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Tapulley Prototype

PROTOTYPE Version #1

The image below presents the first trial of the implementation of the 3D design project

PROTOTPE Version #2

Modifying the first prototype

This required to cut the parts once more with some adjustments in the design to solve the problems met while prototyping for the first time.

Problems of the prototype version #1:

1. Some adjustments of dimensions
2. The large gears on the sides that are connected directly to the motor were slightly bent which resulted in unstable rotations of the drums.
3. Torque: The motor should send force from a smaller gear to a larger one in order to lower the motor's speed since i don't need high speed to dispense tape.

Changes:

1. Add a rubber cover on the upper drum to hold tightly the tape while rolling
2. Add a string between the two drums in order to hold them tight together
   

PROTOTYPE Version #3

Because of the torque problem and the friction between the acrylic parts, i needed to modify the design.

Changes:

1. I change the controlling (delivering) gears instead of from a smaller to a larger gear, a larger to a smaller one in order to result in high torque and low speed as desired at the first place.
2. The change in gears resulted in a change in the motor's orientation, so now it is slight rotated as shown in the photo below.

Image A shows the tape holder at the end on the sides of the dispensing machine. This is a technique to keep the area holding the tap flexible when pulling out or inserting the tape into the dispenser.

Image B shows the cutter that cuts off the tape after the motor dispenses the desired part given by the controlling board (developed in the electronic part of the final project)

image A	image B

Creating the tension was one of the challenges I have faced at the beginning. Firstly I thought of creating the tention between the two drums using rubber bands; however, since the two drums are in motion, it is the rubber bands are obviously not the right technique to go with. So one of my colleges at Fab Lab Egypt suggested creating the tension between the drums using a two springs for both sides of the drums as show in the picture below.

Therefore adding four nails, one on each base of each drum, was the perfect hook for the springs.

Files

Main design_mechanical 3D

2D drums & gears

2D body

Electronics Design

Code

 

 

mariamwaelgado@gmail.com

http://mariamwaelgado.wix.com/ mariam-wael