Holes and pin diameters should match - yes? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 05-12-2011
Senior Member
 
Join Date: Mar 2010
Location: SW PA
Posts: 101
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
oomfh is on a distinguished road
Holes and pin diameters should match - yes?

Had a new forestay made for a new furler. Provided the rigger with all necessary dimensions including pin diameters. The hole diameter in the upper toggle he installed is larger than the masthead pin.

Humor me a moment with this question, when it come to sailboat rigging - shouldn't hole and pin diameters always match?
Reply With Quote Share with Facebook
  #2  
Old 05-12-2011
Member
 
Join Date: Feb 2009
Location: Jupiter, FL
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
amarinesurveyor is on a distinguished road
Yes. If the pin is smaller diameter than the hole in the stay, it is a point load and will eventually start to elongate the hole.
Brian
Reply With Quote Share with Facebook
  #3  
Old 05-12-2011
Senior Member
 
Join Date: Apr 2003
Posts: 4,192
Thanks: 50
Thanked 37 Times in 36 Posts
Rep Power: 14
knothead has a spectacular aura about knothead has a spectacular aura about knothead has a spectacular aura about
Quote:
Originally Posted by oomfh View Post
Humor me a moment with this question, when it come to sailboat rigging - shouldn't hole and pin diameters always match?
In my opinion yes. Typically a hole is about 1/64" larger than the pin.
However, when I asked a Selden representative about this recently, I was told that they commonly will use a 14mm pin in a 16mm hole and they considered this appropriate.
I disagree but I'm in no position to argue.
Reply With Quote Share with Facebook
  #4  
Old 05-12-2011
SVPrairieRose's Avatar
Senior Member
 
Join Date: Oct 2009
Location: Vancouver BC
Posts: 227
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
SVPrairieRose is on a distinguished road
Would not be hard to use a bushing, except it is way up there!
Reply With Quote Share with Facebook
  #5  
Old 05-12-2011
Senior Member
 
Join Date: Mar 2010
Location: SW PA
Posts: 101
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
oomfh is on a distinguished road
Bushing may be the way to go

Got on the McMaster Carr website to look for a bushing, 3/8" OD, 5/16" ID and they have it, in three different grades of bronze! Unbelievable!

Fortunately we haven't raised the mast for this sailing season yet.

Thank you for all of the valuable input. "Load point" is the exact term I was looking for.
Reply With Quote Share with Facebook
  #6  
Old 05-12-2011
SVPrairieRose's Avatar
Senior Member
 
Join Date: Oct 2009
Location: Vancouver BC
Posts: 227
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
SVPrairieRose is on a distinguished road
Enjoy the season!
Reply With Quote Share with Facebook
  #7  
Old 05-12-2011
Senior Member
 
Join Date: Jan 2011
Location: Maine
Posts: 567
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 4
DonScribner is on a distinguished road
You (we) really need to fix that. (Mine is at the lower end). Think of it this way. I'll simplify and exaggerate. It it's 2" around the pin, then 1/2 of that, 1", is taking the load. If the there is 1000 lbs of tension on the forstay, that's 1000 lbs/inch. Now, make the pin too small, it's a point load of maybe 1/100". That means the load on that little point is 100,000 lbs/inch. That much pressure on any type of metal can cause problems. Most likely elogation of the hole or sawing into the pin, or both. Either way, a, $.89 bushing is worth the trouble.

BTW: A cute slim thing in high heels can generate 1000 PSI with each heel strike.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sailor Match.com bwalker42 Crew Wanted/Available 28 08-30-2010 08:08 AM
Ablative Paint Mix-N-Match DrB Gear & Maintenance 5 03-16-2009 02:47 PM
match 61 match61 Introduce Yourself 6 01-02-2009 03:21 PM
Annapolis match racing maestro General Discussion (sailing related) 0 06-11-2004 09:15 AM
So You Want to Be a Match Racer Dobbs Davis Racing Articles 0 10-21-2001 08:00 PM


All times are GMT -4. The time now is 06:34 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012