Hobie Forums
http://www.hobie.com/au/en/forums/

screw that holds the pintles snapped and can't extract
http://www.hobie.com/au/en/forums/viewtopic.php?f=23&t=68384		 Page 1 of 1
Author:  georgeszlemp [ Tue May 25, 2021 8:22 am ]
Post subject:  screw that holds the pintles snapped and can't extract
Boy am I in trouble. One of the screws that holds the pintles which attaches the rudder snapped off. I tried to extract the screw but wasn't able to remove it without causing alot of harm. Now what can I do? The bolt which the screw goes into looks all messed up. I sure would like some options or guidance.

George in Florida
Author:  dorienc [ Tue May 25, 2021 11:16 am ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
Can you post a photo? I expect you can drill out the broken screw. Does it thread into a metal nut embedded in the hull? If so, when you've drilled out the broken screw, tap the nut and go up a size on the screw.
A good machinist or auto mechanic can do it if you don't have the tools.
Author:  tpdavis473 [ Tue May 25, 2021 11:50 am ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
If you don't have a damaged screw extractor set, get one from Amazon for 10 bucks or so and try extracting again. IF that doesn't work, then do what Bob suggested.
Author:  dorienc [ Tue May 25, 2021 1:34 pm ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
Oh! Thom reminded me. I got this type of extractor, and they are amazing. They fit into an impact driver (or drill) and work extremely well.
https://www.amazon.com/Extractor-Stripp ... 9381&psc=1
Author:  georgeszlemp [ Thu May 27, 2021 3:07 pm ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
Thanks for the advice but I'm in another situation after extracting the broken screw. I retapped the nut a size bigger as was mentioned and then the tap broke.
Must be a plan B solution as I sure could use more encouragement. I was soooo close to solving the broken screw and now this. Any enginneers out there with a plan. I will always be grateful for this site. I can't imagine getting the tap out.

George in Florida
Author:  tpdavis473 [ Thu May 27, 2021 6:11 pm ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
https://www.practicalmachinist.com/cutt ... oken-taps/

Don't do the tig welding! Also don't smash it because it will likely mess up the embedding.

Sorta confused as to why you decided to tap the nut if you extracted the broken bolt pieces.

Should just be able to extract the tap the same way you got rid of the broken bolt. Next time use sufficient oil to cut the tap.

Caution. IF you "unbed" this nut you will be in a world of hurt for your rudder since I don't know of a good way to rebed a nut in this plastic boat (one of the reasons I don't like plastic boats). If you do manage to unbed it, you might look into hollow wall anchors in stainless steel if there are such things, but I don't know how much load that they'd take and cutting that large a hole will be problematic in terms of a permanent leaking hull.
Author:  dorienc [ Fri May 28, 2021 10:39 am ]
Post subject:  Re: screw that holds the pintles snapped and can't extract
Get a tap extractor. They have 2 arms that fit into the cutting grooves of the tap and let you carefully back out the tap.

When you re-tap, like Thom says, use lots of cutting oil, and tap in 1/4 turn, then back out and clean out chips. Slowly, slowly, and let the tap do the cutting, don't try to make it cut. As you found, that snaps them off.

When I was a machinist years ago, I had to tap large cast iron pulleys for a 1" set screw. So many hard spots in that iron, I broke quite a few taps.

(Edit) did you drill out the hole to the proper size for a larger tap? There are charts that tell the base hole size for a given screw size.
Page 1 of 1 All times are UTC - 8 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/