Spring 2016: 3DoT Spider-Bot Cam Simulation

BY: Andrew Saprid ( manufacturing engineer)

Introduction

The initial design assumed that the CAM movement system would be used. Therefore, research on the CAM system and this CAM simulation were performed.

Requirements

Level 2 system requirement states:

  • The 3DoT David shall use two micro motors for the movement system of the robot.

Table of Contents

CAM movement system model

All parts are assembled and connected with the top base and bottom base. The difficulties of making the CAM simulation included many mating in assembly that crashed the solidworks software many times. To prevent the solidworks software from crashing, mates may have to be suppressed so that resources may not be used as much in the software. A lot of parts will be 3d printed, and may exceed the 6 hour limit.

fullview

Here is the CAM and follower simulation of the 3Dot David model. By moving the CAM connected to the follower, three legs will move up, while the other three legs will move down:

CAM

Looking closely to simulate of the CAM movements system of the Hexbug Spider, steps are broken down to analyze and observe each part. The follower (yellow) is connected to the CAM (orange). By moving the follower, it will rotate just as the CAM rotates. The top femur (blue) is connected to the bottom femur (green).  It’s support (red) will be connected to the bottom base. The bottom femur support (gray) will be connected to the top base.

CAM_SimulationBLogHex bug design parts

Follower, CAM, and CAM cover

The follower (yellow) is connected to the CAM (orange). The CAM cover (purple) holds the CAM and follower in place.

CAM_Follower

Top femur

Top femur (blue) is connected to the joint(gray).

topview

Joint

Joint (gray) is then connected to the bottom femur (green). This will make the joint free to rotate, and the top femur (blue) to go up and down.

joint

Tibia

The tibias (gray) are then connected to the femurs.CAM_SimulationBLog1

Bottom Femur Support and Top Base

The bottom femur support (gray) is the connected to the top base (yellow).

Screen Shot 2016-04-11 at 10.36.29 AM

Bottom Femur Support and Top Base

The bottom femur support (gray) is the connected to the top base (yellow).

Screen Shot 2016-04-11 at 10.38.03 AM

Slot bolt and the slot hole on the top femur

The slot bolt (gray) will restrict the top femur (blue) from going out. When moving the follower, the top femur will move, dependent on the slot hole.

slotconnection slothole

Conclusion: CAM movement system model

All parts are assembled and connected with the top base and bottom base. The difficulties of making the CAM simulation, it included many mating in assembly that crashed the solidworks software many times. To prevent the solidworks software from crashing, mates may have to be suppressed so that resources may not be used as much in the software. A lot of parts will be 3d printed, and may exceed the 6 hour limit.