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 Tapping the goose neck		  New Topic  Topic Locked
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Initially Posted - 11/29/2003 :  17:39:38  Show Profile  Visit Frank Hopper's Homepage
Does anyone see any reason not to tap the cast aluminum boom end and using screws on the front of this block? I will use SS pop-rivets on the back. This is the Garhauer 25 double, it is too big but it will be ok.
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deastburn
Captain

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USA
334 Posts
Response Posted - 11/29/2003 :  17:51:25  Show Profile
I am no metallurgist, but aren't castings more brittle and fatigue-prone than extrustions? You are talking one half inch difference in the positioning of the block. Why not simply screw it into the boom a bit further aft and avoid the question altogether?
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/29/2003 :  18:15:07  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by deastburn</i>
<br />I am no metallurgist, but aren't castings more brittle and fatigue-prone than extrustions? You are talking one half inch difference in the positioning of the block. Why not simply screw it into the boom a bit further aft and avoid the question altogether?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
I haven't pulled the casting so I do not know how far into the boom it goes. I would guess 3/4 ". I figure I will need to be 1" back from the end of the casting, that puts the lead almost 4" back from the mast. I am concerned about getting as perpindicular to the mast base as possible so the outhaul isn't adjusted as the boom swings around. Maybe I am not visualizing it very well and it is no big deal.
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 11/29/2003 :  19:40:11  Show Profile
I've drilled and tapped a number of boom and mast cast pieces with no issues.
Edited by - OJ on 11/29/2003 19:44:58
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/29/2003 :  20:50:20  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by OJ</i>
<br />I've drilled and tapped a number of boom and mast cast pieces with no issues.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Thanks.
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eric.werkowitz
Captain

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USA
283 Posts
Response Posted - 11/29/2003 :  23:35:57  Show Profile
Frank,

"I am concerned about getting as perpindicular to the mast base as possible so the outhaul isn't adjusted as the boom swings around. Maybe I am not visualizing it very well and it is no big deal."

I think it's no big deal. While the line may experience some differing in tension as the boom swings, the length difference will be distributed over a long length. You'll never notice the difference.

Eric Werkowitz
C25 #4969
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 11/30/2003 :  00:36:15  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by eric.werkowitz</i>
<br />I think it's no big deal. While the line may experience some differing in tension as the boom swings, the length difference will be distributed over a long length. You'll never notice the difference.
Eric Werkowitz
C25 #4969
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
I bet your right.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.