02GF74
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 posted on 4/2/08 at 11:35 AM |
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How are bal bearings made?
how?
(without going into a discussion that you cannot make a completely spherical ball bearing on earth due to gravity) 
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Mr Whippy
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| posted on 4/2/08 at 11:38 AM |
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If I remember correctly they are ground together in a big drum full of water and grit or was that how they made marbes??
behold -
http://science.howstuffworks.com/question513.htm
[Edited on 4/2/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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02GF74
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| posted on 4/2/08 at 11:48 AM |
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So they are not made by Chinese orphans using tiny chisels?
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Peteff
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| posted on 4/2/08 at 11:56 AM |
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Fascinating stuff, when I worked in the foundry we used to make nickel shot for the plating industry and it was made by melting the nickel and pouring
it into a pool of water. Obviously the size of the shot was very random but they were always very round. We also made anodes which had to be polished
in a drum which was filled with gravel and left to turn slowly overnight and eventually all the pebbles turned into perfect spheres before they ground
to dust.
[Edited on 4/2/08 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Mr Whippy
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| posted on 4/2/08 at 11:59 AM |
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quote:
Originally posted by 02GF74
So they are not made by Chinese orphans using tiny chisels?
 only the cheap ones
Fame is when your old car is plastered all over the internet
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dhutch
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| posted on 4/2/08 at 12:09 PM |
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quote:
Originally posted by 02GF74
So they are not made by Chinese orphans using tiny chisels?
No, thats how the assemble the balls into the races.
Daniel
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Mr Whippy
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| posted on 4/2/08 at 12:20 PM |
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I was watching a documentary last night about new bridges being built in china, around 50  in all.
They where going on about how the workers were keen to climb way up high fitting suspension bridge cables due to the high wages;
$200 a month! if that's high what's low????
[Edited on 4/2/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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coozer
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| posted on 4/2/08 at 12:23 PM |
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Our sister plant make the balls for NSK RHP & ISKRA bearings here in sunny Gods allotment.
Molten metal is drop down a tower through a sieve with holes graded for the size of ball required into cold water, resulting in a perfect sphere.
OR... believe it or not the most common method is on a lathe. Turned with curved tip.
Simple enough to knock millions of them out every day.
And to size the finished article they measure the noise of the bearings with a stethoscope. The less noise the higher the grade of bearing. I kid you
not.
Steve
1972 V8 Jago
1980 Z750
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David Jenkins
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| posted on 4/2/08 at 12:38 PM |
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Here's a clue...
LINKY
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Richard Quinn
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| posted on 4/2/08 at 12:44 PM |
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I remember looking this up a few years back when we tendered for a job at a "former ball bearing factory". At the time we had many
suggestions including filing from a block! Now that's craftsmanship!
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NS Dev
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| posted on 8/2/08 at 03:40 PM |
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Devid Jenkins' link is right.
They are sheared and stamped from wire/bar by a rotary head stamp/shear and then put through rill plates.
Taper roller bearing rollers are also stamped from wire. basically a cleverly arranged drive allows a head to rotate at high speed but not in a
continuous motion but a series of "jerks".
At each "jerk" the wire is advanced, then sheared off by a rotating shear, then punched into a tungsten carbide die (again on the rotating
bit of the machine) then punched out by an ejector pin. The whole lot happens so fast that the head just appears to be rotating and ejecting a
continous stream of rollers. The die is replaced regularly and the stamp and ejector pins are too.
After forming the rollers are generally moved around in plastic tubes, that are used to feed them continously into the grinding and polishing machines
and the assembly machines.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 8/2/08 at 03:42 PM |
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PS I used to work for Timken!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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andyps
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| posted on 11/2/08 at 01:52 PM |
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quote:
Originally posted by NS Dev
PS I used to work for Timken!
So did I. Do you still have the ringing in your ears from visiting the roller shop?
Andy
An expert is someone who knows more and more about less and less
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NS Dev
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| posted on 11/2/08 at 11:44 PM |
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lol were you at Duston then??
I actually worked for Ti Desford, owned by Timken in its last 8 years and we supplied Duston and Colmar etc with the steel for the races
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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andyps
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| posted on 12/2/08 at 11:45 PM |
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I didn't work at Duston, I was in the Pontefract office, but used to go to Duston and Daventry regularly and often had to take customers around
the plant. They were always fascinated by the roller shop, but you couldn't have a conversation in there.
I presume it is all houses now, haven't been near for a few years.
Andy
An expert is someone who knows more and more about less and less
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NS Dev
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| posted on 13/2/08 at 12:31 AM |
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yep, all houses now.
no idea what they are doing with the old tubes site where i worked.
Too contaminated (sulphuric acid and oil) to build on it, think its being used as storage or something
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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