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Strong & Flexible plastic [message #68481] Wed, 22 May 2013 08:10 UTC Go to next message
avatar Robotex  is currently offline Robotex
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What is the border between flexibility and strength? What minimal thickness can have wall to be strong?
Re: Strong & Flexible plastic [message #68508 is a reply to message #68481 ] Wed, 22 May 2013 19:31 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
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It all depends on the material. Here are the guidelines for Strong & Flexible Plastic
http://www.shapeways.com/materials/strong-flexible-design-gu idelines


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Re: Strong & Flexible plastic [message #68530 is a reply to message #68508 ] Thu, 23 May 2013 09:14 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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For example, is it possible to print pulley belt from Strong & Flexible plastic? What dimensions can it have?

[Updated on: Thu, 23 May 2013 09:16 UTC]

Re: Strong & Flexible plastic [message #68579 is a reply to message #68530 ] Thu, 23 May 2013 23:26 UTC Go to previous messageGo to next message
avatar FreeRangeBrain  is currently offline FreeRangeBrain
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It is most definitely possible to print a belt pulley in any material available here. Failure of the pulley will depend on several other factors: speed, power, size, misalignment, belt type, etc.

Asking whether a material is strong enough is a bit vague. For example...

"Are bricks a strong building material?"

"Yes, if you're building a house. No, if you're building the Eiffel Tower."

WSF is sintered nylon, as the material pages will tell you. Expect it to perform to a lower standard than solid (bar stock, sheet, or molded) nylon of the same variety. Part geometry will contribute significantly in determining if the part is strong or weak, pliable or brittle, soft or hard.


Creativity - sometimes by the brute force method.
Re: Strong & Flexible plastic [message #68972 is a reply to message #68579 ] Fri, 31 May 2013 12:40 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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I need to print this from S&F plastic (chain and gears):
http://upload.wikimedia.org/wikipedia/commons/0/03/Chain.gif

What are the smallest dimensions can it has?

I need gears with diameter about 1.5-2 cm and thickness about 0.4-0.5 cm and space between gears about 30 cm. What chain can be printed for this?
Re: Strong & Flexible plastic [message #68976 is a reply to message #68972 ] Fri, 31 May 2013 13:01 UTC Go to previous messageGo to next message
avatar AmLachDesigns  is currently offline AmLachDesigns
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The info you need is all on the Materials page:

Min Wall Supported: 0.7mm
Min Wall Free: 0.7mm
Min Wire Supported: 0.8mm (Unpolished) · 0.9mm (Polished & Dyed)
Min Wire Free: 1.0mm
Max Bounding Box: 650x350x550mm (White) · 230x180x320mm (Black) · 150x150x150mm (Polished & Dyed)
Min Escape Hole: 4mm (1 hole) · 2mm (2 holes) · Big models require multiple holes
Interlocking or Enclosed Part?: Yes
Multiple Part per STL: Yes
Clearance: 0.5mm
Accuracy: ± 0.15mm, then ± 0.15% of longest axis

Your chain will have to obey all these, and the critical factor will probably be the Clearance. Also you might end up with problems with the limit on the number of triangles, depending on how you design and how many links you want.

Have you considered using a toothed belt instead? Some motor cycles use these, so they must work and the geometry is much simpler than the set up you propose. It might work in wsf (or might not, the belt would have to be thin and could not bend too tightly) or you could try the new material.
Re: Strong & Flexible plastic [message #68977 is a reply to message #68481 ] Fri, 31 May 2013 13:05 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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You should be able to get all your information from the guidelines. If it's meant to go at the speed of your animation, you shouldn't have a problem.


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Re: Strong & Flexible plastic [message #68979 is a reply to message #68976 ] Fri, 31 May 2013 13:14 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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AmLachDesigns wrote on Fri, 31 May 2013 13:01


Have you considered using a toothed belt instead? Some motor cycles use these, so they must work and the geometry is much simpler than the set up you propose. It might work in wsf (or might not, the belt would have to be thin and could not bend too tightly) or you could try the new material.

I read guidlines, but it didn't give me answer to a question "When S&F plastic will be strong and when will be flexible?"

I thought about toothed beld, but I don't know is it possible to print it with S&F plastic and what dimensions it must have to be flexible.

I need about 5X speed than in animation.
Re: Strong & Flexible plastic [message #68982 is a reply to message #68481 ] Fri, 31 May 2013 13:26 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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The thicker you make WSF, the less flexible it will be. It's comparable to polypropylene in it's strength and flexibility. You can push it and pull it, it wont break easily. It will bend though but will more than likely spring back into position with force removed.


The Mad Moder
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Re: Strong & Flexible plastic [message #68983 is a reply to message #68982 ] Fri, 31 May 2013 13:44 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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What is the Min Escape Hole?
Re: Strong & Flexible plastic [message #68987 is a reply to message #68481 ] Fri, 31 May 2013 14:05 UTC Go to previous message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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You mean the requirements or definition?
The requirements are Min Escape Hole: 4mm (1 hole) · 2mm (2 holes) · Big models require multiple holes
Escape holes are for hollow models, to remove support material. In the case of WSF, the support material is unsintered Nylon.


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