In the previous episode, we made the master robot which has 8 potentiometers.
We printed out all of parts, assembled and successfully tested. The robot sends its angle value over the wireless signal through HC-12 module.
We are going to make this slave robot which parts are 3d printed. The robot has 11 motors including the head motor and 2 motors for legs. But in this episode, we use only 8 motors. Since we already made most of them, all we have to do is just printing parts and assembling them together. Let’s get started!
Step 1: IMPORTANT LINK
Step 2: 3d Printing
I designed all of 3d files and uploaded them on Thingiverse. Download the files and print them one by one.
Step 3: A Set of Motor
These white parts are for making a group of two motors. we are going to make 8 modules.
they look all same but they are not. 4 parts are mirrored against others. they are used depending on the location of each joint. If you follow this video carefully, you can easily make it.
they are used depending on the location of each joint. If you follow this video carefully, you can easily make it.
the parts we are looking at are for the body.
Step 4: Shoulder
we are going to make shoulder frames. when inserting the motor into the frame, the most important thing is to insert it at the mid-point. as you can see, I turned it to the left and right. Tested and plugged it at around middle. We don’t need to be perfect because we can adjust them to some extent later.
Step 5: Replace the Back Cover
Usually, such a small servo motor has only one axis of rotation. In order to build a humanoid robot, it must be mechanically supported on both sides of the motor. Otherwise, it cannot stand its weight. The white parts are for supporting the other side by using a bolt.
Step 6: Elbows
Now, we are going to make elbows. In this way(YouTube video), I found the middle of the motor. The horn is slightly long so I cut the end slightly. please Wear safety glasses when cutting using a nipper
When fixing the opposite side of the motor drive shaft, do not turn it all the way. Just fix it slightly. Normally, bearings are supposed to be here but this kind of small size robot is enough with this technique. The elbow motors also need modification. Attach the cover.
Step 7: Elbows
The elbow motors also need modification. Attach the cover. we need two motors modified. Assemble 2 elbows. The left arm and right arm are different. Please check the YouTube video carefully. Hand frame may be changed later. The look of the robot can be changed depending on the shape of the hand
Step 8: Arms
Assemble all of the arms. Make sure to connect the frame on the midpoint of the motors.
Step 9: Body
All we have to do is to assemble the body . First, assemble the head motor in the center. we are not going to operate the head motor but we need to assemble it for the following episode.
Step 10: Body
Assemble the right arm and left arm on the top frame where the head motor is assembled.
Step 11: Finishing
Assemble the bottom frame and front frame
Step 12: Head
I am going to put the head. Head frame design maybe changed later. considering the functional aspect of the robot, the head has no function. After long consideration, I finally decided to put an extra motor for the head. because this robot is not for functional but for emotional
Step 13: Temporary Supporter
I am going to make a frame to temporarily hold the body. I also ate Pringles again. Use a hot melt glue to connect the lid to the body.
Step 14: Cables
Make a hole on the lid. The cable will pass through the hole. Connect the cables to the board one by one like picture and video. If you don’t understand this board, please refer to previous episodes. The usb cable and power cable also pass through the hole and connected to the board
Step 15: Isolation Tape
Finish the board with an isolation tape. As mentioned in the previous episode, The Pringles bottom is made of aluminum. I cut the plastic and put it into the bin to prevent the circuit.
Step 16: DONE!
Almost done. Turn on the power and try the test. in order to adjust the angle, re assemble the potentiometers of the master robot.
Now we are able to make a remotely controllable robot with eight motors.
Let's recall from the beginning. we made 1 servo move with 1 potentiometer. we made 8 servos move with 8 potentiometers. we also remotely controlled them, we made a master robot and slave robot. I think we are pretty cool. In the next episode, we will make leg for the robot. If you have any question, feel free to let me know in the comment section below. Thank you very much.
Runner Up in the
Make it Move Contest