tag:blogger.com,1999:blog-8638314129554222223.post7045465463942424973..comments2024-03-01T06:47:26.665-08:00Comments on WriterOfMinds: Nylon Fishing Line Artificial Muscles VIWriterOfMindshttp://www.blogger.com/profile/03848533877998707168noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-8638314129554222223.post-39862231998869089962016-01-20T20:53:35.777-08:002016-01-20T20:53:35.777-08:00I don't have a good way of measuring the tempe...I don't have a good way of measuring the temperature directly. With the voltage X current (= power) put into one of my muscles and the ambient air temperature, you might be able to attempt a heat transfer calculation and derive the temperature of the wire. Unfortunately I don't know the ambient temperature for the data sets on this page. For one of my more recent muscles, I can give you the following parameters:<br /><br />V = 5.7 V<br />I = 1 A<br />T = 57 F (still air)<br /><br />This isn't necessarily representative. The amount of power (thus, temperature increase) you need to get a response depends on the style of muscle (e.g. secondary coil diameter) and the load it's under.WriterOfMindshttps://www.blogger.com/profile/03848533877998707168noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-37899919416909629602016-01-19T16:21:56.113-08:002016-01-19T16:21:56.113-08:00Did you measure the temperature required to get th...Did you measure the temperature required to get them to contract? I am working on a design that uses a peltier plate to heat and cool an insulated bundle of these and am trying to figure out if a peltier will even work. I am thinking a little bit of low viscosity oil might even help to lubricate and spread heat inside the flexible insulated enclosure. Anonymoushttps://www.blogger.com/profile/06454164091229676961noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-78526340451475163052015-08-06T17:58:51.656-07:002015-08-06T17:58:51.656-07:00Sorry I didn't respond sooner ... this one fel...Sorry I didn't respond sooner ... this one fell through the cracks. I think the best timing data I can give you is for one of the muscles that I videoed, which lifted a weight of about 35 g over a distance of 2.5 cm. It took roughly 24 s to contract and at least a minute to relax. This was in ambient air (no attempt at forced cooling).WriterOfMindshttps://www.blogger.com/profile/03848533877998707168noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-85169802909499194892015-08-06T17:47:41.084-07:002015-08-06T17:47:41.084-07:00Thanks for the feedback! On your question, I'...Thanks for the feedback! On your question, I'll have to remember that as something to check out in future investigations. I think it would depend on the diameter of nylon used, because the thinner nylon filaments self-coil more tightly.WriterOfMindshttps://www.blogger.com/profile/03848533877998707168noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-17357217357735275772015-08-02T16:38:24.518-07:002015-08-02T16:38:24.518-07:00A couple comments and a question:
C1: I would sa...A couple comments and a question:<br /><br />C1: I would say, to rod vs. self coiled, it depends on your application. Rod wound produce higher contraction lengths, which can be used with greater mechanical advantage for a given application. The less room you have to gain mechanical advantage, reducing your coiling diameter up to self-coiled allows for greater base power. <br /><br />C2: Excellent posts, very insightful. Enjoyed greatly.<br /><br />Q: I've yet to find this: Roughly, for self coiled muscles, how much length is consumed by the coiling process?Anonymoushttps://www.blogger.com/profile/04833471194336354416noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-65423543638545531052015-07-09T18:42:52.301-07:002015-07-09T18:42:52.301-07:00What's the fastest response/relax times you...What's the fastest response/relax times you've been able to achieve?Daltonhttp://no_url.orgnoreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-31731810856191544992015-03-06T23:30:52.862-08:002015-03-06T23:30:52.862-08:00hey, have you tried using pre-coiled nylon hoses? ...hey, have you tried using pre-coiled nylon hoses? If so, what were the results?Anonymoushttps://www.blogger.com/profile/03468325021303585380noreply@blogger.comtag:blogger.com,1999:blog-8638314129554222223.post-56726064999916235952014-08-29T23:18:34.706-07:002014-08-29T23:18:34.706-07:00If you multiply Loadweight by %Contraction
we get ...If you multiply Loadweight by %Contraction<br />we get a figure of merit that represents work.<br />You can see a trend toward the smaller 2nd<br />diameter able to do the most work.<br /><br />I would go with the thinnest mandrel your drill<br />can chuck that won't fold over unexpectedly<br />from sideforce of guiding the line onto it.<br /><br />I have an unverified feeling that going flat is<br />not an issue for rod diameters less than or<br />equal to the line diameter.<br /><br />I've seen it happen with EagleClaw80# coiled<br />on 16Gauge, but this was while deliberately<br />over-stretching cold coils to failure. Was not<br />easy to make this configuration fail while cold.<br />I didn't measure, but I'm sure it was more than<br />2:1 from packed to failed... Didn't think to try<br />this hot... KD5whateverAnonymousnoreply@blogger.com