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Sheared screws in mast step |
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Sam.Spoons 
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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 Topic: Sheared screws in mast stepPosted: 19 Jul 19 at 9:14am |
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That video is excellent, I didn't want to suggest otherwise.
I agree WRT the hole saw technique if all else fails, an elegant solution.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Chris Robinson
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Joined: 02 Oct 07 Location: United Kingdom Online Status: Offline Posts: 2 |
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Posted: 19 Jul 19 at 8:12am |
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I agree that the techniques shown in the video are above average boat bimbling level but the purpose of linking it was to show the methods for overcoming problems that others had mentioned. I would imagine that it would not be too hard to make a pre drilled plate which could be screwed into place and would then act as a jig to drill the sheared screws out.
Personally, I like the hole saw suggestion. Simple and effective.
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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 18 Jul 19 at 3:51pm |
Exactly. The guy in the (excellent BTW) video had it easy with all the tools including access to a lathe to make his drill guides, and sheared bolts with not a sign of corrosion. Not saying he was not skilled and a video of him waiting for penetrating oil penetrating would be worse than one of paint drying but....... If other methods fail then I too would drill oversize and use a plug of new wood too.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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423zero
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Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420 |
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Posted: 18 Jul 19 at 12:00pm |
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One inch hole saw, drill down side of screw, then glue in one inch Dowell, prefix mast foot in same place.
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 18 Jul 19 at 9:11am |
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The big trouble with these techniques is that they require skill, experience and practice. So if someone like me without those three attributes has a go the first few attempts tend to end badly. So in the trade you might give a youngster a scrap cylinder head to practice with. If the OP boat is wood I'd be thinking that my fallback would be to drill all round the screw to extract, then drill a large hole and plug it. New screw could then go in the plug.
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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 18 Jul 19 at 9:10am |
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The hardest thing to find will be the left handed drills (well, a lathe to drill the guide bolts, but I guess that's not relevant in this case), Amazon is you friend. Much easier with larger, and clean, un-corroded, bolts though
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Chris Robinson
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Joined: 02 Oct 07 Location: United Kingdom Online Status: Offline Posts: 2 |
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Posted: 18 Jul 19 at 8:37am |
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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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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 17 Jul 19 at 3:46pm |
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Or use a 'drummer'
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Moomin.W
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Joined: 17 Jul 19 Online Status: Offline Posts: 1 |
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Posted: 17 Jul 19 at 3:42pm |
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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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yottiemad
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Joined: 24 Aug 14 Online Status: Offline Posts: 13 |
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Posted: 17 Jul 19 at 3:16pm |
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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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