Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 17-01-2016, 04:16   #16
Registered User

Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 665
Re: Repairing Stainless Steel From Grinding

Don't think it's been brought up but probably the most important thing about doing this efficiently is to use the correct grit in the proper order.
Certainly one could 'polish' out scratches left from grinding welds off with a 36 grit flap disc using 1000 grit paper and jewelers rouge, but it's gonna take you a week and lots of paper and rouge...

In my experience, to do this effectively you roughly double the grit you started grinding with for every step. In other words, if you started with 36, the next step would be 72 (80), then 160 (150), 300 (320), 600 (600) and so on. Any step you skip doubles the amount of time required with the nest higher grade.

The quality of paper doesn't really matter, the better papers just last longer.

I like using a DA (random orbital) sander, the dual action seems to work better and faster than a straight rotary motion. I think it might have something to do with setting up patterns in the material being polished, but who knows? For small jobs a palm sander might work just as well.

And incidentally, once you get above 1000 or so you get a mirror finish without any 'polishing' at all. There is a recent post about it under 'DIY polishing new chainplates?'. By mirror finish, I mean you can clean Sharpie (don't know what they go by in your neck of the woods) marks off with a dry paper towel...

jimbunyard is offline   Reply With Quote
Old 17-01-2016, 04:25   #17
Registered User
captjcook's Avatar

Join Date: Jul 2008
Location: Fort Lauderdale Florida
Boat: Northstar 1500, 35', Siren
Posts: 303
Re: Repairing Stainless Steel From Grinding

On the sandpaper...turn on machine and a quick swipe with bees wax. Any grit, it extends life of sandpaper and improves cutting action. We use it to sand aluminum too! Like welding corners and fairing smooth works like a dream...definitely need to work through grits...not suggesting to start with 1000 grit. Not in agreement with d/a (orbital) for polishing. Moderate speed works best.

captjcook is offline   Reply With Quote
Old 17-01-2016, 04:41   #18
Registered User
Biggusstickus's Avatar

Join Date: Feb 2014
Location: Tas, Australia
Boat: Mustang 3800
Posts: 63
Re: Repairing Stainless Steel From Grinding

Originally Posted by Rustic Charm View Post
Thanks everyone, really appreciate it. I'm off to Bunnings to get some finer grades.

I don't need it to be exceptional because one day I'll have a whole new one made up with a new anchor roller design. But I don't want people looking at it and commenting on how ugly the grinding looks, or rust ruining it either.
Where abouts are you moored, I have some pickling paste here for stainless treatment. I am often at the Royal doing stuff to the boat.

Biggusstickus is offline   Reply With Quote


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
damaging / rusting other yachts with 'steel grinding overspray'? SteelCruiser Construction, Maintenance & Refit 28 11-01-2016 23:41
steel Flange bearing on stainless steel prop shaft PhantomBoatwork Engines and Propulsion Systems 0 10-12-2015 14:19
Steel boat with stainless steel chainplates steve77 Construction, Maintenance & Refit 22 23-11-2015 07:45
Steering Cables - Steel or Stainless Steel ? sailorchic34 Construction, Maintenance & Refit 46 14-01-2014 16:46
Grinding fibreglass Weyalan Construction, Maintenance & Refit 57 10-11-2008 03:51

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:04.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.