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Old 15th September 2013, 12:22 PM   #61
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$0.60 per gram from me.
Sweet, they are around 12-15g each. Just waiting on some digital calipers to arrive and I'll get it drawn up.

Will I need to draw in supports for printing? Or does the cam software figure all that out?

Cheers
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Old 15th September 2013, 12:59 PM   #62
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Originally Posted by Renza View Post
Sweet, they are around 12-15g each. Just waiting on some digital calipers to arrive and I'll get it drawn up.

Will I need to draw in supports for printing? Or does the cam software figure all that out?

Cheers
The software does all that for you.
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Old 20th September 2013, 12:16 AM   #63
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I've got a somewhat difficult part here if anyone can handle it.


Click to view full size!

Dimensions are 46x46x16mm.

The tricky parts:

- Lots of overhangs; support material will be necessary

- There's a grub screw threaded into the plastic, and it'll be pretty tight. I suspect it'll just tear through ABS. At the moment I'd prefer not to have to have captive nuts in there, although it's always an option if all else fails.
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Old 20th September 2013, 7:52 AM   #64
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I'm happy to give it a go.
It's not very large but my machine should be able to get enough detail into it.
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Old 20th September 2013, 9:21 PM   #65
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Sounds good. Would you prefer SolidWorks or STL format?

The central hole in particular needs to be a pretty tight fit for a 3mm shaft. With your printer, should I specify a 3mm hole, or is it better to make it maybe 3.2mm?
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Old 20th September 2013, 9:35 PM   #66
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Sounds good. Would you prefer SolidWorks or STL format?

The central hole in particular needs to be a pretty tight fit for a 3mm shaft. With your printer, should I specify a 3mm hole, or is it better to make it maybe 3.2mm?
STL thanks.
It'll be pretty cheap to make, so make one of each.
If you only want one though better make it a 3 mm hole. If it's not quite large enough then run a 3 mm drill bit through it.
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Old 20th September 2013, 10:15 PM   #67
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Agree with the drill bit, the quality of a printed hole usually won't guarantee any particular good fit without quite a bit of trial and error.

Another method not involving the use of a drill bit is to change the shape of the hole, though sizing it properly still requires knowledge of your printer's and plastic's behaviour using the print settings chosen.

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Old 20th September 2013, 10:17 PM   #68
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Let's go with a single 3mm one for now. I'm sure that there'll be changes to be made after this one anyway. The eventual aim is to have four, two of which will be mirror images. I'll send you the file shortly (I'm just doing a quick update to add captive nuts).

If anyone is interested, these are wheels for an RC plane. The reason they're custom made is that they have to be small enough to fit into the undercarriage bays when retracted, but big enough to fit a brushless motor inside to provide electromagnetic braking on landing. Ideally I'd like to be able to taxi with them too, but I suspect that with a sensorless motor I'd have a minimum taxi speed of about 5m/s - which would get a little bit interesting.
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Old 20th September 2013, 10:20 PM   #69
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Let's go with a single 3mm one for now. I'm sure that there'll be changes to be made after this one anyway. The eventual aim is to have four, two of which will be mirror images. I'll send you the file shortly (I'm just doing a quick update to add captive nuts).

If anyone is interested, these are wheels for an RC plane. The reason they're custom made is that they have to be small enough to fit into the undercarriage bays when retracted, but big enough to fit a brushless motor inside to provide electromagnetic braking on landing. Ideally I'd like to be able to taxi with them too, but I suspect that with a sensorless motor I'd have a minimum taxi speed of about 5m/s - which would get a little bit interesting.
Okay now I have to make them so you can make a video of that. Sounds like it'll be fun to watch!
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Old 20th September 2013, 11:15 PM   #70
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Yes, especially since the ESCs are either braking or not braking - you can't adjust the braking force. I suspect that on the first landing it'll be largely uncontrollable once it touches down.

I've sent the file though.
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Old 21st September 2013, 8:43 AM   #71
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Hope you have a nose wheel and not a tail wheel on this landing gear!
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Old 22nd September 2013, 2:25 AM   #72
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Hi Billzilla,

here's the STL file for the bracket I need printed. Needs to be solid fill pls

https://www.dropbox.com/s/cyd4f5mzuq...le_bracket.stl



does this seem fine to print? need two copies!

let me know if you want a pm to sort out the rest of the details!

cheers
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Old 22nd September 2013, 6:59 AM   #73
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Hi Billzilla,

here's the STL file for the bracket I need printed. Needs to be solid fill pls

https://www.dropbox.com/s/cyd4f5mzuq...le_bracket.stl

image

does this seem fine to print? need two copies!

let me know if you want a pm to sort out the rest of the details!

cheers
Okay got it.
Can't do solid fill but with the densest infill two of them come to 35 grams, so at $0.60 per gram that's $21.60 plus postage.
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Old 22nd September 2013, 10:40 AM   #74
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Okay got it.
Can't do solid fill but with the densest infill two of them come to 35 grams, so at $0.60 per gram that's $21.60 plus postage.
Should be fine hopefully! will send you a PM later on to sort out payment
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Old 22nd September 2013, 10:05 PM   #75
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Quote:
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Okay got it.
Can't do solid fill but with the densest infill two of them come to 35 grams, so at $0.60 per gram that's $21.60 plus postage.
Hey Billzilla, whats the best way to contact you for payment? you have PMs off!
cheers

edit: dw, found your email address above. emailing you now!
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