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Sheared screws in mast step |
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Gordon 1430
Far too distracted from work Joined: 27 Jun 17 Location: Lee on Solent Online Status: Offline Posts: 310 |
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Topic: Sheared screws in mast step Posted: 17 Jul 19 at 7:57am |
Hi Wobble Sorry don't know FF very well can you bolt it down instead of screws?
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Gordon
Phantom 1430 |
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craiggo
Really should get out more Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
Post Options Quote Reply Posted: 17 Jul 19 at 7:57am |
Get hold of a thread extractor. They are a tapered drill with a reverse thread. You start a small hole in the top of the broken screw and then drive the extractor in. At some point it will bite and wind the remnants of the screw out.
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OK 2129
RS200 411 |
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 17 Jul 19 at 9:08am |
Do not buy one off facebook, the set I bought was not very expensive (under a tenner) and totally useless, the drill end blunted in a second and the reverse thread smoothed off even faster. Test with a file to see if it's properly hardened , if it bites send it/them back.
Also remember that the odds of it working on the shaft of a screw is slim at best even if you get a decent one. If the screw is well enough stuck to shear then it'll need a fair bit of grip to remove it so go in with plenty of heat before attempting.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Wobble
Groupie Joined: 26 Jul 10 Online Status: Offline Posts: 44 |
Post Options Quote Reply Posted: 17 Jul 19 at 9:45am |
Gordon, nowhere to bolt to, as there's no opposing face to tighten against. These screws go into the meat of the hull spine. I've used a thread extractor on an engine bolt before, but never on a screw. I have my doubts that they would work, given how fast the screw stumps are. I'm going to take some time next week to look at the boat more closely, and decide what to do then. I don't think it's a killer problem -- just want to do the best job possible.
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mole
Groupie Joined: 02 Feb 06 Location: United Kingdom Online Status: Offline Posts: 43 |
Post Options Quote Reply Posted: 17 Jul 19 at 10:33am |
Hi
the hardest part is drilling the stainless screw. Ideally you need to flatten the top of the screw and use a centre punch before starting to drill. A small drill will be required to start, with stainless use constant pressure and fairly low rpm and some form of lubrication. If you don't the metal will work harden and the drill bit will soon become blunt. Obviously be careful of too much pressure and breaking the drill It maybe the full removal, and repositioning would be the best bet. Maybe consider using another suppliers mast step with different hole positions? Hope you get it sorted cheers
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 17 Jul 19 at 3:09pm |
What might help is a left handed drill bit.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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yottiemad
Newbie Joined: 24 Aug 14 Online Status: Offline Posts: 13 |
Post Options Quote Reply Posted: 17 Jul 19 at 3:16pm |
I had the same issue in an FF, no one to blame but myself as I fitted the hull out from new. I never tried to get the broken screws out, my screws had been installed with epoxy as lube/sealant from new so no extract tool would get them out. Just re drill the the alloy mast heel when it is removed, counter sink holes and put screws a size larger in different positions. It is an FF, a couple of grams in the hog will not make the boat over weight.
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Moomin.W
Newbie Joined: 17 Jul 19 Online Status: Offline Posts: 1 |
Post Options Quote Reply Posted: 17 Jul 19 at 3:42pm |
Just a different approach for removal which is easier than drilling out. Use a small cutting disk in a dremmel to cut a slot on the top of the screw shank. You'll cut into the surrounding wood but only a slot and it helps stabilise the cut on the screw. Then use a flat head driver to unscrew.
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 17 Jul 19 at 3:46pm |
Or use a 'drummer'
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Chris Robinson
Newbie Joined: 02 Oct 07 Location: United Kingdom Online Status: Offline Posts: 2 |
Post Options Quote Reply Posted: 18 Jul 19 at 8:37am |
https://youtu.be/dJfkCj3FWBs
This guy looks like he may have the answer. You may have to search to find the right tools though. |
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