Fine wire tensile strengths?
in [Design]
|
Prev: Anushka for Shape FX Hot Shot Thigh Gel
Next: Archie and Green Xenon - How many usenet misfits have Aspergers?
From: Ken S. Tucker on 30 Jul 2010 22:01 I've been asked to 'light-up' aircraft models, such as, http://www.flickr.com/photos/35156618(a)N03/4754110575/ It is suspended from a rope. I need to use very fine 120V wire (like magnetic wire), the model uses 8# test monofilament right now and weighs 1/2 # , but a strong wind requires that 8# test. Is there a table that gives wire gauge & tensile strength? The current will likely be a max of 1/2 amp. Ken
From: Spehro Pefhany on 30 Jul 2010 22:49 On Fri, 30 Jul 2010 19:01:37 -0700 (PDT), the renowned "Ken S. Tucker" <dynamics(a)vianet.on.ca> wrote: >I've been asked to 'light-up' aircraft models, such as, > >http://www.flickr.com/photos/35156618(a)N03/4754110575/ > >It is suspended from a rope. >I need to use very fine 120V wire (like magnetic wire), >the model uses 8# test monofilament right now and weighs >1/2 # , but a strong wind requires that 8# test. >Is there a table that gives wire gauge & tensile strength? >The current will likely be a max of 1/2 amp. >Ken You can pick the material and look up the yield strength. In Imperial units, maybe steel wire (like music wire) you could use 300,000 PSI, say. So for something that would break at 20lbs you would need 7E-5 in^2, which is about 0.01" diameter, if I did the sums correctly. You should calculate and test the strength and self-heating effect before using it, of course. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: Tim Williams on 30 Jul 2010 22:56 If you need it really fine, check out piano wire -- though plain carbon steel, the finer stuff is actually as strong as the best alloy steels! If you want copper wire, I suppose electrical wire is not normally specified for it, but it's just 100 alloy copper, which I see listed as 4.8 KSI tensile yield (annealed) to 48.4 KSI (cold drawn). Electrical wire usually feels like it's in the half- to full-hard condition, so it should be around 20 KSI or better. Be sure to mount it securely so it doesn't dig into the insulation and short out or anything. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Ken S. Tucker" <dynamics(a)vianet.on.ca> wrote in message news:7ee71397-e9fe-480f-890c-102033da3a4f(a)j9g2000yqn.googlegroups.com... > I've been asked to 'light-up' aircraft models, such as, > > http://www.flickr.com/photos/35156618(a)N03/4754110575/ > > It is suspended from a rope. > I need to use very fine 120V wire (like magnetic wire), > the model uses 8# test monofilament right now and weighs > 1/2 # , but a strong wind requires that 8# test. > Is there a table that gives wire gauge & tensile strength? > The current will likely be a max of 1/2 amp. > Ken
From: Grant on 30 Jul 2010 23:09 On Fri, 30 Jul 2010 19:01:37 -0700 (PDT), "Ken S. Tucker" <dynamics(a)vianet.on.ca> wrote: >I've been asked to 'light-up' aircraft models, such as, > >http://www.flickr.com/photos/35156618(a)N03/4754110575/ > >It is suspended from a rope. >I need to use very fine 120V wire (like magnetic wire), >the model uses 8# test monofilament right now and weighs >1/2 # , but a strong wind requires that 8# test. >Is there a table that gives wire gauge & tensile strength? >The current will likely be a max of 1/2 amp. >Ken Stainless or piano wire? Stronger than copper. You can do it without insulation from insulated mounts above and in the model? I don't remember seeing tensile strength tables for wire. You'd need to watch for fine wire heating vs loss of tensile strength too. Grant.
From: John Larkin on 31 Jul 2010 00:07
On Fri, 30 Jul 2010 19:01:37 -0700 (PDT), "Ken S. Tucker" <dynamics(a)vianet.on.ca> wrote: >I've been asked to 'light-up' aircraft models, such as, > >http://www.flickr.com/photos/35156618(a)N03/4754110575/ > >It is suspended from a rope. >I need to use very fine 120V wire (like magnetic wire), >the model uses 8# test monofilament right now and weighs >1/2 # , but a strong wind requires that 8# test. >Is there a table that gives wire gauge & tensile strength? >The current will likely be a max of 1/2 amp. >Ken 8 pounds breaking strength is about about #26 regular soft copper, #28 hard-drawn copper, #30 copperclad steel. Any of them can easily handle half an amp. That's extrapolating from the wire tables in an old copy of "Reference Data for Radio Engineers", a very handy book. I'd suspect that #30 piano wire, 10 mil diameter, would be fine at half an amp too. John |