Re: CATERPILLAR 390D LME 1:8
 

Amazing and crazy

Re: CATERPILLAR 390D LME 1:8
 

Hello everyone



As promised, there is now a video of the new status. As already described, the excavator has received the following changes:

- Working pressure 60bar optionally 70bar

- One hydraulic pump (IPZ2HR7) instead of 3 pumps

- A new valve block (prototype from Schwab Präzision GmbH)

- New lines and connections



The drive now has two brushless motors instead of brushed motors and an adapted gearbox for a higher speed.



I have to optimize the drive a bit again, I'm not completely satisfied with that. I am now very satisfied with the hydraulics. Really a lot of strength and still potential for more. I also really like the controllability. The valves can be controlled very sensitively and have correspondingly large cross-sections.



Have fun watching.



Greetings Andreas

https://up.picr.de/40899499fi.jpg
https://youtu.be/YuSRnYf4BeY

Re: CATERPILLAR 390D LME 1:8
 

Hello everyone



today I'll introduce you to my new drive system. After the conversion to brushless motors was quite disappointing, I decided to use brushed motors again. In terms of power, my first drive (brushed motors from Servonaut) was very good. Even the steep ramp up to the workbench wasn't a problem.

Now I have brushed motors from Dunker again. Namely the GR63x55 in the 12V version. I built a planetary gear in I = 3 directly on the motor. This is from ZD and runs really very easily and precisely with a very high degree of efficiency. After the planetary gear there is a worm gear with I = 7. On the one hand there is the 90 ° deflection and on the other hand it is self-locking. This means that I can simply park the excavator in any inclined position. After the worm gear, there is a 1: 2 reduction by means of spur gears. Then the wave goes "outside". Then you go to the Turas by means of a large link chain and I: 2.8. Thus the overall ratio is I = 117.6. Thanks to the enormously powerful Dunker motor with a nominal speed of 3000 rpm, the speed is now also suitable.

But what was the biggest point for me for this renewed conversion is the sensitivity of the drive under load. This was not possible with the brushless motors. And it is extremely important to be able to drive off very sensitively, especially on a steep ramp. The controller from Beier Electronics fits perfectly with these 12V brushed motors from Dunker. Approx. 35 to 40A are drawn under high load. The regulator can briefly up to 60A. Another nice side effect is that the controller hardly heats up and does not make any annoying noises like the brushless controller.

What was certainly very unfavorable for controlling the brushless motors is the electrical rotary feedthrough. Due to the long supply lines and the additional contact point at the rotary feedthrough, the controller cannot accurately determine the correct position of the motor and thus cannot optimally control the rotary field. This is completely irrelevant with the brushed motors.

So much for the background. Of course, I also made a new video. Have fun watching.

https://up.picr.de/41310337cf.jpg
https://youtu.be/F8R2Vs81bI8

Re: CATERPILLAR 390D LME 1:8
 

Hello at all,

it was a very beautiful day outside with my RC CAT390D. Enjoy watching.


https://up.picr.de/41456752lv.jpg


https://youtu.be/p6X0cGMo0vo

Re: CATERPILLAR 390D LME 1:8
 

Hello,

here is part 2 of the outdoor session.

https://up.picr.de/41594173ti.jpg

https://youtu.be/w7puE42MYPk

Re: CATERPILLAR 390D LME 1:8
 

Hello,

here is the third part of the outdoor action.

https://up.picr.de/41885047ms.jpg

https://youtu.be/e2mT-ohnHx0

Re: CATERPILLAR 390D LME 1:8
 

Hello,
here is another part of the outdoor use with empty batteries...

https://up.picr.de/42264964hc.jpg

https://youtu.be/NXiHXhmQTWM

Re: CATERPILLAR 390D LME 1:8
 

Awesome talent! Funny....I was reading the thread and wondering where this project is happening. Then I saw the package of laser cut cab parts....Cutworks.com. I went there.....German. Of course, I should have known!

Challenge: make a small diesel engine to drive a generator to run your machine. Then we'll see some sweet smelling diesel exhaust running up that nice smoke stack!

You can do it!

Re: CATERPILLAR 390D LME 1:8
 

Andreas,

Where did you learn and practice such awesome design and fabrication skills? You are truly a craftsman and I would say even more of craftsman than your apparent age would allow! Very impressive work.

I have not watched your videos yet, but they are on my list. Awesome creation!

-Ben

Re: CATERPILLAR 390D LME 1:8
 

Hello Ben,

thank you for your nice comments. A small diesel engine is not possible because of not enough space and they have not engough torque at low rpm. But for smoke there are moduls availible, which will make it.
Before I studied mechanical engineer I have made an education for truck mechanic. But the most I have learned by doing.

Andreas

Re: CATERPILLAR 390D LME 1:8
 

Hello everyone

the CAT was now allowed to load a wheelbarrow. A foretaste of my new project, which I've been working on for about 1.5 years ...

https://up.picr.de/42615638hv.jpg
https://youtu.be/IOGZIKXef5E

Re: CATERPILLAR 390D LME 1:8
 

https://up.picr.de/44922363vm.jpg


https://youtu.be/i4deTUKeNAg