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| Gears are from Tamiya Educational Construction
Series No.30
Motors are from 455 Servo of Modelgraft. The power of the motors is enough to drive the linked tracks but not to break them. It is a little bit bigger and 1.7 time powerful than 444, which was used on the M5A1 kit. Since the motors are small enough to let a servo be positioned in the middle of them, I got an idea of using the servo to speed down the motors with springs to get a right or left turn. The motors are more powerful than I thought - the motor would not stop fully even the spring is pushed to its end. A solution for this is to use a switch to turn off the motor when the spring is pushed into a certain position. This switch is same as in the M5A1 kit. |
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| SK-17 Wrokable Tracks and Sprocket for Panzer
III from Modekasten were used for better effort.
The track links were painted before any construction. I drilled 0.4mm x 5mm tunnels from 2 sides. Of course, if it is not diffcult, drilling through 2 sides would be better. Connecting these track links with 0.4mm diameter piano lines ended up with that I had to thin the teeth of the sprocket to fit the tracks on because the tracks was connected too tight. I should have used 0.2 mm instead.........(^^; |
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| Converted a servo to rotate the turret freely.
Ususlly servo can only turn 180 degrees. To make it fully rotatable, I cut off the stopper on final gear. Also the final gear has to be freed from potential meter, which is positioned in the center. And don't forget to extend the inner diameter of the gear. Although the rotating speed is a little bit faster, comparing with gearbox type, it does not need so much space. Before putting the gear on servo horn, the inner diameter of which should be extended. |
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| I used a servo with an add-on piano line
to move the barrel from chassis. Same as I made for the Tiger I Initial
Production, I added a weight on breech to push the barrel up. Opposite
by pushing the breech up with the piano line.
Receiver is from Futaba, same like the one used for M5A1. I took out the curcuit boards and installed them into the kit. The amplify for driving forward and backward was from a "455" servo. |
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| The Modelkasten workable tracks
The workable tracks really looks great. Compare with Fruilmodellismo matel tracks used on the M4 Sherman kit, Modelkasten tracks is lighter, which causes smoother movement. The only problem appeared was tracks stuck to sprocket when moving backward. This needs special treatment to fix up, i.e. add oil on both tracks and horns of the sprockets. If running slowly, the Panzer III looks very real. I've never been tired of looking at the "slow movement" The tracks was still working well even I had run the kit for more than 1 hour for taking movies. Upon the outstanding result, I run it on a carpet. The tracks was almost broken immediately....(^^;; |
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| The new type of driving device.
There is still lots of improvement can be done on the device..........(^^; It is a simple way by holding dirving gear down with a spring. This way also gets an unstable speed. |
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| A construction article was also added in "Construction Diary". Please read the article for details.(Click on the graphic on right side) |
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