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(Additional) Nerdy Derby Cars

Great White

There’s a great post over on the Milwaukee Makerspace site about Milwaukee’s First Nerdy Derby, including some sweet video, but I’m mainly going to talk about my own cars here. :)

I spent a lot of time before BarCampMilwaukee7 getting ready for the event, but I also found a bit of time to fabricate a bunch of parts for people to build cars with, so I was down to the wire when it was time for me to make more cars. I already had Poundin’ Sand, my fully laser-cut car, but I wasn’t content to just have one car. (I had heard Jim R. from the Makerspace had five cars. He didn’t race that many, as I think one or two of them exploded during testing.)

My second car was titled “Great White” and was a 3D print of Mr. Jaws. I ended up kicking out some quick axle mounts in OpenSCAD and just hot gluing them to the bottom of Mr. Jaws. They probably weren’t on straight, but I didn’t take the time to care. In the category of 3D printed cars… I still came in second! Ed managed to build an amazing 3D printed car, and the worst (best?) part is, he pretty much had the same idea as I did, but he managed to succeed. (Print time and print failure were the two biggest concerns for both of us.) I ended up using stock wheels instead of the 3D printed wheels I made a few weeks earlier, which seems silly as I could have gone for a full-on 3D printed car… oh well.

RasterMobile!

My third car was the RasterMobile! which actually consisted of a block of wood from a real Pinewood Derby kit, turned sideways, with two holes drilled all the way through, and 5/16″ threaded rod with inline skate wheels attached. I had skate bearings that seemed to turn well, I had some weight and mass, and it was painted black with RasterWeb! stickers on it. What could go wrong!?

So how did my cars do? I didn’t expect much out of Great White, as it was really light, and the wheels were probably not completely straight. It rolled down the track, so that’s all I can report on that one. I still think it looked cool and was a neat idea. The RasterMobile! didn’t do as well as I expected. I thought it would fly down the track, and I suppose it did, but the mass of it probably slowed things down too much at the bottom. I did get a some satisfaction that Gary saw the skate wheels, ran to his car and ripped apart his inline skates just to try to beat me with my own idea. :) Oh, the RasterMobile! also had an accident where it jumped out of its lane, so that certainly didn’t help things.

So which car did the best? Surprisingly it was Poundin’ Sand that performed the best out of my three cars. I wasn’t sure the laser-cut wheels would be up to the task, and I questioned whether not gluing the 3 layers that comprised each wheel together was a good idea or not, but it did alright!

Poundin' Sand

There’s been talk of doing another race in the future, so I may not be done building tiny cars…

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Mold Making

I’ve been digging into OpenSCAD lately and managed to come across this Flickr photo with the most minimal of explanation of how to do a reverse object in OpenSCAD, but it was all I needed…

Space Invader SVG

I started with the SVG file of the classic Space Invader character, sized to the width and height I wanted, and then exported it from Inkscape as a DXF file.

Space Invader STL

Once we’ve got the DXF we can pull that into OpenSCAD and extrude it into a 2.5 dimensional object. (It might be 3 dimensional, but I’m not going to argue 2.5D versus 3D right now.) 


linear_extrude(height = 10, center = false) import("spaceinvader.dxf");

After we compile the code we can then export our object as an STL file. We can then pull that STL file into OpenSCAD again for the next step…

Space Invader STL (reversed) 


difference() {
	translate([40,42,2.5]){
		cube([90,70,14.5], center=true);
	}
	# import("spaceinvader.stl", center=true);
}

You’ll need to tweak those numbers of course, and as for the # at the start of the import line, that’s to show us the object even when we can’t see it, as it were… sort of. It’s an OpenSCAD trick I learned from Mark Finn at BarCampMilwaukee.

So now that we’ve got the object dropped into a block (at the proper height) we can then export it as an STL file, which could be cut on a CNC machine, or 3D printed.

Space Invader G-code

I’ve not yet attempted to 3D print this, and I’ve had not much luck in printing things that are water-tight. I might try getting some silicone to coat the piece which would make it water-tight, and food-safe.

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BarCampMilwaukee7

BarCampMilwaukee7

Whew! It’s BarCampMilwaukee time! This weekend, October 6th and 7th, 2012 is BarCampMilwaukee7… that’s the seventh BarCamp here in Milwaukee, for those of you keeping track.

I’ve got a few things I’ll highlight, the first of which is the Raspberry Pi Roundtable, where people who have Pis, or want to use a Pi for a project can get together and talk about them. Having a super-cheap Linux-powered computer opens up some new possibilities, so we’ll talk about what those are.

The session I’ve got planned is titled Money. Maker. Business. and I’ll talk about how I started up my making business. At Milwaukee Makerspace (and other hackerspaces) members often talk about potential business ideas, so my talk will outline the process I went through, including touching on my Maker Business posts.

Thirdly, we’ll be doing our own Midwest version of the Nerdy Derby race. If you haven’t made a car yet, make one now! If you can’t make one now, Milwaukee Makerspace will be providing miscellaneous parts during BarCamp so you can try to build one. And it’s not just all speed and aerodynamics, and there will be style points awarded as well. (We might even call them “Moxie” points as an homage to the Power Racing Series.)

