View Full Version : Turning a ball in 1903

Alan Douglas
01-01-2014, 05:40 PM
While browsing through a volume of Machinery I came across this in the October 1903 issue. I haven't tried it but thought someone might like to:

01-01-2014, 06:30 PM
Interesting. Reminds me of the method used to turn that precision wonder of wonders, the silicon carbide kilogram standard, supposedly the roundest object ever made.

01-01-2014, 08:44 PM
I would like to see it in action.


Bob Fisher
01-01-2014, 09:01 PM
Me too! Bob.

01-01-2014, 09:40 PM
Similar method works quite well for wood (and stones).

01-01-2014, 10:23 PM
In one of Alexander Weygers's books, he shows this method of ball turning.

J. R. Williams
01-01-2014, 10:53 PM
A similar method is used with an abrasive slurry to lap large industrial ball valve balls and also smaller glass balls for valves and joints.

01-01-2014, 11:57 PM
How do you know when to stop cutting?

01-02-2014, 02:10 AM
How do you know when to stop cutting?

Your balls drop off :)

01-02-2014, 03:37 AM
How do you know when to stop cutting?

I'm guessing you stop when it measures out to the correct diameter.

Is this basicly like centerless grinding, but for spheres?