Quick Pinless Attachments for LEGO EV3 Competition Robots (Part 2)

If you think that the quick pinless attachments shown in video 63 are quick enough, see this tutorial and you will find out that the quick pinless attachments could be even quicker. These attachments can work without motors but by using the inertia forces.

  • #64
  • 07 Dec 2014
  • 8:11

This tutorial shows the logic of creating quick pinless attachments which do not have any moving parts. This facilitates their placement and is the key to the quicker change of attachments on the LEGO Mindstorms robot construction.

There is a short description of how the attachments work; how the inertia forces affect the robot parts and what causes these inertia forces. The tutorial once again focuses on the building process of the quick pinless construction base, the attachment and the adaptor.

Try to use this type of quick pinless attachments and see how many new opportunities it will give you. Share with us your comments and ideas.

Instructions for building the quick attachments for this LEGO robot are given below.

Quick Pinless EV3 Attachment

The attachment shows how to do build a pinless robot attachment with LEGO EV3 Mindstorms

Image for Quick Pinless EV3 Attachment

Second quick pinless attachment

Another example for a quick pinless attachment build with LEGO Mindstorms EV3 robots.

Image for Second quick pinless attachment

EV3 Pinless Attachment Example program for episode 64

The first example program in the episode.

Image for EV3 Pinless Attachment Example program for episode 64


Another type of quick pinless attachment will be shown in this episode. The attachment will use inertia forces instead of motors. You are going to see why some of the robot parts stop moving and some continue when the robot stops.

On this robot you can use the sensor shield to place the quick pinless attachment base. You can make it stick to it with these parts. For example, here and here. For the construction you may need these parts.

Like that.

The same on the other side. And they need to be positioned like that.

You can connect them with that part.

And to make it a little bit durable we will place this part. Now. This is how it sticks to the robot. But it's not very stable. To make it better, you can make these connections - here and here.

Like that and that too. And here is the base.

Now it's much more durable. The attachment that is going to be created will be for the Senior Solutions Chair Challenge Solving. The attachment has to catch the chair in that way and bring it to the base.

For that purpose you may use two fifteen pin hole beams and one thirteen pin hole beam. You may connect them with that element. Like this and here it is.

And this is the attachment. But in that way it is not very safe. The chair may fall off the attachment. Thus, you may construct the same construction.

And connect both elements in that way. You may use this kind of element.

You may leave the last holes for the adaptor between the attachment and the base.

Like that and here. And it's ready. But as you see it isn't stable. To make it a little bit more stable, you may use this element. And now it's much more stable. Up to now, you have the quick pinless attachment base and the attachment. You need to construct the adaptor. For the adaptor you may use these small axles here with that element.

Like that.

After that, you may use this small axle - again like that. And this part - like that.

And one three-unit axle with a cap.

And you have to do the same on the other side.

Like that.

And here it is. That axle here.

And the other one here.

And the cap.

Now everything is ready. But as you can see, it's very difficult for the attachment to fall in that way. You have to speed up the robot a lot. So, you may use this part.

You may attach it here.

So, you can use it to make this construction vertical. Now let's see how it works.

Now - this is what happened. While the robot is moving, all parts are moving with it. The robot stops and the inertia forces come into play. The inertia drives the parts to continue moving forward. The parts that are rigidly connected to the robot also stop. But the upper part of the frame isn't rigidly connected, so it falls. Now you are going to see an example of how quickly we change the attachment. Try to use the same principle in your robots and leave us a comment below. Thank you.