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Go Back   SailNet Community > On Board > Gear & Maintenance > Chain Plate Replacement
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Thread: Chain Plate Replacement Reply to Thread
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Topic Review (Newest First)
05-21-2013 11:53 PM
gtod25
Re: Chain Plate Replacement

Quote:
Originally Posted by davidpm View Post
One advantage of titanium over stainless is that apparently polishing of ti is not necessary except for cosmetic purposes.
From my blog; "I ordered Grade 5 (Ti-6Al-4V) Titanium with sand blasted finish. Interestingly someone suggested that the polished finish is too shiny while the blasted finish is cheaper and holds the deck sealant better."


Gerry

ps. Sandblasted Ti is cheaper than polished.
05-21-2013 11:46 PM
davidpm
Re: Chain Plate Replacement

One advantage of titanium over stainless is that apparently polishing of ti is not necessary except for cosmetic purposes.

Do people really polish their SS themselves, and if so how long does it take and what is the process?
If it takes long enough some extra money for the ti may be worth something.
05-21-2013 11:00 PM
gtod25
Re: Chain Plate Replacement

Hi

I must have missed the start of this discussion but I know I contributed to an earlier one. I have installed Ti chain-plates on my Whitby 42 and am well pleased. I have jokingly posted the following on my blog but it has an element of truth;

Titanium Chain-plates are a no-brainer for the following;

1. Rich people.
2. New boat build (especially where the chain-plates are buried - Listen up IPY.)
3. People who have to pay a "professional" $70+ an hour to remove and install the chain-plates.
4. Neurotics like me.

They are not recommended for;

1. Any boat with Baggywrinkles.
2. Any production boat under 30 ft.
3. Cruisers who price their time at 25Cents an hour and spend hours sorting old screws and dubious SS fittings into little boxes (Jim, you know who you are).

http://theincrediblehull.blogspot.co...el/chainplates

05-21-2013 05:47 PM
casey1999
Re: Chain Plate Replacement

Hey thanks for the input. I have decide to purchase silicon bronze bar stock and drill to make up my own chain plates. A lot cheaper that Ti and I will be in charge of the work and schedule. I plan to use US made silicon bronze bolts as well. Plates should be good for a long long time after that.
Regards
05-21-2013 04:57 PM
knothead
Re: Chain Plate Replacement

I just finished drilling the holes in my new chainplates. I went with aluminum bronze. The alloy is called C61400. I purchased it from Atlas Bronze.
After talking to Tom Smith, who is the owner I think, I was convinced that this was the best bronze to use.
It wasn't cheap. But I don't believe I will ever have to change out chainplates again.
I am doing all the fabricating myself, but since they had to cut the material from plate, I had them cut to length. So all I have to do is grind, drill, polish and bend them a little.
I also upsized them. From 1/4" x 1.5" to 3/8" x 1.5. Way bigger than I needed, but I don't want them to be the weak link.
My boat can handle the extra weight.

The address for Atlas Bronze is 445 Bunting Ave. Trenton NJ 08611 and the phone is 800 478 0887.

I have no affiliation with them other than this recent purchase, but I will say that they are very helpful and nice to deal with.

Since I wanted to use the same alloy for the bolts but couldn't find any. I am purchasing round stock from them and am going to make my own bolts by threading both ends. They will all be made the exact length.
The bolts on most of the chainplates are visible inside the boat so I am going to use acorn nuts on the inside so that they all are uniform. The outside will be regular silicon bronze nuts.

http://www.atlasbronze.com/

Edit: The total cost of the material is around $675.00 including the round stock, but not the nuts.
05-21-2013 04:23 PM
talonawd91
Re: Chain Plate Replacement

it is not "Cheap" but I love the idea of never having to check it again. I got what equated to a 60"X13" plate that was 10mm thick for 1200$. I think over time that is way worth it. That made 6 chain plates in my case.
05-21-2013 04:13 PM
talonawd91
Re: Chain Plate Replacement

I'd go with titanium, but I would avoid AlliedTitanium. I went with them and placed an order which took a month for them to tell me was not started. Since I had to remove them to measure, I was stuck unable to sail on their word they would be done in 15days. Bleh!

I ended up finding a local place that will have them to me in two days.

If you want the long drawn out version:
http://www.sailnet.com/forums/showth...alliedtitanium
03-18-2013 02:02 PM
casey1999
Re: Chain Plate Replacement

Quote:
Originally Posted by AllThumbs View Post
Keep it simple. Put in what you took out. Go with stainless.
No way I am going with stainless. The last 316 SS chain plate only lasted 6 years. I will go with silcon bronze or titanium.
03-17-2013 02:39 PM
AllThumbs
Re: Chain Plate Replacement

Keep it simple. Put in what you took out. Go with stainless.
03-13-2013 01:10 PM
Stumble
Re: Chain Plate Replacement

The C76200 is a VERY heat temper dependent metal, with yield strengths ranging from 21,000psi to 110,000psi. This makes is non-suitable for use as a structual metal, unless a huge amount of engineering is done. The upside is that the lower limit is similar to aluminium, so you could borrow a lot from aluminium design. But the price premium would be huge.
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