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Sheared screws in mast step
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Sam.Spoons View Drop Down
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Topic: Sheared screws in mast step
    Posted: 17 Jul 19 at 3:09pm
What might help is a left handed drill bit.
  
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mole View Drop Down
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Posts: 43 		Post Options Post Options   Quote mole Quote  Post ReplyReply Direct Link To This Post 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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Posts: 44 		Post Options Post Options   Quote Wobble Quote  Post ReplyReply Direct Link To This Post 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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Sam.Spoons View Drop Down
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post 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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craiggo View Drop Down
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Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post 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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Gordon 1430 View Drop Down
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Posts: 310 		Post Options Post Options   Quote Gordon 1430 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jul 19 at 7:57am
Hi Wobble
Sorry don't know FF very well can you bolt it down instead of screws?
Gordon
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Wobble View Drop Down
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Posts: 44 		Post Options Post Options   Quote Wobble Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 19 at 6:11pm
Good idea, thanks! I'll check to see if there's room for manoeuvre.
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jharvey View Drop Down
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Posts: 20 		Post Options Post Options   Quote jharvey Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 19 at 5:27pm
Is there any room to move the mast step forwards or backwards an inch and have 4 new holes?
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Wobble View Drop Down
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Posts: 44 		Post Options Post Options   Quote Wobble Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 19 at 11:33am
Thanks Sam and didlydon both. All a bit scary.

I'm thinking of taking a swerve and drilling two new holes in the mast step. It'll be a bit weaker, but the attachment to the boat a bit stronger, I reckon.
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didlydon View Drop Down
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Posts: 280 		Post Options Post Options   Quote didlydon Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 19 at 10:15am
If you can get in there to use a Dremel,  use a small diamond burr to "spot" it then gradually enlarge the burr keeping it on course till its gone. Patience & perseverance needed here!
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