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Search took 0.01 seconds; generated 65553 minute(s) ago. Search: Posts Made By: SteinHDan
Forum: Construction Equipment 12-15-2015, 03:38 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Thanks, Kevin, Jim and Reg! :-)




I don't think this site support video embedding. What I did above is just to add a screenshot of the embedding in a link to YouTube. I did that because I was...
Forum: Construction Equipment 12-14-2015, 06:22 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

The first test drive of the full working skeleton!


http://d1t2tbzmskak12.cloudfront.net/cat-excavator/skeleton_video_1.jpg
(https://youtu.be/ueaT-cYe8B4)

https://youtu.be/ueaT-cYe8B4

The...
Forum: Construction Equipment 12-14-2015, 05:57 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

On the Raspberry PI I run the below code. I keep it in a file /home/pi/dev/excavator/control.js


To run this program automatically when the Raspberry Pi gets power applied, just add this one line...
Forum: Construction Equipment 12-14-2015, 07:12 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

To program the motor drivers so that they are Pololu Qik compatible (for the commands "GetDeviceId", "SetMotor1Speed" and "SetMotor2Speed"), follow these steps:
1. Connect the USB cable to a PC
...
Forum: Construction Equipment 12-14-2015, 06:30 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Wiring the electronics:

I ended up buying the motor controllers and the Arduinos on Ebay. The Arduinos ar Nhduinos, a Chinese clone that is a bit cheaper than the original Arduino.


Soldering...
Forum: Construction Equipment 12-14-2015, 05:31 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Just a couple of pictures showing the scale VS a 1/14 Bruder man:

http://d1t2tbzmskak12.cloudfront.net/cat-excavator/IMAG0904.jpg

http://d1t2tbzmskak12.cloudfront.net/cat-excavator/IMAG0906.jpg
Forum: Construction Equipment 12-06-2015, 09:46 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Hi, Kevin!

Wow, 50 kg.. that's a heavy machine! :-)

This one is at 30 kg currently, after adding 8 kg lead ballast. It's getting tricky to lift. How do you move yours?

Stein :-)
Forum: Construction Equipment 12-05-2015, 04:18 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I could have used standard ESCs for the gear motors and controlled them using PWM output from the Raspberry like a normal RC receiver.
But for this project I want:
- Programmable current limiting...
Forum: Construction Equipment 12-05-2015, 03:29 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Any USB joystick or gamepad can be used for controls.

I'm using a very accurate gamepad from LogiTech. It also has a tiny receiver, which is good when the space is limited:
- Logitech F710...
Forum: Construction Equipment 12-05-2015, 03:13 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I'm doing most of my work in JavaScript these days. It's a good choice for doing anything, like web pages (all browsers run JavaScript), web server and web services (with node.js) and also robotics...
Forum: Construction Equipment 12-05-2015, 01:03 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I'm adding WiFi because I want to use it for easy programming and for the FPV video link.

It's a good idea to use a very standard WiFi adapter, for example any adapter with a RealTek chipset, like...
Forum: Construction Equipment 12-05-2015, 10:38 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I am using a Raspberry Pi 2 model B as the embedded PC for this project.

The Raspberry Pi will control:
- The ESCs (speed controllers) for the seven gear motors via USB serial ports
-...
Forum: Construction Equipment 12-04-2015, 03:53 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Hi, Fired up!




Thanks!

I saw from another thread that you are planning on building your own, and that you want to use standard parts. That sounds very similar to what I'm trying to do...
Forum: Construction Equipment 12-04-2015, 03:48 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Yes, or four ;-) I think the biggest problem will be too much backlash in the gears. But we'll see.

For the motor shield, you can program any behavior you want. The motor shield just makes...
Forum: Construction Equipment 11-24-2015, 04:49 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Hi Lil Giants!

I love your threads and builds!

Thanks for the link to the Fumotec cylinders. Those look very nice and very suitable for this model.

I'm going to control the force of the...
Forum: Construction Equipment 11-24-2015, 12:06 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Thanks, Thuangs!

I'll upload some videos as soon as I have the excavator running again.

I guess I'll make a hydraulic version too at some point. Do you have any pointers to good cylinders that...
Forum: Construction Equipment 11-23-2015, 05:28 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I've tried to construct a bucket without welding. It looks pretty ok and feels strong even if I've just printed it in ABS for now. I'll mill these parts in 10mm aluminum shortly. But I just had to...
Forum: Construction Equipment 11-23-2015, 05:19 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

The bucket linkage is milled from 12mm aluminum. The gear motor is driving the bucket through these links, so they need to be strong.

The pins are M8 x 80mm pins bought here:
-...
Forum: Construction Equipment 11-23-2015, 05:13 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

The stick consists of these parts:
- Sides in 3mm aluminum
- Hubs in 12mm aluminum
- Gear motor (similar to the previous ones)

http://d1t2tbzmskak12.cloudfront.net/cat-excavator/IMAG0867.jpg...
Forum: Construction Equipment 11-23-2015, 05:06 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Mounting the boom

I'm going to try to use electric gear motors first. If that doesn't work out, I'll make the excavator hydraulic instead.

I'm using some quite powerful gear motors for all of...
Forum: Construction Equipment 11-23-2015, 04:45 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Stepping back a few steps and mounting the new slip ring, adding PTFE protective tubing to the drive motor wires and mounting the angle bars that hold the upper structure in place.

The PTFE teflon...
Forum: Construction Equipment 11-01-2015, 05:21 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

I started work on the upper frame and base:

http://d1t2tbzmskak12.cloudfront.net/cat-excavator/IMAG0808.jpg

All the parts are milled from 6mm 6082 aluminum.

The base is 10 mm less wide on...
Forum: Construction Equipment 10-26-2015, 08:41 AM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Hi Marquez81,


Thanks!

I'm not sure if I understood you correctly, but if you ask if I plan to do the same as this for the rest of the components of the excavator, then the answer is yes....
Forum: Construction Equipment 10-25-2015, 06:05 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Hi Crusher,

Just click on the link and then save to your computer. Then start fusion 360 and select Upload and select the file you downloaded.

To create a drawing from the design, you can do as...
Forum: Construction Equipment 10-24-2015, 07:21 PM
Replies: 164
Views: 142,032
Posted By SteinHDan
Re: 90 ton 1/14 metal excavator scratch build w/embedded PC

Milling the main bevel gear:
- https://youtu.be/_9gfQj9GZf4
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