Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-06-2009, 21:13   #1
Registered User
 
SabreKai's Avatar

Join Date: Sep 2008
Location: Toronto, Canada on Lake Ontario
Boat: Roberts Offshore 38
Posts: 1,287
Images: 5
Needle Scalers

Has anyone any comments about using this device for removing rust n scale from keels and steel structures? I am going to have to clean out the engine compartment on Espina, and thought this might be a bit less messy than grinding or sand blasting. I gather they are very noisy but earmuffs should take care of that.

Comments?

--


Sabre
__________________

__________________
SabreKai
SV Sabre Dance, Roberts Offshore 38
http://sabredancing.wordpress.com/
SabreKai is offline   Reply With Quote
Old 08-06-2009, 00:48   #2
Registered User
 
Splash Gordon's Avatar

Join Date: Oct 2007
Location: Cape Town
Posts: 69
Needle-Scalers are EVILLY efficient things for removing rust!
They're probably not quite as good as a sand-gun, but in terms of messiness and ease of use, they're undoubtedly the next best thing to having someone else do the work for you with a chipping-hammer! IMHO, I'd probably do the job in the water- reason being that the water'll deaden the roar of the needles!
__________________

__________________
Splash Gordon is offline   Reply With Quote
Old 08-06-2009, 00:59   #3
Wayfaring Mariner
 
captain58sailin's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Homer, AK is my home port
Boat: Skookum 53'
Posts: 4,045
Images: 5
I don't know if you are using an electric one or an air model. I have only experience with the air powered ones and they require a good deal of compressed air to work properly, they are also expensive. If you do go that route be sure to put a little oil down the air receptacle going into the gun periodically, since they use so much air there is a good bit of moisture that goes through them. Also get a bunch of spare needles and plunger. What ever air pressure the manufacturer recommends, is the air pressure to use, more is not better with regards to this application. If you are going to be using this long term, you might be better served with a small hopper sand blaster, cover more area in less time with less damage to the steel.
__________________
captain58sailin is offline   Reply With Quote
Old 08-06-2009, 05:22   #4
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,579
Images: 240
Safety Goggles (or better yet a full face shield), Dust Mask, and Hearing Protection must be worn by everyone in the work area. Operator should wear heavy Gloves.

If the scaler has an adjustable front nose collar, adjust it back for looser needles on rough surfaces, and forward for tighter needles on fine surfaces.
Use as little pressure as possible, allowing the unit to work at its own pace.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 08-06-2009, 16:47   #5
Registered User
 
SabreKai's Avatar

Join Date: Sep 2008
Location: Toronto, Canada on Lake Ontario
Boat: Roberts Offshore 38
Posts: 1,287
Images: 5
Based on the comments, I think I'll give it a try. I have a fair number of small patches on the hull of SabreDance that could be done with this thing as well.

Tks
--

Sabre
__________________
SabreKai
SV Sabre Dance, Roberts Offshore 38
http://sabredancing.wordpress.com/
SabreKai is offline   Reply With Quote
Old 08-06-2009, 20:12   #6
Registered User
 
lorenzo b's Avatar

Join Date: May 2009
Location: Panama
Boat: Steel trawler 63' Eileen Farrell
Posts: 961
Needle guns and air chisels work really well. Wear a breathing mask, eye and ear protection and it helps to have your vacuum cleaner handy to suck up the chips so you can see the surface your working on. Serious ear protection.
__________________
lorenzo b is offline   Reply With Quote
Old 08-06-2009, 20:31   #7
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,826
Quote:
Originally Posted by lorenzo b View Post
Needle guns and air chisels work really well. Wear a breathing mask, eye and ear protection and it helps to have your vacuum cleaner handy to suck up the chips so you can see the surface your working on. Serious ear protection.

The US Navy gave me none of that when I did grunt work for them as an E=3 back in the '60's. My hearing's pretty shot as a result.

Steve B.
__________________
senormechanico is offline   Reply With Quote
Old 08-06-2009, 23:23   #8
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
Tannic Acid is evil...

On Boracay I do small rust repairs by cleaning as much "scale" off as possible by hand and then treating with either phosphoric or tanic acid.

The phosphoric sort of works.

If the phosphoric doesn't give me satisfaction I switch to tanic. It spreads it's evil purple stain everywhere, but given a few days and lots of "encouragement" it seems to get the rust to a manageable level.

It might not be better than a needle gun, but your hearing will stay with you a little longer. The purple fingers get better with time.

I'm currently trying a vinyl primer, but I'm not sure I'd recommend it to my worst enemy.
__________________

__________________
Rust never sleeps
Boracay Blog.
Boracay 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
sd60 wind needle not obeying craig boorman Marine Electronics 6 24-02-2009 16:46
Yanmar Saildrive Needle Bearings Captain Bill Propellers & Drive Systems 0 19-02-2009 12:54



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:21.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.