> I am not sure what yo mean by preload/stretch though. > > > After installing the ballscrew you then put an indicator on the end of the ball screw with the mag base on the machine base. You then tighten the bearing preload until you see .007 to .009 stretch of the end of the ballscrew. I don't know which is really moving - the screw stretching for the machine base compressing. I am sure both is happening but to what extent I don't know.
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