw then welding in flush and grinding smooth. I only welded the external side as they were well above the waterline.

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3 hours ago, Feeby100 said:

Mm good idea would the brass be ok to use won’t react with the steel 

Well, my boat's 20+ years old with several holes in the hull and I haven't noticed any huge amout of rust - though I did put fibre washers  and mebe  a bit of gunge to aid the sealing.

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When I re-fitted Helvetia, one of the sinks was removed, and Roger Farrington welded up the wastepipe hole. He cut a square hole round the original round one, which was a bit rusty around the edges, and made up a square plate of equivalent size. He tacked a strip of steel across the plate and then tacked that onto the hull, he welded the top and bottom edges of the plate onto the hull, removed the tacked on strip and welded in the the edges of the square plate, and grinding it all flat. It took him less than 30 minutes for the entire job.

 

 

Edited by David Schweizer
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