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What material for prototype ? [message #22050] Sun, 02 January 2011 18:29 UTC Go to next message
avatar XXL66  is currently offline XXL66
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Registered: January 2011
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Hi, i'm building a multirotor prototype heli.

http://img337.imageshack.us/img337/3483/a6500c.jpg
I would need the chrome parts and
http://img692.imageshack.us/img692/1746/a6550poot.jpg
this landinggear holder.

To give a size indication: the carbon tubes are 20mm outside diameter.

Are the materials strong enough for mechanical objects to use in a prototype ?

Is there any weight/material indication available ?

ty !
Re: What material for prototype ? [message #22058 is a reply to message #22050 ] Mon, 03 January 2011 06:14 UTC Go to previous messageGo to next message
avatar reecejames  is currently offline reecejames
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Hello,

From the looks of these parts, I would be printing in white strong flexible due to cost, weight and accuracy of the models. WSF should be enough to get you a couple of test flights without worry.

Personally, I would be adding some vertical bracing to both of these objects as they will inherently bend in that plane. The look good in the renders, but printed or cast in that shape, they will either bend, crack of fail.


Reece James
Integration Engineer
Re: What material for prototype ? [message #22070 is a reply to message #22058 ] Mon, 03 January 2011 13:59 UTC Go to previous messageGo to next message
avatar XXL66  is currently offline XXL66
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ok, thx, i have adjusted the designs somewhat, i will give "strong white flexibel" a try.
Re: What material for prototype ? [message #22115 is a reply to message #22070 ] Tue, 04 January 2011 12:41 UTC Go to previous messageGo to next message
avatar reecejames  is currently offline reecejames
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Here's a datasheet with more detailed info on the WSF. Basically, you would shatter your servos's plastic before the part would shear in WSF, but it will bend.

Whenever I'm estimating the strength of a part, I think about how you would go about destroying it, bending, sheering, compressing, heating it up, freezing it, how much electrical charge is it isolating etc.

This case, what planes will it bend in easily. Here is a good example of a bracket with very little material, but is designed to not bend in the vertical plane.

Best of luck with this model, look forward to you getting it into the air!


Reece James
Integration Engineer
Re: What material for prototype ? [message #22116 is a reply to message #22115 ] Tue, 04 January 2011 12:45 UTC Go to previous messageGo to next message
avatar XXL66  is currently offline XXL66
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hi thx, i already uploaded and ordered the parts yesterday. I have to get used to the idea they will be delivered very soon. It's awesome.
Re: What material for prototype ? [message #22138 is a reply to message #22116 ] Wed, 05 January 2011 02:15 UTC Go to previous messageGo to next message
avatar stannum  is currently offline stannum
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PDF: "Melting point DIN 53736 172 - 180 °C, Vicat softening temperature B/50 DIN EN ISO 306 163 °C"
SW: "Heatproof to 80 ºC"

Where is the trick? A typo? Complete different meanings of "melt" and "heatproof"?
Re: What material for prototype ? [message #22139 is a reply to message #22138 ] Wed, 05 January 2011 04:05 UTC Go to previous messageGo to next message
avatar reecejames  is currently offline reecejames
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The datasheet I believe is from the manufacturer. I believe melting point is probably where the material becomes a fluid (172-180ºC) while SW is stating it will keep most mechanical properties up to 80ºC without issue. A derating of 50% from the 163ºC softening point is probably not unreasonable.


Reece James
Integration Engineer
icon7.gif  Re: What material for prototype ? [message #25312 is a reply to message #22050 ] Sun, 27 March 2011 07:53 UTC Go to previous messageGo to next message
avatar XXL66  is currently offline XXL66
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http://img716.imageshack.us/img716/285/pt1holdb.jpg

it flies ! it flies great !

I completely redesigned and every part (gimbal also) other then tubes and plates are made with coloured WSF.

http://img140.imageshack.us/img140/4649/final3j.jpg
http://img822.imageshack.us/img822/5537/gimbalmounted1s.jpg
http://img534.imageshack.us/img534/892/gimbalmounted3s.jpg
http://img823.imageshack.us/img823/7307/kap1s.jpg
Re: What material for prototype ? [message #25421 is a reply to message #25312 ] Tue, 29 March 2011 19:35 UTC Go to previous messageGo to next message
avatar ana  is currently offline ana
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@XXL66 so very cool! Congrats.

Have you been modeling helicopters for awhile?


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Re: What material for prototype ? [message #25428 is a reply to message #22050 ] Tue, 29 March 2011 21:43 UTC Go to previous messageGo to next message
avatar reecejames  is currently offline reecejames
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Awesome! Nice bit of modelling, especially on the gimbal!


Reece James
Integration Engineer
Re: What material for prototype ? [message #25437 is a reply to message #22050 ] Wed, 30 March 2011 15:08 UTC Go to previous message
avatar XXL66  is currently offline XXL66
Messages: 20
Registered: January 2011
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thx,

it is my first multirotor design (or heli)
but unfortunally the coax drive has been patented as of 21/3/2011 so i had to go back to the drawing board.

Parts arrived today:
http://img853.imageshack.us/img853/9085/bovenbouw.th.jpg
http://img715.imageshack.us/img715/2174/motor6n.th.jpg
http://img24.imageshack.us/img24/2174/motor6n.th.jpg
http://img233.imageshack.us/img233/249/totaalp.th.jpg
http://img402.imageshack.us/img402/2937/totaal2.th.jpg
http://img839.imageshack.us/img839/1104/totaal3.th.jpghttp://img860.imageshack.us/img860/6905/gevouwen2.th.jpg
http://img17.imageshack.us/img17/3258/gevouwen.th.jpg
http://img856.imageshack.us/img856/8533/gimbal2.th.jpg
http://img231.imageshack.us/img231/9756/gimbal.th.jpg


 
   
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