Monday, April 29, 2013

More Quadcopter

With FRC finally over, I have been able to actually work on other things as well getting around to updating this, which I admit I do suck at a lot...

The more time I spent flying my Quadcopter the more I realized it was a bit undersized for flying with the GoPro and in general a bit to small (for my tastes).  So with this so called free time I build another one! I decided on using the same KK2 controller with a similar style frame, the KK2 for $25 is an amazing control board and with the new 1.5v firmware works even better. Auto level has been improved quite a bit since the first revision and now almost snaps to level instantly.

Now for the build. A nice photo montage to show some progress, I need to work on taking photos though out the build instead of just the end product...
The main plates are now G10/FR4 instead of delrin, 1/8 thick for the body and 1/16th thick for the landing legs.

However because of the epoxy and fiber bend of G10 I wasn't able to cut it with the laser since it just burned. So had to used the Tormach CNC mill, and using a brand new carbide 1/8th endmill at 5000 RPM I was able to go at it with 1/16th DOC at 40 IPM so it didn't take long. Designed in solidworks and then CAMed with HSMxpress as usual.

Because the G10 stock I got off McMaster-Carr had this horrible white color to it, everything got murdered out. And in all seriousness a good looking paint job, makes a bit difference in what people perceptive. It always happens in FRC where the painted/powercoated/anodized robots are always joked about being "mentor/sponsor built" and usually do perform better because they are better built.

In addition the arms are now thin walled aluminum, .5in square with 40 thou wall thickness, a good improvement over the polycarb box. Because getting this type of aluminum isn't an standard extrusion they are actually sourced from towel racks. And again I used the tormach CNC to drill all the holes for mounting. After I was done with that, I was able to bolt the the frame together! Held together with 4-40 SCHS and lock nuts.

This is probably one of the better/sexier looking things I have built, again the paint and machined tolerances gives it a good look. I do get people asking me if this was a kit, and it does kinda look like the Talon Frame Kit off HobbyKing (totally couldn't have bought that).  Well the rest of the work was just adding the electronics and wiring. I deiced to go with bigger NTN 35 1100kv motors  on 3S and 10x5 blades for what I figured to be the optimal life to power draw ratio. So more photos!

I am using my Spektrum DX6 radio and noticed that you can get $6 6 channel receivers on HobbyKing...... however this unit seemed to bugged out and I am replacing it with a legit Spektrum branded one, about 10x the cash but totally wroth it. Cheap Chinese electronics are cheap for a reason.

And here's the post build product shot! With Gopro which is just hanging with an adhesive mount, shock mount is in the planning. I added an LED light strip to the front which helps with orientation at night but besides there isn't really any aid for orientation.

And here's some goPRO Video!

Sunday, April 14, 2013

It's been awhile

I sure have been neglecting this haven't I.....
Well here's a little tl;dr:

1. FIRST Robotics 2013 happened: frisbees, pyramids, climbing yeah...
2. Moar Quadcopter.
3. Traxxas makes some nice trucks.
4. Moar Engineering.
5. I will be attending WPI Fall of 2013.

More to come.