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I grew up with earthmovers and I have operated excavators for many years. My favorite machine is the hydraulic excavator. However, I changed jobs so I don't operate excavators anymore. Unfortunate, because I still regularly get itchy hands when I see these machines running. Unfortunately, buying a real excavator is not an option for me. Now there are remote controlled excavators for sale that run on model-hydraulics, but they cost a fortune. So there was only one thing to do, build one myself!
 
First i looked on the Internet if there were more people that had this idea. Sure enough, after some searching I found several videos and pictures of working RC excavators that did not cost thousands of dollars.
They were converted excavator models from "Bruder". Yes,  childrens toys, but I must say that these models are very detailed. So i bought one and got to work.


Step 1: How it works

This excavator works with hacked servos, that can spin indefinitely. These servos are connected to wooddrillbit thats running in an aluminum tube, with a steel pin in it which engages in the drill. This makes the turning movement from the servos to a Linair movement for the cylinders.
<p>Great work! Caterpillar color really does the difference. Scale cylinders also give the model that stunning real appearance!</p><p>A question for you: could you please post a picture of the steel pin engaging in the drill? I'm trying some different solutions, but my screw drive experiments tend to get stuck when under load...</p><p>Thank you!</p><p>Fabio</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
<p>At first I thought the excavator was a real one cause of the scale of the setting. My mind is blown. I love it.</p>
A really interesting project, I can see similar techniques being useful for lot's of applications.
Amazing, I have wanted one for years. One big problem is I could never build this.
very cool

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