Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 13-01-2018, 20:13   #1
Registered User

Join Date: Sep 2016
Location: Chesapeake southern new jersey
Boat: Eastward ho 24 Downeaster 32
Posts: 183
Silicon Bronze chainplate reassurance....

My old chain plates were ss 1/4 inch thick by 1 1/2 wide by 26 inches long. I made bronze ones from silicon bronze from online metals. They’re the same size but instead of 1/4 inch they’re 3/8 inch thick. I know I’m “supposed” to use forged bronze, I assume the 3/8 bronze sheet I got is not forged. So am I gonna be ok with these?i checked the specs for it it’s pretty close to 304 , other then the elongation I think was 13% vs 30%. After drilling the holes and bending it I was supprised how easily it bent and drilled and had me second guessing it. Any one care to weigh in?
__________________

__________________
Eastward ho 24 is offline   Reply With Quote
Old 13-01-2018, 20:57   #2
Registered User

Join Date: Jun 2010
Location: Easton, MD
Boat: Catalina 22 Capri
Posts: 1,152
Re: Silicon Bronze chainplate reassurance....

Quote:
Originally Posted by Eastward ho 24 View Post
My old chain plates were ss 1/4 inch thick by 1 1/2 wide by 26 inches long. I made bronze ones from silicon bronze from online metals. They’re the same size but instead of 1/4 inch they’re 3/8 inch thick. I know I’m “supposed” to use forged bronze, I assume the 3/8 bronze sheet I got is not forged. So am I gonna be ok with these?i checked the specs for it it’s pretty close to 304 , other then the elongation I think was 13% vs 30%. After drilling the holes and bending it I was supprised how easily it bent and drilled and had me second guessing it. Any one care to weigh in?
Should be good to go for hundreds of years. For all practical purposes it has a near infinite fatigue life. It has stood the test of time so I like it even better than titanium.
__________________

__________________
kmacdonald is offline   Reply With Quote
Old 13-01-2018, 21:22   #3
Marine Service Provider
 
boatpoker's Avatar

Join Date: Nov 2008
Location: Toronto, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 2,730
Re: Silicon Bronze chainplate reassurance....

If I were to survey your boat, I would find no fault with those.
__________________
That hysterical laughter you hear as you sail a way in your "new" boat ..... is the seller.
boatpoker is offline   Reply With Quote
Old 14-01-2018, 07:03   #4
Registered User

Join Date: Sep 2016
Location: Chesapeake southern new jersey
Boat: Eastward ho 24 Downeaster 32
Posts: 183
Re: Silicon Bronze chainplate reassurance....

Well that’s good to hear.the ease of which it’s machined , cleaned , and bent had me nervous. Can’t see why any one would want to messs with ss compared to bronze. I wasn’t sure if it would cut on a plasma cutter , but it cut it nice and straight with no problems and it drills easily with a cobalt bit. I drilled 24 holes with one bit . The ss killed my 20$ bit after 2 holes.
__________________
Eastward ho 24 is offline   Reply With Quote
Old 14-01-2018, 09:50   #5
Registered User

Join Date: Mar 2015
Posts: 147
Re: Silicon Bronze chainplate reassurance....

My experience drilling Stainless has taught me that a sharp bit, oil and steady consistent pressure are needed to keep the drill bit cutting and prevent the Stainless from work hardening.
__________________
guyrj33 is offline   Reply With Quote
Old 14-01-2018, 09:59   #6
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,509
Re: Silicon Bronze chainplate reassurance....

They don't need to be forged. BTW, 3/8" isnt sheet, it's called plate. Good job, I wold have went to 3/8 also. More bearing area for the pins.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 14-01-2018, 13:25   #7
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,560
Re: Silicon Bronze chainplate reassurance....

Quote:
Originally Posted by guyrj33 View Post
My experience drilling Stainless has taught me that a sharp bit, oil and steady consistent pressure are needed to keep the drill bit cutting and prevent the Stainless from work hardening.


And slow speed, trick is to not generate heat.
__________________
a64pilot is offline   Reply With Quote
Old 14-01-2018, 18:21   #8
Registered User

Join Date: Sep 2016
Location: Chesapeake southern new jersey
Boat: Eastward ho 24 Downeaster 32
Posts: 183
Re: Silicon Bronze chainplate reassurance....

Thanks I’ll sleep better now. They sure are pretty
__________________
Eastward ho 24 is offline   Reply With Quote
Old 14-01-2018, 18:44   #9
Registered User

Join Date: Sep 2016
Location: Chesapeake southern new jersey
Boat: Eastward ho 24 Downeaster 32
Posts: 183
Re: Silicon Bronze chainplate reassurance....

I forgot to mention the carriage bolts that were there were facing inward so the squares are actually in the hull. I wouldn’t know any better but that doesn’t seem a sensible option in my head. So that leaves me with bronze hex cap bolts for mounting options. As much as I want to just put them in and sloop some caulk in there I’m thinking these holes need to be filled and re drilled or they’ll leak and creep up. Is this something I should be definitely concerned about?
__________________
Eastward ho 24 is offline   Reply With Quote
Old 14-01-2018, 19:19   #10
Registered User

Join Date: Jun 2010
Location: Easton, MD
Boat: Catalina 22 Capri
Posts: 1,152
Re: Silicon Bronze chainplate reassurance....

Put a round hole in the chainplate and a round bolt in it. DON'T make square holes in the chainplate. Carriage bolts are not suitable.
__________________
kmacdonald is offline   Reply With Quote
Old 14-01-2018, 19:47   #11
Registered User

Join Date: Sep 2016
Location: Chesapeake southern new jersey
Boat: Eastward ho 24 Downeaster 32
Posts: 183
Re: Silicon Bronze chainplate reassurance....

Yes I’ve done that I’ve made the round holes and they line up and I’ve dry fitted the chainplates. But the hull has the square holes in it from where they used carriage bolts. I guess I shave to fill these in?
__________________

__________________
Eastward ho 24 is offline   Reply With Quote
Reply

Thread Tools
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
Aluminum bronze vs silicon bronze keel bolts overtheseas Construction, Maintenance & Refit 18 05-03-2014 20:32
Need Reassurance ASIMPLELIFE The Sailor's Confessional 16 26-04-2011 05:28
need some advice or reassurance Islandmike Anchoring & Mooring 21 06-11-2008 09:50



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:00.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.