Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Thread Tools Search this Thread
Old 11-28-00, 02:49 AM   #1
Buddy Hayden
Guitar Hero
Thread Starter
Join Date: Aug 2000
Posts: 403
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Could anybody tell me exactly how are ball bearings made ?,me and a few of my friends have come up with several ways in which they could "possibly" be made ,but no-one knows for sure......thanks Buddy Hayden.
Buddy Hayden is offline   Reply With Quote
Old 12-25-00, 02:40 PM   #2
Senior Member
pat5319's Avatar
Join Date: Sep 2000
Location: Spokane WA
Bikes: Seven Axiom Ti, Trek 620, Masi cylocross (steel). Masi Souleville 8spd, Fat Chance Mtn. (steel), Schwinn Triple Bar cruiser, Mazi Speciale Fix/single, Schwinn Typhoon
Posts: 1,149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
ball bearings

I found this through
(Campagnolo bearings are machined to a 1 micron tolerance!, if memory serves)

Subject: Re: How are ball bearings made?
From: [email protected] (W. Kaiser)
Date: 1996/03/08
Newsgroups: rec.crafts.metalworking

Chris Delikatny ([email protected]) wrote:
> How are ball bearings made?

I knew I had something about this buried in paper, and I found it. It's a six page pamphlet from Atlas Balls division of SKF called "How Balls are Made Round." I've gleaned the following information from the pamphlet.

They make balls from 1/32" to 2-5/8" Dia. A chrome alloy steel is used. Balls up to 1" dia. are cut from wire, and pressed between concave dies in a cold heading machine. Balls from 1" to 1-5/8" are cut hot from bar stock and pressed between concave dies. Balls over 1-5/8" dia are sheared cold from bar, then heated and pressed between dies. This leaves a sort of spherical lump of metal, with excess material around the equator,
called flash. On the larger balls this flash is removed on a double end machine
with file cut discs.

The next step is rill filing, which removes the rough surface of the ball and gets down to clean, solid metal. The machine has two cast iron discs, one rotating and one stationary, with concentric grooves. The balls follow a predetermined path through the machine. They are passed through over and over until they are within .001" of round. The machine can process up to 750 lb. of balls at one time, and processing time ranges from 8 to 20 hours. A picture shows a machine with vertical disks and a horizontal spindle.

The balls are then tumbled in barrels spinning on the end of a rotating arm. The balls are polished in the tumbler until uniform and smooth.

The balls are then heat treated in atmospherically controlled furnaces. The furnace doesn't decarburize the surface, and leaves it clean and smooth. The balls start into the furnace at room temperature, and move to progressively hotter areas. At the proper temperature they are quenched, then tempered. They should be uniformly hard from center to outside.

The balls are then precision ground. The balls roll against hard grinding wheels, following a path determined by guide plates. After 12 hours the balls are true to size and round to within .0001".

After grinding, the balls are lapped between a stationary and revolving cast iron plate. They are constantly bathed with a special lapping compound. Lapping leaves the balls within 27 millionths of an inch to size and roundness. For precision work, they are lapped more, until within 3-5 millionths of an inch. A picture shows a machine with horizontal disks and a vertical spindle.

That's the process, and this is about all I know about it. If there are any other questions, I probably can't answer them, but this should give you some idea of how balls are made. I don't have information on how the rest of the ball bearing is made, but that process is probably more straight forward than making balls.

Bill Kaiser
[email protected]

There are three ways to do a job: good, cheap, and quick.
You can have any two.
A good, cheap job won't be quick.
A good, quick job won't be cheap.
A cheap, quick job won't be good.


[Edited by pat5319 on Dec 28th at 10:52 PM]
pat5319 is offline   Reply With Quote
Old 12-26-00, 11:27 PM   #3
Senior Member
Join Date: May 2000
Location: Dammam,Saudi Arabia
Posts: 62
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ball bearings

Check out this site for a good article on the subject of making ball bearings


Snowplug is offline   Reply With Quote
Old 12-27-00, 03:59 AM   #4
Senior Member
Join Date: Dec 2000
Location: Victoria, BC, Canada
Posts: 55
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

couldn't ne of u guys think of ne thing better to talk about??? for future referance please note the list of topics that myself and many other men can talk about for hours.............

god forbid but just so i don't leave ne one out (DRUGS)

these topics don't have to be talked about alone.......they can be mixed as well!!!!!!! example:trix while on a bike, girls on cars, girls in cars, sex in cars, sex on money, AND SO ON< AND SO FOURTH


nickBMXr is offline   Reply With Quote
Old 12-27-00, 08:20 AM   #5
Senior Member
Join Date: May 2000
Location: Dammam,Saudi Arabia
Posts: 62
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ball bearings

While driving to the ATM, to get some drinking vouchers, which can also come in useful for most of what you mention, I was thinking about your post.


Well ball bearings come in handy with bikes, also with girls, you need them to be able to drink a lot and girls also like them.

Snowplug is offline   Reply With Quote
Old 12-27-00, 10:08 AM   #6
Joe Gardner
BikeForums Founder
Joe Gardner's Avatar
Join Date: Oct 1999
Location: Utah.
Posts: 4,249
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

This is the third post like this you have made today, I have already replied to the other two, please read thoes. I for one thought that this was an interestedin topic that related to bicycle mechanics. If you want to talk about thoes other topics you mentioned above, that is what the open discussion / chit chat forum is for.
Joe Gardner is offline   Reply With Quote

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

All times are GMT -6. The time now is 03:32 AM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.