micro motion

I all of a sudden got into beam bots as a project to do when I'm bored, anyways what's the smallest device to get motion? THe device also can't be power hungry. would muscle wire work? how many amps do they take? does anybody know how to wind their own micro solenoids?

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guyfrom7up (author) 10 years ago
ok, I've been searching, and does anybody know where to get the .001 inch diameter flexinol? I don't want to buy from dynalloy because I either get a 10 dollars handeling fee, or I spend at least 50 bucks, which I don't want to do, inless someone want's to go in for a group buy.
Patrik guyfrom7up10 years ago
.001 inch is 25 micrometer (aka microns) - typically listed as "flexinol 025". Just google "muscle wire" or Flexinol. Here are a few hits:

http://www.robotstore.com/store/product.asp?pid=289&catid=1635

http://www.elexp.com/kit_2mt3.htm

http://www.smallparts.com/products/descriptions/naw.cfm
guyfrom7up (author)  Patrik10 years ago
thanks for the links, do you know what the difference is between the low temp and the high temp flexinol for an electric application? According to the flexinol datasheet they're hte same, just that the high temp relaxes faster.
Patrik guyfrom7up10 years ago
The higher the temperature of the wire, the faster it will cool off when you remove the current, because the temperature difference between the wire and surrounding air will be larger. That means that a wire with a higher transition temperature will tend to go through the transition zone faster when cooling off, i.e. the wire will relax faster, and will be able to switch back and forth faster. The new HT wire is a little more expensive and can run very hot (Activation Finish Temp is 98 Celsius - almost boiling). Looks like the 25 micron wire is only available in a LT version - possibly because the very fine wire is too easy to overheat and burn through.
guyfrom7up (author)  Patrik10 years ago
Patrik guyfrom7up10 years ago
Dunno - a figment of your imagination perhaps? :-D I just based that assumption on the specs available from robotstore.com. I guess their information is outdated...
guyfrom7up (author) 10 years ago
Is there a datasheet for flexinol? I'm not sure what gauge to get, the smallest gauge is .0015 inches, or 38.1 microns, or thinner than 40 gauge. According to my calculations it'd take about 30 mA but I couldn't figure out resistanace. I don't know how many grams it could hold before snapping, because 38.1 microns is PRETTY thin.
guyfrom7up (author)  guyfrom7up10 years ago
never mind, I found it, it was hidden in the dynalloy page
guyfrom7up (author) 10 years ago
thanks guys, I think I'm going to go with the flexinol wire because it can be cut up to make a bunch of tiny motion devices (smaller than motors) and take up about the same amount of current.
Don't forget that their motion is only about 4% of their length - a 5mm length will only shrink by 0.2mm.
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