Armageddon421's Hackingblog

Tag: qwood

AutoQuad in the air!

by on Jun.24, 2014, under Multicopter

Obviously, I ditched the wooden frame due to vibration issues. The AutoQuad‘s regulators and algorithms are quite advanced and therefore require a somewhat un-crappy frame to work well. It kind of flew well with the wooden frame, but the vibrations caused issues regarding height-stabilization. In manual mode, I could barely hover the thing without it going spontaneously up and down.

Some Aluminum rods and a bit of scrap acryllic cut with the lasercutter at shackspace made up the new frame.

I also noticed that the whole thing was much to light. The RPM of the propellers were far below the point of maximum efficiency. Instead of using smaller props, I decided to increase the load. What better load could I use than more batteries? So I went and bought two hacker 5000mAh 3s packs and tucked them under the quad. That first flight was actually my first time flying more than about 15 minutes. Adding up the flight times, the batteries lasted about 28 minutes, which is quite impressive, regarding that the first few cycles of Lithium Poymer batteries usually yield a bit less capacity. I’m happy if it flies 20 minutes carrying a GoPro and a brushless gimbal later.

Here is a video I spent hours editing. It mainly shows the position hold and return to home functionalities of the AutoQuad.

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qwood – Wooden quadcopter frame

by on May.26, 2014, under Multicopter, Projects

A while ago I built a small quadcopter testbed by sawing a cross out of a laminate floor tile. This works, but is ugly. Normally, for a “test”, this doesn’t matter. However, in the scope of my student project, I got my hands on an Autoquad. Since I should include pictures of my testbed in the documantation for the project, I decided that I needed a somewhat nice looking frame for the thing.

I bothered my head about a nice design for a wooden frame. I took about two weeks until I finally got around to actually start designing it. I also felt like I should give solidworks a try. This was in an early stage:

qwood - early stage

This weekend, I was at shackspace, finalizing the design and using the laser cutter to cut the 3mm birch wood I got from Balsabar. Apparently, you can tell them what quality grade of wood you want in the comment section before placing the order. I did not know that, but the wood I received had only a few knots, which is okay. Especially if you compare it to wood from the hardware store.

I found the nice rendering feature of solidworks, so here is a rendering of the final design:

qwood - rendering

I intentionally left out the connection piece on the bottom of the landing gear (you can see the slot for it) because I was still unsure of how to go about it and finally wanted to see some results. There will definitely be something to make the landing gear sturdier.

I had huge problems lasering it with a snug fit. The kerf compensation feature, or “sew compensation” as the cheap china software  “LaserWorksV5″ calls it, somehow always crashed the software. Turns out in that version they broke it for circles. Yeah. Right. You couldn’t even laser a simple kerf-compensated circle. Unfortunately, that took me 2 hours to figure out. It worked when I used an older version of the laser software I had still lying around on my disk. It was also somewhere around this time that I came up with the name “qwood”.

Even with the kerf compensation working (or did it?), I could not get the precise fit I was hoping for. I had to sand the intelocking tabs and the corresponding holes to finally make it fit. Anyways, have a look at the result!

qwood - reult

I have some more pictures over at Imgur!

Also, have a look at how the parts are connected. There is no glue! Just nylon screws and nuts.

qwood - screws

I guess this thing is far from perfect and still untested at this point. Although it weighs only 167g, it feels pretty stable. My only concerns are the landing gears and torsion stability.

Next up: Electronics!

Drop a comment if you like it or have questions, ideas and suggestions!


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