Extracting broken screws from rotomolded hull :: Catamaran Sailboats at TheBeachcats.com

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Extracting broken screws from rotomolded hull

motogon

Rank: Lubber

Registered: Jun 28, 2011

Last visit: Aug 06, 2013

Posts: 40
Posted: Jun 28, 2011 - 04:16 AM

Hey guys!

I have little problem with "new" to me Hobie Wave. Two screws that holding rudder mounts broken. Any idea how to extract them without damaging hull?

Thanks,

Andrew

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Andrew
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A lot of great surfers were ruined by family and steady job.
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popeyez7

Rank: Mate

Registered: Apr 26, 2004

Last visit: Nov 05, 2024

Posts: 399
Posted: Jun 28, 2011 - 04:48 AM

~~ SAWSALL~~ ok, sorry bout that... just being funny!!!! How did that happen??? HMMMMMM ?? I use "Bosch" titanium drill bits. They work the best for me...... drill into it and try a 'easyout'..... that might be yer best bet. Someone else could chime in here...
Andrew ~~~ welcome to the cat club !!!!!!!!

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~ Vietnam Vet 69-71~ 17 Hobie w/big jib, ~18 Hobie mag,~DN Ice sailor,
and other toys.......
~~ I live in NY state on the north shore of Oneida lake in
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tami

Rank: Mate

Registered: Mar 25, 2002

Last visit: Sep 27, 2012

Posts: 187
Posted: Jun 28, 2011 - 06:18 AM

Extract with tool as mentioned. If the holes should wallow, then use West Systems' G-Flex to repair. FOLLOW THE DIRECTIONS, INCLUDING THE HEAT/ALCOHOL TREATMENT.

G-Flex is the bomb. I've used it to repair plastic extrusion on a furler for my trimaran.

You don't have to take my word for it
http://www.westsystem.com…-chainsaw-kayak-massacre
motogon

Rank: Lubber

Registered: Jun 28, 2011

Last visit: Aug 06, 2013

Posts: 40
Posted: Jun 28, 2011 - 06:31 AM

Is there some kind of inserts or those screws just screwed into plastic body? Is heating that area with heatgun may help to extract screws or this is bad idea?

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Andrew
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A lot of great surfers were ruined by family and steady job.
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motogon

Rank: Lubber

Registered: Jun 28, 2011

Last visit: Aug 06, 2013

Posts: 40
Posted: Jun 28, 2011 - 06:36 AM

popeyez7How did that happen??? HMMMMMM ??

I dont't know, I bought it like this.

popeyez7Andrew ~~~ welcome to the cat club !!!!!!!!

Thanks!

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Andrew
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A lot of great surfers were ruined by family and steady job.
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motogon

Rank: Lubber

Registered: Jun 28, 2011

Last visit: Aug 06, 2013

Posts: 40
Posted: Jun 30, 2011 - 06:34 AM

As I always say: if something could go wrong, it would. Extractor broken inside of that screw. I guess I have to drill out that bolt completely and try to thread for bigger size bolt.

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Andrew
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A lot of great surfers were ruined by family and steady job.
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DamonLinkous

Rank: Administrator

Registered: Jul 19, 2001

Last visit: Feb 04, 2025

Posts: 3453
Posted: Jul 02, 2011 - 12:13 PM

motogonAs I always say: if something could go wrong, it would. Extractor broken inside of that screw. I guess I have to drill out that bolt completely and try to thread for bigger size bolt.

Sounds like how my repairs usually go.

Is that the port or starboard hull? If it's the starboard and you completely screw it up you could get a brand new one here.
http://www.thebeachcats.c…wave-starboard-hull.html

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Damon Linkous
1992 Hobie 18
Memphis, TN

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**unknown user**

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Posted: Jul 02, 2011 - 08:49 PM

A friend of mine who works on power boats had similar problem Get a left handed bit it will back out on its own enough to grab with a vice grip and twist out
Edchris177

Rank: Chief

Registered: Nov 26, 2009

Last visit: Aug 10, 2024

Posts: 2531
Posted: Jul 03, 2011 - 06:53 AM

Get some advice from a good machine shop. The problem you now have is 10 times worse than what you started with.
The easy out snapped because they are brittle, meaning hardened steel, way harder than the screw you were originally trying to back out. It is very difficult, using a hand held drill, to drill the easy out. The bit is going to want to wander off to the softer metal surrounding the easy out.
You might have to remove the entire fitting, then file the stump square & turn it with vice grips.
Those screws that may be corroded in place are generally easier to drill at nearly the full diameter of the screw shank, then run a tap through the hole, cutting new threads through any corrosion. The remains of the old screw will generally come out as you cut.

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Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
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motogon

Rank: Lubber

Registered: Jun 28, 2011

Last visit: Aug 06, 2013

Posts: 40
Posted: Jul 05, 2011 - 06:22 PM

I fix it last week: used center punch to break easyout for pieces, drill out bolt completely, and tap new threads. It was bad idea to use easyout. Hobie used aluminum inserts in hulls which is bad design: aluminum + stainless steel + sea water=corrosion. There is no way to extract that old bolts, only possibility is to drill them out completely.
Thank you all for your advises!

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Andrew
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A lot of great surfers were ruined by family and steady job.
--
Edchris177

Rank: Chief

Registered: Nov 26, 2009

Last visit: Aug 10, 2024

Posts: 2531
Posted: Jul 05, 2011 - 07:49 PM

Good to see you solved the problem, & that it didn't cost a fortune. The Wave is not a Nacra, but they are still lots of fun. I've spent quite few days on them in Antigua & Barbados.
If you don't weight to much, & sail solo, you can get them to fly a hull.

--
Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
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