Home Model Engine Machinist > The Tools and Tips > The Specialist > Babbitt bearings
Reply
 
Thread Tools Display Modes
Old 07-12-2011, 04:07 PM   #1
machineman8625
 
Join Date: Jul 2011
Posts: 6
Liked 2 Times on 2 Posts

Default Babbitt bearings

I poured babbitt bearings and machined them for 25 years. What little I know about babbitt bearings I would be glad to share. I actually do not know why no one seems to use babbitt for model engineering. Larry



__________________
machineman8625 is offline  
 
Reply With Quote Quick reply to this message
Old 07-12-2011, 04:18 PM   #2
mgbrv8
 
Join Date: Jul 2011
Location: Mcallen TX
Posts: 154
Liked 14 Times on 13 Posts

Default Re: Babbitt bearings

Larry
When you have a ovaled or worn out bore. What is the best way to pour babbitt in that void. I understand I need to blacken the part that I dont want babbit to stick to with a carburizing flame but what do I need to do to prep the other surfice to help the babbit stick to it. Also what is to small of a void to pour into??

Dave



__________________
mgbrv8 is offline  
 
Reply With Quote Quick reply to this message
Old 07-12-2011, 05:30 PM   #3
GWRdriver
Senior Member
 
Join Date: Jan 2009
Posts: 715
Liked 106 Times on 87 Posts
Likes Given: 27

Default Re: Babbitt bearings

Seems to me the best way to do it would be to prep the entire bore and pour in a sleeve of babbit and then rebore to the req'd diam.

__________________

Cheers,
Harry

GWRdriver is offline  
 
Reply With Quote Quick reply to this message
Old 07-12-2011, 07:02 PM   #4
machineman8625
 
Join Date: Jul 2011
Posts: 6
Liked 2 Times on 2 Posts

Default Re: Babbitt bearings

To repair the oval shaped bore, I guess bore it round 1/16 to 1/8 oversize. You can make the babbitt not stick by painting the area with a horsehair acid brush with stove polish that you can buy at any woodstove store. It is just carbon black powder in a alcohol, or some other quick drying liquid. You can actually paint it a second time. To make the babbitt adhere to steel ,brass , or copper, get some soldering fluid in a small 6 to 8 ounce container at any Ace hardware store. If they don't have it they can get it in a day or two special order. Heat the part with a propane torch until the soldering fluid bubbles when you apply it with a acid brush. Then just tin it(apply solder) with lead solder. Just get a whisper coat and then babbitt will stick to that when you pour it. Larry

__________________
machineman8625 is offline  
 
Reply With Quote Quick reply to this message
Old 07-12-2011, 11:47 PM   #5
JorgensenSteam
Guest
 
Posts: n/a
Default Re: Babbitt bearings

Larry-

There seems to be several schools of thought about babbit bearings.
My Dad used them for 50 years at his lumber facility for all of the fans in the kilns, and according to him, they were the only bearings that would run for very long periods of time for many years. He did mention that they have to be kept oiled.

Another school of thought comes from one of the old steam engine design books from the late 1800's, where one designer noted that while the babbit bearing itself never wears out, the journal or shaft will wear out, and replacing a journal or crankshaft was a much more difficult problem than replacing a bearing.

Charles Porter of the Porter-Allen steam engine fame (Porter designed the first "high-speed" steam engine in 1876 which revolutionized steam engine design for the next 50 years) preferred to run gray cast iron on gray cast iron, and found that to give the very best wear characteristics of all, and far better than brass.

__________________
 
 
Reply With Quote Quick reply to this message
Old 08-12-2013, 12:19 PM   #6
hpchoudhury
 
Join Date: Aug 2013
Posts: 1
Default

Larry-Can you please share total flow chart of Babbiting Process including inspection process

__________________
hpchoudhury is offline  
 
Reply With Quote Quick reply to this message
Old 08-12-2013, 01:20 PM   #7
Jasonb
Project of the Month Winner!!!
 
Jasonb's Avatar
 
Join Date: Mar 2008
Location: Surrey, UK
Posts: 1,900
Liked 318 Times on 189 Posts
Likes Given: 11

Default

Dave's build thread of his Pacific Vapour Engine shows babbitt used on a model.

http://www.homemodelenginemachinist....tml#post187387

J



__________________

Last edited by Jasonb; 08-12-2013 at 01:24 PM.
Jasonb is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
a use for your old bearings mklotz The Break Room 7 04-20-2011 12:13 AM
babbitt bearing jonesie Questions and Answers 5 03-29-2011 05:05 PM
Carlisle + Finch restoration- Babbitt myrickman Engines From Castings 2 01-01-2011 02:25 AM
Something Like Babbitt PolskiFran Metals 6 04-09-2008 03:58 AM
TB1 - Bearings joe d Team Builds 0 04-04-2008 03:24 AM

Newest Threads




- Top - Member List