Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 16-09-2010, 05:10   #1
Registered User
 
Scare_Rab's Avatar

Join Date: Nov 2009
Location: Otautahi, Aotearoa
Boat: Alan Pape. Ebbtide 33'
Posts: 104
Images: 5
Bow Roller with No Way to Capture Chain - How to Fix ?

I have TWO x bow rollers .. neither having any way to stop the chain "jumping off".

I have a windlass, that I only use when the chain is "Up_&_down" (to break her out)

Then I just haul her on up: quicker

Problem is - with no "pin_across_the_top" , to stop the chain rising upward, it frequently happens that the chain 'jumps out of roller, slips out, down across the gunnell and headds back toward my feet,
taking / grinding the gunnell as she goes.



As with most else, I've not found swearing too effective.

A massive heave forward _ up _ & _ Over again gets the chain back on the roller, and I'm back pulling chain, ready for the farce to repeat.

Ho Humm


Suggestions welcomed
Attached Thumbnails
Click image for larger version

Name:	boat 126.jpg
Views:	199
Size:	420.4 KB
ID:	19281  
Scare_Rab is offline   Reply With Quote
Old 16-09-2010, 05:25   #2
Registered User

Join Date: Dec 2009
Posts: 2,959
Images: 4
Maybe V-shaped rollers. Otherwise a visit to the local welder for some hoops or whatever.

Grinding the gunnels...ugh...that's brutal.
daddle is offline   Reply With Quote
Old 16-09-2010, 06:17   #3
Nearly an old salt
 
goboatingnow's Avatar

Join Date: Jun 2009
Posts: 14,472
Images: 3
the whole thing looks light, the rollers should be at the bottom ofa deep "U" beam. or else get "cheeks" welded on.

Dave
goboatingnow is offline   Reply With Quote
Old 16-09-2010, 06:42   #4
Registered User

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 5,048
I agree--its hard to see from the pictures, but the only thing taking the load is the shaft of the roller as a cantilever--it would be best to start over, because if the anchor catches under a rock you are going to have several thousand pounds of load on the roller.
donradcliffe is offline   Reply With Quote
Old 16-09-2010, 07:13   #5
Eternal Member
 
capt_douglas's Avatar

Join Date: May 2003
Location: Ft. Lauderdale, FL
Boat: Vancouver 36 cutter????
Posts: 620
Send a message via Skype™ to capt_douglas
If the chain's too big for the rollers or the angle between roller and windlass is too great, you can get the chain to jump off. Also, I'd check that the roller assembly was very secure. Vibration and chain movement can set up some strange conditions.

You don't mention if you use nylon rode but as an experiment you might consider attaching some to the chain and trying that. If the nylon has the same problems as the chain then I'd look at angle differences (maybe canting the rollers to be more in line with the windlass). If you don't then I'd think the alignment is right and consider bigger rollers.

You might consider extending the ears on the rollers, fabricating a removable strap over each roller to keep the chain in place, consider going to larger rollers, or possibly repositioning the rollers (maybe a bit higher or forward). Another suggestion would be to get the roller modified so that the chain diameter matched the groove in the roller. That would help prevent excessive vertical movement and provide a better guide for the chain.
__________________
Capt. Douglas Abbott
USCG/MCA IV/M.I./C.I. 500-ton Oceans
capt_douglas is offline   Reply With Quote
Old 16-09-2010, 09:24   #6
Registered User
 
svHyLyte's Avatar

Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,958
Images: 25
Why not simply have a chain keeper made up of 1/8" or 3/16" plate and replace the axel bolts through the roller with threaded rods so you can use a wing nut to release the keeper when you need to? A bow roller is not designed for, and should not be subjected to, anchoring loads which should be carried by a snubbing line or bridle connected to you anchor rode and lead to deck cleats or a Sampson Post. You might have a chain keeper made up like:
Attached Thumbnails
Click image for larger version

Name:	Chain Keeper.jpg
Views:	177
Size:	403.0 KB
ID:	19286  
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline   Reply With Quote
Old 16-09-2010, 09:27   #7
Marine Service Provider
 
craigsmith's Avatar

Join Date: Jun 2005
Location: New Zealand
Posts: 407
Images: 4
Both those rollers are entirely useless, I would rip them both off and replace with a proper roller assembly set-up.

You don't need a pin across the top, you want deep cheek plates as Dave first suggested, plus wider rollers of a larger diameter preferably cut with sloping concave surfaces and a chain groove.

Bow roller assembly design (Rocna Knowledge Base)
__________________
Craig Smith
info on anchors & anchoring | Peter & Kiwi Roaís website
craigsmith is offline   Reply With Quote
Old 17-09-2010, 16:08   #8
Registered User
 
osirissail's Avatar

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
Check out this solution - Schaeffer boom bails. Available in most boat parts stores. Link: Wilkie's Sailboat Page
Attached Thumbnails
Click image for larger version

Name:	Br2.jpg
Views:	185
Size:	27.2 KB
ID:	19326  
osirissail is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bow Roller and Flying Anchor US1Fountain Anchoring & Mooring 6 02-08-2010 13:55
Questions on New Windlass, Bow Roller, Anchor Installation - Advice, Please ! Northeaster Anchoring & Mooring 11 11-04-2010 04:42
Bow Roller Construction wkd928 Anchoring & Mooring 11 27-02-2010 10:42
Bow Roller to the Side of the Bowsprit? Extemporaneous Anchoring & Mooring 5 12-11-2009 23:55
Intalling a New Bow Roller - Advice? Vic de Beer Construction, Maintenance & Refit 2 24-09-2009 09:18

Advertise Here


All times are GMT -7. The time now is 21:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.