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I would like to know why one would choose to use a step motor over another technology i.e. DC servomotor, Brushless DC servomotor, etc. My understanding of the advantage of a step motor (dated by about 25 years) was the ease of controlling motion/position without shaft position feedback. When...

You can put the data on another sheet (see the second example I sent). You have to type the area because the data validation will not let you choose another sheet.

unclesyd, Thanks, this looks promising. Size and angle of rotation is a question, and I've contacted C-Flex for more information.

sreid, Thanks for the reply. Yes, I did mean a pair of angular contact ball bearings. I was afraid that the oscillation would be a problem for lubrication. I will investigate the Krytox grease. I did consider jeweled bearings. I made an assumption that the radial play would be unacceptable...

How about a bearing system that will be expected to last a minimum of 25 years under the following conditions: •Preloaded ball bearings •Bearing ID will be 2mm with typical OD for this size (~6mm) •Radial load on bearing = 0 to 5 grams (depending on orientation during operation) •Axial load...