A motorized Lego Crawler Grabber, featured drives with bogie suspension, auto tilting claw and raising and extending boom.
How to build ?
You only need the parts and the instructions. You can purchase the PDF instructions on this shop which contains the partlist at the end, but you can check on Rebrickable.
Crawler Grabber
If you do not have the parts, you can purchase the complete kit from retailers :
- Using Genuine LEGO Parts : Have a look to my creator page on Buildamoc or if not available, request a custom quote from them.
- Using non-Genuine LEGO Parts : This model is available on LesDiy Store in a complete package, including parts (alternative bricks from China) and PDF Instructions.
The build
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 :
Building Instructions
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 :
How to build ?
You only need the parts and the instructions. You can purchase the PDF instructions on this shop which contains the partlist at the end, but you can check on Rebrickable or in the instructions preview below.
If you do not have the parts, you can purchase the complete kit from retailers :
- Using Genuine LEGO Parts : Have a look to my creator page on Buildamoc or if not available, request a custom quote from them.
- Using non-Genuine LEGO Parts : This model is available on LesDiy Store in a complete package, including parts (alternative bricks from China) and PDF Instructions.
You can add a Hose 3mm and remove a 2L axle (page 76) on the instructions partlist if you want to have a friction clutch on boom extension as on the video.
Pro-Instructions
You can buy the instructions for 10€ on rebrickable. You can also buy other building instructions and get an automated discount. You will get 15% off for 2 PDF, and 20% off for 3 PDF on the total), available for all the instructions for sale on nico71.fr.
See it on the shop :
Crawler Grabber
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 🙂
Here is some preview of the building instructions :
Free Photo Sequence
You can download it as a ZIP file of 32mo, or by browsing the blog :
(7) Comments
Hello, sorry for that, all I have is on this page.
Hey I’m sorry but I need better explaining like I need more directions and this is amazing
Awesome little model, I like everything about it, the positioning of the motors, the tracks, the boom extension system, it’s simply an awesome model
very thanks nico, I looked for ways to put the tracks on but no luck, now I can put they on 🙂
and with a bit of effort using the small tracklinks
That’s sooooo cool!!!!!
Toujours d’excellents modèles. Je viens d’acheter le plan!
Ace
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