Roll Cutting/Roll Forming

I ran across that video the other day.

Fascinating that they can roll the threads with such precision. I suspect those are ball screw lead screws for a CNC mill or lathe.
 
....I suspect those are ball screw lead screws for a CNC mill or lathe.

If they are, then the next step will be heat treating then the final form is ground. There are some cheapie CNCs that use as rolled ball screws, but good ones always use ground screws.
 
I worked at Giddings & Lewis Machine Tool in Fond Du Lac a couple years about 20 years ago. One of the
things I bought was round alloy steel bar for ball screws. They ground them to finish size.
MY coworker and I bought Lots of old service & repair parts, for prints dated 1920's to 1960's.
About every couple months get a 19-teens print, had an 1890's part once.

It was Amazing the tight tolerances they could machine, and measure accurately. Only once did the
machine shop come to me to buy a part that they couldn't machine, part had a crazy 4 decimal
perpendicularity dimension on a ID shoulder to the centerline of the extra fine threads. Was a bearing
lock ring.

Some of their routings needed some updating. I had to bring a couple new good suppliers on board. They
had a totally different class of suppliers than I was used to dealing with.
 

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