King pins

[mat]

Has anyone ever seen them snap/break? what are they made out of and how do you go about making them? just interested, I don't want to actully make them.

[zapster]

King pins are made from heat treated 4130..
They are then hardend and ground to size..

You'll never cut one with a hacksaw..
Abrasive wheel will cut them..

...zap!

[mat]

Originally Posted by zapster

King pins are made from heat treated 4130..
They are then hardend and ground to size..

You'll never cut one with a hacksaw..
Abrasive wheel will cut them..

...zap!

4130 cromoly ay?, what has me beat is why would they harden then and then try and ground them to size?. would be a bitch of a job.

[David R]

"A grinder knows no hardness" My welding teacher told me that in 1979. I believe him. The probably harden them after they are made to size like things made out of drill rod.

I was in an accident in a 1964 VW bug. Broke the right kingpin into 3 pieces. Basicly the piece in the spindle stayed there. I had a lapbelt on before it was a law. I put my face through the windshield and had no other injuries.

David

[zapster]

Originally Posted by mat

4130 cromoly ay?, what has me beat is why would they harden then and then try and ground them to size?. would be a bitch of a job.

A "Centerless Grinder" will spit these out like there's no tomorrow..
Cut the shaft..
Heat treat..
Grind..
But the "half round" cuts that the roll pins go thru are machined into the pin before hardening..

...zap!