(And yeah, I’m sure I’ll also bring the RepRaster 5000 and enjoy some 3D printing hijinx as well.)

So yeah, barcampmilwaukee.org has all the details. I hope you’ve already registered, because if not, we may not be able to feed you. Come anyway! We’ll figure something out, there are restaurants nearby, it’ll all work out, somehow, as it always does. :)

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Laser Kaleidoscope

Laser Kaleidoscope

We managed to get Milwaukee Makerspace invited to another gallery night, and this time we’re taking part in Bay View Gallery Night at Alterra, so I figured I needed a new project. And hey, what’s better than a deadline to get a project done? (It’s like college all over again… in a good way!)

Interociter

When I was at Maker Faire Detroit back in July I saw this laser spinner thingy called “The Interociter” and decided I had to have one. And by “have one” I mean “make one”… so I did.

(There’s some debate over whether it should be called a “Laser Kaleidoscope” or “Laser Spirograph” or “Laser Spinner Thingy” and while I do like “Laser Spinner Thingy” I also get sick of people thinking all my projects are Spirograph-inspired, so I went with Laser Kaleidoscope. Deal with it.)

Laser Kaleidoscope

Laser Kaleidoscope

So where were we? Oh yes, the project! It’s really simple: a laser is pointed at a mirror, and that reflects the laser onto another mirror, and that one reflects it onto another mirror, and then it shows up on the wall. You can make the motors spin by turning them on with a pushbutton, and then adjust the speed by turning the knobs. There are 3 motors (an earlier prototype had 4) and by setting them all to different speeds, you can get some crazy patterns going.

So how does it work? The laser hits the first spinning mirror, and creates what appears to be a circle. It’s really a single dot, but it’s spinning around so fast it looks like a circle. Add a second (and third) mirror, and since they all wobble just a little bit, you get much more than a simple circle.

Here’s a shopping list:

I say “shopping list” because those are the parts I (mostly) bought… Of these parts I’ll note that with the laser I leaned towards the “safe” side, but it can be difficult to see in well-lit rooms, so I may upgrade to this one at some point. The round craft mirrors came in a variety pack with different sizes. I may experiment with larger mirrors in the future.

Laser Kaleidoscope

Laser Kaleidoscope

There are a bunch more parts involved, one being the piece of wood everything is attached to, and the other parts were all designed and 3D printed by me. (OK, I had a little help with the knobs.)

The printed parts are:

  • (1) Laser mount
  • (3) Motor mounts
  • (3) Mirror mounts
  • (3) Knobs

(I also considered printing some small U-shaped things to hold the wires in place, but haven’t bothered with that yet.)

And yeah, this is why I have a 3D printer. The ability to digitally design something, rapidly create it, tweak it a bit and print a new one… that’s what I love.

My original plan was to make up a nice laser-cut case for this (I thought that would be appropriate) but with the lasers down for repair, I didn’t get that done in time. That’s actually fine, as I’ll probably end up redesigning things a bit before I’m totally done with it. So far though, I’m happy with the progress.

The video was quick & dirty, and really doesn’t do it justice, which is why you’ll need to come see it in person I guess. I figured I couldn’t write this post without including some sort of proof that it actually works. :)

Lasers! They’re awesome!

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Instructables + Laser = ????

VOTE!

So here’s the deal friends… Ben Nelson, fellow maker, DIY enthusiast, and Milwaukee Makerspace member, has won his fair share of contests over at Instructables, and it’s prompted me to give it a try as well, so I present to you my first Instructable: Creating Random Art for Puzzles.

And I’ll be totally honest, the main reason for me publishing it was to enter this contest to win a laser cutter from Hurricane Lasers. (I have no shame in telling you that!)

Ever since the Makerspace got a laser cutter, I’ve fallen in love, and it’s become my favorite tool, possibly even surpassing the RepRap. (Shhh, don’t tell the RepRaster 5000 that!) You’ve probably seen a few of my posts about things I’ve laser cut. Of course lately the laser cutter seem to break down every other week, so getting time to go to the space when it’s working is tough. Luckily, my friends at Lovesick Robot Studios helped me out with this project.

Laser-cut puzzle coasters

When I started on this project, I wasn’t even sure where it would go, but I wanted to explore the concept of introducing random elements into my art and see where it would take me. Well… this is the first stop: puzzles created with random art.

Puzzle: Solved!

Of course if you know me, you know I also love making coasters… so I made puzzle coasters with random art in addition to a normal puzzle. (The “normal” puzzle was made with a printer, some board, and an X-ACTO knife. All the details are in the Instructable.)

Puzzle? Coasters? Both!

So here’s the deal friends… I’d really appreciate if you vote for me in the contest, because if I win, I’ll get my own laser cutter… but rest assured, I won’t just keep it to myself. If you need something etched or cut, well, I may be able to help you out. I mean, if I win this contest. So yeah, I’d appreciate your vote.

So go to the page to vote. See the image at the top of this post which shows where the “VOTE” button is.) Also, since I took my sweet time, we’ve only got two days…. Voting ends the 20th, so don’t put it off… vote now! Don’t see the vote button? Make sure you log in. Don’t have an account? Create one!

Thanks!

Update: As of 2012-09-28 I have not been chosen as a finalist. Oh well.