Lesson Plan
Materials
Need materials? Purchase the Barnabas Robot Arm at our e-store.
Classroom sets are also available. Contact us at info@barnabasrobotics.com to inquire.
Lesson Overview
In this lesson, you will assemble the claw motor assembly and attach the two pinchers that open and close the robot arm claw.
Instructions
STEP 1. Build the Claw Motor Assembly
Gather the following parts:
- 1 x Servo Motor
- 4 x Acrylic Pieces
- 4 x M3x10 Screws
.png)
STEP A: Slide the smaller rectangular acrylic piece up from the bottom of the servo motor. Feed the servo wire through the opening as you slide the piece into position. Make sure the piece is oriented as shown in the photo.
STEP B: Insert the smallest acrylic piece down through the top and into its matching slot.
STEP C: Insert the remaining small acrylic piece down through the top and into the larger slot on the opposite side of the servo motor.
STEP D: Place the large acrylic panel over the top of the assembly. Align its slots with the two acrylic pieces installed in Steps B and C, then press the pieces together so everything sits flat and securely in place.
| STEP A | STEP B |
|---|---|
.png) |
.png) |
| STEP C | STEP D |
.png) |
.png) |
STEP E: Check your assembly from the side. The two large acrylic plates should be parallel, with the servo held securely between them as shown in the photo.
| STEP E |
|---|
.png) |
STEPS F & G: Insert the four M3x10 screws through the bottom plate and fasten the two large acrylic plates together. Check both sides of the finished assembly against the photos below.
| STEP F | STEP G |
|---|---|
.png) |
.png) |
STEP 2. Attach the Pinchers
STEP A: Identify the pincher with the extra hole near its base. Position it on the claw assembly as shown in the photo, then fasten it with a screw.
STEP B: Position the second pincher on the opposite side of the claw assembly as shown. Fasten it with a screw.
IMPORTANT: Do not overtighten the pincher screws. Both pinchers need to pivot freely. If a joint is too tight, the servo may not be able to open and close the claw properly.
| STEP A | STEP B |
|---|---|
.jpg) |
.jpg) |
