A motorized Lego Crawler Grabber, featured drives with bogie suspension, auto tilting claw and raising and extending boom.
The aim of this creation was to have a playing vehicle using the crawler tracks. I have been inspired by the 8062 grabber. This model featured featured drives, auto tilting claw and raising and extending boom.
The drive is operated by two XL motors, which drives a 12t/36t gearing, ensuring good speed and torque. The crawler tracks are equipped with double bogie with spring, ensuring a good absorbing of raw surface.
The main playalable component is the boom. It cans be raised by two linear actuators powered by a M motor. Then, it can be extended by a M motor located on the bottom with a rack pinion gearing. Note that this function is equipped with a linear clutch composed of two axle joiner connected with a small tube n°75 ensuring the clutching system.
The claw is powered by a M motor inside it, which drives a worm screw gearing with rubber band ensuring the clutching mechanism. But the claw is also equipped with a auto-tilting system, which makes always the claw to be in the same orientation. I have use for that a system of fixed gearing inside the boom. When the boom is raised, the fixed gear gives rotation to the main axle, which give also rotation to the claw, ensuring the orientation. Then, as the boom can be extended, I have use the new 8 tooth gear with no friction and long sliding 16L-axle. The result is that the model doesn’t need a adjustable claw orientation, its remains always horizontal.
As the result, the model is very playable, the functions are good and work fine. The clutch is a good thing to prevent damage. Also it can raise object at high point and make some offroad using the powerful track and bogie suspension. The main power is given by the Lipo batterie, but a standard one can be mounted also.
See it in action :
Thorsten Spletz has made beautiful instructions based on photo sequence I have taken. Therefore, there are two building instructions available : a sold one, for 10€, in order to support my work with professional looking and an other for free as a photo sequence. Both has a bill of material.
Here is the bill of material :
You can buy the instructions with the following button for 10€.
After your payment, you will be redirected to a page for downloading your instructions, and will receive also the link to download by email. Please check the spam box and be patient to receive it. If you have trouble to download your copy of the PDF after payment or open the document, do not make a paypal dispute, please contact me using the contact form. The link to download the instructions expires within 24h. Contact me if you have lost your instructions. Note that you can print it, but not copy or distribute. Thank you for supporting my work 🙂
Free Photo Sequence
You can download it as a ZIP file of 32mo, or by browsing the blog :