WWII Half track . . The long anticipated WWII Halftrack. I have been waiting a while to post this. As you can tell from the main photo, I've been experimenting with GIMP. I think it turned out pretty good.
With 9 motors, this is the biggest creation I have made yet.
There are a few things that are off a little, but overall, I'm very pleased with it. Pointed to the sky, just imagine the noise as these guns fire off, slamming through an enemy plane.
As you can see, the back springs are compressed pretty far. This is because of the weight. I have:
2 battery boxes
2 XL motors to drive the track
4 m motors connected together to drive the wheels
1 m motor for steering
1 m motor for turret turning
1 m motor for gun lift
Steering motor, and quad front shocks to hold up the weight.
3 IR receivers 3 channels are devoted to drive motors
The pivot motor, with worm gear drive, it isn't very solid, but it works quite well. Also the two battery boxes. On with the red switch, and the other below the pivot motor. I also have two switches, the one on the left is for the lift motor in the turret. The other is to get 2IR receiver to reach the bottom battery pack.
This is my lift motor for the turret. Geared down to 1:216
Side view. It's pretty cramped
2 XL drive motors for the track. I geared them down to 1:2.779
Bottom, with drive line to the front. I used 4 m motors for the front drive system. I could have went and bought another XL motor or two, but I wanted to make a "Power block" out of the motors I already had.
I used 6 16 tooth gears to make sure I had even load distribution on the motors. The front drive is geared down to 1:8.337. I had to use my brain and do a little math on this creation to get the wheels and track to turn at the same speed. I calculated the circumference of the wheels, and the sprockets. This gave me the distance they traveled in one rotation, I then made a ratio of how many times the sprocket turns to one turn of the wheel. (2:1 if I remember right.) I then found this handy little web site from Sariel, that calculates gear ratios. It also gives you theoretical RMP, and torque outputs. All I had to do from there, was find a gear ratio for the wheels that double the RMP of the tracks.
The 360 degree spin
The rear features a ladder to get up to the quad AAA gun. I did not have any pictures of the rear of one of these, so I just kinda made it up.
Front features independent suspension.
Close up of gun.
I used 3 turn tables on this, one for the spin motion, and one for each set of guns.
Turret turns 360 degrees.
The suspension on the tracks. I broke one of my yellow shocks, so I put two grey ones on the back.
Looking down the guns.
Guns rotate all the way down. Imagine being infantry... this would be devastating.
Keep your eyes to the skies! Thanks for looking!!