Reply
 
Thread Tools Search this Thread
 
Old 02 April 2007, 19:03   #1
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
Polishing Stainless

I recently cut of a pair of brackets that were welded to my Aframe and it has left some unsightly grinding marks where I used a grinder to do the work. Is is possible to get rid of these marks and what is the best method?

Thanks

Chris
__________________

__________________
Chris is offline   Reply With Quote
Old 02 April 2007, 19:16   #2
RIBnet supporter
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
Quote:
Originally Posted by Chris1573 View Post
I recently cut of a pair of brackets that were welded to my Aframe and it has left some unsightly grinding marks where I used a grinder to do the work. Is is possible to get rid of these marks and what is the best method?

Thanks

Chris

Fine emery paper followed by a buffing wheel with polishing soap.
__________________

Jizm is offline   Reply With Quote
Old 02 April 2007, 19:23   #3
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
There's a really good stainless polisher in Stonehouse. I'll try and find his name.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 03 April 2007, 07:48   #4
RIBnet supporter
 
Country: UK - England
Town: Over there ---->
Length: 3m +
Join Date: Jan 2007
Posts: 240
You can do it yourself, but its a very long, very messy job. I'd pay someone to do it for you.
__________________
I don't have an attitude, I have a personality you can't handle.
Sixy_the_red is offline   Reply With Quote
Old 03 April 2007, 12:23   #5
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,021
A mini angle grinder with sanding discs or similar to start. If you've used a grinding disc then you will prob have to start with around 40 or 60 grit, a flap disc would also work. Then go up through the stages, 120,240 etc to about 300-400 grit. Then you need a coarse polishing soap like Supercut 40 on a sponge or similar compounding mop. Then you can use something like autosol just to bring up the shine and finish it off.

It needs to be spot on mirror finish if you don't want it rusting.

At work we get all our polishing supplies from here.
Their site is worth a good look, they have some handy guides etc to help you with polishing metals.
Edit - website is having an upgrade, polishing guides not there anymore
METHOD No. 2 - pay someone else!
__________________
martini is offline   Reply With Quote
Old 03 April 2007, 12:51   #6
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I thought that Stainless Steel fabricators get their work chemical dipped for a highly polished finish?
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 03 April 2007, 18:23   #7
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,021
Quote:
Originally Posted by Hightower View Post
I thought that Stainless Steel fabricators get their work chemical dipped for a highly polished finish?
Larger companies may dip their work in 'passivating' chemicals which remove oxide scaling, burn marks and annealing discolouring (yellow/purple bits next to weld). It also restores the chromium oxide layer covering the stainless which is the stuff that makes it corrosion resistant.

It gives a clean look but doesn't actually polish nor unfortunately does it get rid of dodgy grinding marks!

I have seen a process where the job (usually smallish items) are put in a tank full of tiny plastic abrasive balls and the tank is agitated for a couple of hours. It comes out with a perfect mirror finish but it's the kind of thing thats more the reserve of the mass production industries, can't see my boss forking out that kind of just to make my life easier!
__________________
martini is offline   Reply With Quote
Old 03 April 2007, 19:08   #8
RIBnet supporter
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
Quote:
Originally Posted by Hightower View Post
I thought that Stainless Steel fabricators get their work chemical dipped for a highly polished finish?

I have seen some fabricators brush 'pickling paste' onto their weld, brings it proper, gets rid of the discolouration.
Jizm is offline   Reply With Quote
Old 03 April 2007, 19:42   #9
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Quote:
Originally Posted by Jizm View Post
I have seen some fabricators brush 'pickling paste' onto their weld, brings it proper, gets rid of the discolouration.

I've got some here, some kind gent on RIBnet sent some to me.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 April 2007, 03:40   #10
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Quote:
Originally Posted by Jizm View Post
I have seen some fabricators brush 'pickling paste' onto their weld, brings it proper, gets rid of the discolouration.

....but it doesn't "polish" the surface.
__________________

__________________
Jono 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 20:52.


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