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 September 07, 2009, 11:51:08 AM
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Newbie
Posts: 15
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Would you be up for posting the Sketchup file for those of us who might be able to get access to a cnc and might want to tweak it a bit?
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September 07, 2009, 07:40:15 PM
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Newbie
Posts: 3
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What kind of manufacturing process is he using? Laser cutting? Do you know what kind of machining capabilities he has?
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September 14, 2009, 12:52:53 PM
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Newbie
Posts: 3
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Hey Mikro, I have access to a laser cutter as well, and could cut stuff for you for free if you want. (You'd have to cover the material and shipping, but the cutting wouldn't cost you anything.) I couldn't do production stuff, but prototyping wouldn't be a problem. I wouldn't have any problem with copies of my frame being sold. I could even send you some files for different sizes if you wanted, though anything above 8" props it gets kind of impractical to use that design with polycarbonate.  (Above that and aluminum makes much more sense.)
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September 18, 2009, 10:59:09 AM
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Group: Global Moderator
Full Member
Posts: 246
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Fred or any other mechanical engineer types, what's the best plastic to use that is light, stiff, but can take the impact of a quad crash? I've used acrylic and ABS plastic so far. I accidentally bought Lucite before... it's VERY stiff but ultra heavy. Besides polycarbonate are there other good plastic candidates to try?
I am not qualified to even play a mechanical engineer on TV, but that being said I am picking up my new frame tomorrow morning. Its based on your designs Mikro but I re-did the middle section. (also in the process converted the design to a svg file). The place I am getting it laser cut suggested that I try Birch (there was a specific type but I can't remember it off the top of my head right now). They said it was more durable and repairable then the plastic and actually lighter. I'll know more tomorrow when I pick it up, and I'll post pictures as soon as I get it. chris.
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September 19, 2009, 05:33:01 PM
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Group: Global Moderator
Full Member
Posts: 246
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Nice! Looking forward to seeing how it turns out. Which version did you start from? I have a v1.1 in the repository with the latest fixes after talking to an ME friend.
I think its based on the repo version. I tend to just pull the trunk branch from svn and play there. The frame cutting turned out wicked. Smells awesome :-) Love burnt wood. The wood is Baltic Birch, and the guy who cut the stuff for me recommended Italian Poplar as it would be lighter and almost as stiff, but he didn't have any in stock at the time. Still need to put it together, but I am happy with it so far. Enough talk... Time for some pictures. Base Plate, Middle Ring, and Top Plate  Arm components  Arm assembled. I need to cut the threaded rod and also create some standoffs for in between the wood pieces with some carbon tube I picked up.  Another angle of the assembled arm  Base plate, arm and middle plate. Threaded rod will go all the way from the base plate up into the top plate with standoffs to create space.  Another shot of the arm, base and middle plates  The arm slips under the base plate when attached  I already have a 2nd revision of the design ready for when I crash this version. It will reduce the weight a bunch by removing some un-needed material. I don't have motor mount holes cut yet cause I didn't know the exact spacing so I didn't put them in the design. But as I am assembling this one I'll add them in so they get cut. I'll post some more pictures as I get it built up. chris.
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September 20, 2009, 07:28:55 AM
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Group: Global Moderator
Full Member
Posts: 246
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NICE Pyjamasam! In asking Pololu about alternate materials, they suggested balsa wood. Please let us know how sturdy birch it is! How much did it cost (if I may ask)?
It cost me about $60 CDN (cost of material and cutting) and I got it essentially overnight. (Ordered thursday, it was cut that night and I picked it up saturday morning) I see you already noticed that things are a little "over structured" :-) Your only using one of the x struts. I think my 3 are super overkill and will most likely move to a single one as well. The 4-40 threaded rod is a pain in the butt to cut and fiddle with so I am going to look for some bolts on monday to replace that with. I have one arm together (not glued yet though) and its fairly rigid. I think it will work quite well. I have some more ideas and changes I want to make to the design and I'll do that on monday. After that I'll post the file up for people to take a look at. chris.
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