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General Engineering
How can I apply extremely low forces to an object?
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[QUOTE="Tom.G, post: 5503382, member: 581973"] Oh! You want to know the actual force?:wideeyed: You could always calibrate with known weights. It's probably easier than you think. For instance knitting yarn is sold in a variety of weights with both the weight and length given. A common medium gauge ball of wool would be 100grams/200meters; two meters per gram; 1mG would be 2mm. The yarn comes as a single strand, two, three, four, or six strand, with three strand more common around here, so for greater resolution you can use one strand of a multi-strand yarn. There is also cotton cord and sewing thread available in large spools. I don't know if they are marked with both weight and length so they may take a little more work to get weight per unit length. Use either cotton or wool fibers for this, the static charge from synthetics will drive you crazy. Other tips. You need a draft free, rather clean, work area once the meter movement is opened. Both the internal clearances and available torque are tiny. You may want some optical magnification when working on the meter. I use a pair of cheap reading glasse from the local drug store. I just put them on over my everyday tri-focals! Two pair of fine tweezers are also handy, [B]non-magnetic only[/B]. [/QUOTE]
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How can I apply extremely low forces to an object?
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