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Old Jan 23, 2013, 03:09 AM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
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Here's what I've come up with for the motor. 20mm cases with and without a flange and a 3 blade rotor. I've made the rotor shaft hole 0.95mm so that it will be tight on the motor shaft - even if it has to be slightly reamed. There are no mounting lugs as the motor doesn't have screw holes. A drop of CA to lock the motor in place is the plan. I was going to put a face plate with locator lugs for 2 of the cooling holes of the motor at the front of the motor mount to make the motor more secure but with only 4.4mm total shaft length, I thought since the motor is getting tacked into place anyway, every bit of shaft should be made available to keep the rotor on true.
Printing material will be "frosted ultra detail" and total cost for 2 cases and 2 rotors comes in at around $18 (~9 dollars per complete unit).

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Old Jan 23, 2013, 04:14 AM
Life begins at transition
Australia, VIC, Sale
Joined May 2007
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Holy jeezuz! That's tiny!

If there's no mount, could you glue the stators directly to the motor? Get a tiny bit more FSA?
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Old Jan 23, 2013, 04:40 AM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
11,194 Posts
Hi Ody. Good call but the stator vanes are only around 0.5mm thick so the motor mount gives bracing to them - even that is only 0.5mm thick. I am not sure what sort of load the motor can handle yet - the blades may need to come down in size for all I know.

Hopefully I can order up soon. I still have another fan project to draw up and include in the order so I make the 20 bucks shipping each time worthwhile.
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Old Jan 23, 2013, 06:06 AM
Life begins at transition
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0.5 mm? Will that print OK?

That shipping thing's a rort. They used to be cool!
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Old Jan 23, 2013, 07:29 AM
Micro Jet Pilot
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Joined Jul 2005
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Very nice design Nitro. 0.5mm should be fine in the frosted ultra detail. At least Nitros 10mm fan came out nice for me. I looked at the accuracy of that process and it seems like the 0.3mm wall thickness is not really a hard limit. They can process clearance of 0.05mm and the accuracy is given as 0.025-0.05mm. This seems to not far from the Plunkett stuff, but at about 1 1/2 orders of magnitude cheaper Strength wise, the frosted ultra detailed 10mm fan at least survived 110krpm without a problem, I think the material is strong enough, but I know Dave is pushing the limits extremely. So don't forget to wear safety glasses The point about the 0.3mm thickness limit seems to be that large thin areas can warp, but these very small areas of the trailing edges should be fine in that sense. I bet we could design them down to 0.1mm or even less. The question remains how to convince shapeways to process it, if we take the risk. I really love that shapeways stuff. Nitro really got me into it with his first 10mm fan Thanks again for your nice work...

Chris


P.S.: I asked shapeways if they would print thinner structures if we take the response, but they won't since broken off parts might mess up the machine. Anyway, the 0.3mm blades on the 10mm fan don't look bulky. Should be ok and some sanding might help. I wonder if it makes a difference at all in terms of efficiency, maybe a low blade count with with large chord is better under these circumstances. This is what Nitro is going for obviously
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Last edited by Chris T; Jan 23, 2013 at 10:26 AM.
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Old Jan 23, 2013, 03:14 PM
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Denver, CO
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I think the real issue with thin printing is it will add so much time to the print, since they print by layers.
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Old Jan 23, 2013, 05:21 PM
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Just wondering, would there be any performance advantage making this a pusher ?
Thanks.
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Old Jan 23, 2013, 05:38 PM
**I'm Battman**
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Twin Falls, Idaho
Joined Jan 2005
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Quote:
Originally Posted by NitroCharged View Post
Here's the 8mm inrunner next to HH's 10mm inrunner from their Mig15.
Specs:
Motor diameter: 8mm
Motor length: 18.6mm

Shaft: 1.0mm in diameter
Shaft length: 4.4mm protruding

Weight: 3.6g AUW

There are no screw holes - only cooling holes.

8mm.
Sweet!

Many thanks for the specs!!

rc
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Old Jan 23, 2013, 08:17 PM
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Keeping an EYE on you guys. . Very interesting developments.

Ksqm
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Old Jan 23, 2013, 08:19 PM
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Hampton, VA
Joined Mar 2009
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NC,

Forgot to ask. How are the bearings on this motor?

Ksqm
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Old Jan 23, 2013, 10:24 PM
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Commonwealth of Puerto Rico
Joined Jun 2011
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I think it have bronze bushinds instead of bearings
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Old Jan 23, 2013, 11:42 PM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
11,194 Posts
Yes it does. Good call Jahel !

I may end up replacing them with 1mm bearings. I'm surprised they didn't come with them actually.
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Old Jan 24, 2013, 12:24 AM
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Joined Dec 2011
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Micro 262?


Mendo
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Old Jan 24, 2013, 07:08 AM
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Micro A-10
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Old Jan 24, 2013, 10:08 AM
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Quote:
Originally Posted by mendo View Post
micro 262?


Mendo
+1 !!
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