Reply
 
Thread Tools Search this Thread
 
Old 30 October 2011, 07:15   #1
Member
 
Country: UK - N Ireland
Town: Portaferry
Make: Avon
Length: 4m +
Engine: 30hp
Join Date: Sep 2011
Posts: 104
Powder coat vs Stainless

Folks I have been looking around for a good A frame at reasonable money for a SR4 and drawn a blank. Part of the problem being carriage to NI is as bad as the unit price itself.

While I have access to benders for SS tube the welding will prove more of a problem (and cost). So has anyone any experience or comments on fabricating a steel tube A frame and then powder coating? Steel tube is a lot easier to bend in a neat curve, easy to notch and a lot easier to weld with a MIG to give a neat clean strong finish. By powder coating it provides a secure finish but how does it stand up to use in sea water and what do you think about appearance? Colour coding to boat? What other ways are about to finish steel tubing for use at sea? Any drawings or plans about showing sizes etc. Any designs?
__________________

__________________
MI3GTO is offline   Reply With Quote
Old 30 October 2011, 07:20   #2
Member
 
biffer's Avatar
 
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
Engine: inboard/diesel
Join Date: Aug 2007
Posts: 3,848
Powered coating always comes off eventually. Stainless is the best option

sent from a remote device
__________________

__________________
biffer is offline   Reply With Quote
Old 30 October 2011, 07:27   #3
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
The seas are littered with bits of flaked off powder coating.

Wot Biff said!
__________________
Courageous is offline   Reply With Quote
Old 30 October 2011, 07:42   #4
Member
 
ashbypower's Avatar
 
Country: UK - England
Town: Salisbury/Poole
Boat name: Blue C
Make: XS 600
Length: 6m +
Engine: 125hp Opti
MMSI: 235082826/235909566
Join Date: Jan 2004
Posts: 1,439
Quote:
Originally Posted by biffer View Post
Powered coating always comes off eventually. Stainless is the best option

sent from a remote device
+ 1

We have in the workshop a 5 year old Diving compressor which is powder coated and had very little use, more Flakes than a '99 ice cream and has never been near the sea!!!.... stainless every time on a boat for me..
__________________
Brian C
Harbour Sea School & APS Marine Centre
ashbypower is offline   Reply With Quote
Old 30 October 2011, 10:34   #5
Member
 
Ruari 29's Avatar
 
Country: UK - Scotland
Town: Stonehaven
Make: Avon Sea Rider 5.4
Length: 5m +
Engine: 50Hp Mercury 4' EFI
Join Date: Jul 2011
Posts: 290
I had an ex-Raf "towel warmer" as an a-frame it was galvanised, horrible to touch and corroding. I prepared & painted with black hamerite until I could afford a stainless one.
Stainless all the way! Will last longer

Sent from my Samsung Galaxy S using Rib.net
Attached Thumbnails
Click image for larger version

Name:	2011-09-09 13.57.05.jpg
Views:	140
Size:	100.3 KB
ID:	63591   Click image for larger version

Name:	2011-09-09 13.57.19.jpg
Views:	119
Size:	99.0 KB
ID:	63592  
__________________
www.CastleCharter.co.uk
Ruari 29 is offline   Reply With Quote
Old 30 October 2011, 11:08   #6
Member
 
Country: Netherlands
Town: groningen
Boat name: tess, searanger
Make: sailer, avon 5,4
Length: 8m +
Engine: inboard, suzuki 90
Join Date: Jul 2010
Posts: 95
frame

Stainless of aluminium is ok and you can get stainles pre bend corners direct you only need to weld them.
they come in 45' 90' etc etc. and there will be a workshop in NI to weld those? isnt there?

you can come over to holland and i can arrange it for you.

lots of succes

reg
bert
__________________
diverbert is offline   Reply With Quote
Old 30 October 2011, 12:16   #7
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
I have a hard time believing that welders there have that much trouble welding stainless. The bending problem I can see, but here in the SF Bay Area, stainless welding goes roughly the same rate as welding mild steel.

Aluminum will work for an A-frame, but you want thick walled material, and etching and powder-coating will prevent the rough powdery coating that inevitably forms on aluminum (which won't hurt all that much but isn't pleasant to look at or touch.) You also want to design it so vibrational movement is mitigated; aluminum will tend to stress-crack if it's allowed to repeatedly flex.

I'd go stainless if at all possible.

jky
__________________
jyasaki is offline   Reply With Quote
Old 30 October 2011, 12:36   #8
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Our's is in non-marine 2" Ally with quality orange powder coating. Looks dead smart. Keep it simple, the lugs were an unwanted add-on c/o the fabricator.

We kept it low and braced as it's a wakeboard tug.
Attached Thumbnails
Click image for larger version

Name:	SR4 Frame 001.JPG
Views:	380
Size:	123.3 KB
ID:	63615  
__________________
Mollers is offline   Reply With Quote
Old 31 October 2011, 06:11   #9
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,611
Powder coating is fine until the water gets in behind it, which is inevitable.

I have an ally frame. Self anodising! Having said that it's not anything like as shiny as a stainless one, but until I get the toobs sorted it doesn't look too out of place!
__________________
9D280 is offline   Reply With Quote
Old 31 October 2011, 16:33   #10
Member
 
Country: UK - N Ireland
Town: Portaferry
Make: Avon
Length: 4m +
Engine: 30hp
Join Date: Sep 2011
Posts: 104
Today got price for 316 polished stainless tube @ 31mm and 50mm x 6mt long 31mm was 8 a meter and 50mm was 12 per meter so looks like SS is way to go. Welding I have asked at a local engineering shop and they will TIG it for me if I cut all the parts and do the bending etc. so looks like a go thanks for all the info
__________________

__________________
MI3GTO is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:15.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.