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Bearings [message #74457] Mon, 09 September 2013 10:17 UTC Go to next message
avatar Robotex  is currently offline Robotex
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Registered: May 2013
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Junior Member
Hello.

Is it possible to print good bearings from nylon? How minimal size can it have?

If I have speed 500-1000 rpm with load do I need ball bearings? Will be friction between plastic surfaces with oil small in this case?

Best regards,
Nick

[Updated on: Mon, 09 September 2013 10:18 UTC]

Re: Bearings [message #74470 is a reply to message #74457 ] Mon, 09 September 2013 18:05 UTC Go to previous messageGo to next message
avatar FreeRangeBrain  is currently offline FreeRangeBrain
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Registered: April 2013
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Sintered nylon, being very porous, is not a good bearing material. Printed WSF (nylon) will not be accurate enough to produce a smooth, round bearing for those kinds of speeds, load or no load. You may try it if you like, but I wouldn't bet the farm on the results.


Creativity - sometimes by the brute force method.
Re: Bearings [message #74471 is a reply to message #74470 ] Mon, 09 September 2013 18:41 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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So, sleeve will be better in this case, am I right?
Re: Bearings [message #74475 is a reply to message #74471 ] Mon, 09 September 2013 19:51 UTC Go to previous messageGo to next message
avatar FreeRangeBrain  is currently offline FreeRangeBrain
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Yes. Just make sure you have a significant area in the journal. The surface is like sandpaper except that the sand is nylon and something on the order of 400 grit as a raw powder with roughness increased depending on "clumping" as sintered and resolution of the print voxels. Expect the bearing to seat in fairly quickly as the higher lumps wear off. You haven't mentioned your intended shaft diameter, so keep the surface speed in mind and try to limit the loading so as to minimise heat input - excessive heat will make your nice nylon bearing a viscous nylon coupling!

[Updated on: Mon, 09 September 2013 19:53 UTC]


Creativity - sometimes by the brute force method.
Re: Bearings [message #74478 is a reply to message #74475 ] Mon, 09 September 2013 21:08 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
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What material can I use to get good rotations?
Re: Bearings [message #74479 is a reply to message #74478 ] Mon, 09 September 2013 22:11 UTC Go to previous messageGo to next message
avatar FreeRangeBrain  is currently offline FreeRangeBrain
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You haven't given anywhere near enough information to render an engineering opinion, let alone my lack of intimate knowledge of the performance characteristics of the individual materials offered by Shapeways. Take a long, careful look at each material's specification page, including the tolerance and print resolution data. For something as precise as a bearing usually is, I can't recommend any of them for anything more than trivial use. If it's something as simple as a child's pinwheel, anything will do. If it's going to see appreciable loads or speeds, I'd simply use an off-the-shelf bearing. (Your local hobby shop may be of particular service in this area.)


Creativity - sometimes by the brute force method.
Re: Bearings [message #74508 is a reply to message #74479 ] Tue, 10 September 2013 16:20 UTC Go to previous messageGo to next message
avatar Robotex  is currently offline Robotex
Messages: 11
Registered: May 2013
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Junior Member
Stainless Steel has the same problems, am I right?
Re: Bearings [message #74535 is a reply to message #74508 ] Wed, 11 September 2013 03:37 UTC Go to previous message
avatar FreeRangeBrain  is currently offline FreeRangeBrain
Messages: 233
Registered: April 2013
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At the very least, accuracy. Right.


Creativity - sometimes by the brute force method.

 
   
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