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Re: metric bearings?
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Posted by John-Paul T on July 15, 2007 at 13:41:04 from (216.169.177.76):
In Reply to: metric bearings? posted by Chris Heinzle on July 15, 2007 at 11:06:49:
When it comes to steel ball bearings Im not surprised at all! We were trading both parts and assembly work back in the 20's. But they may be the very very good german made ball bearings NOT the china crap steel ones. Huge diff in those two! In fact Id take the german ones over ours even today and that says ALOT. The bolts in metric didnt appear commen till later reason is most didnt have the tools needed to work on them in US. In fact most #1 grumble back in the 70's with foreign cars WAS the metric tools (just they didnt have them). So when it came to machining, bearings and similar YES, metric was here back then. Infact most machining is metric as its far far more accurate. When I had machine shop I rarely ever saw inches scale (ya even thousandths). Metric is easier to read and remember at the tiny tiny sizes. Just so you dont think Im lowing smoke out my....(hehe) http://www.sizes.com/built/ball_bearings.htm
"Because the best ball bearings in the early 20th century were made by German manufacturers, ball bearings have usually been sized in millimeters, even those made in the United States�but the balls themselves were frequently sized in inches."
http://www.answers.com/topic/ball-bearing?cat=technology
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