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Workstation Design

Fall 2020

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Overview

The adjustable workstation was the final design project for the Design of Planar Machinery class (ME 130) at UC Berkeley. The main focus of this project was to use our knowledge about mechanisms and linkages learned in class. 

About the Adjustable Workstation

The adjustable workstation aims to address many problems in our society. The pandemic was one of the main incentives for this project since many people are working from home. The need for an office space at home has grown tremendously and many people are investing into their home workspaces and looking for products that will meet their work needs. In addition to having something comfortable, we wanted to design a table that is accessible and safe for a wide range of users like people with disabilities or limited motion. Therefore, the workstation is equipped with two different motion mechanisms, one of which is a linear actuator that allows the user to adjust the height of the table and another tilting mechanism that allows the table to go to an angle of up to 20 degrees. These two mechanisms would allow the customer to have a more comfortable experience while working for long hours. An additional core component to the design is a hidden, mechanism driven, storage compartment and a shelving unit where the top shelf can be brought down for easier reach. If the shelf is placed on the wall behind a desk, then after the shelf is brought down, it can slide forward to make sure the user can access the items on it.
For this project, I was in charge of the Tilting Mechanism and the general design of the table such as the Stationary Portion and the aesthetics.
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Moving Portion
Stationary Portion
The Table

Specifications For The Table Motion

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The Tilting Mechanism

The tilting mechanism is constituted by a 4-bar mechanism that includes a slider to be able to push and pull the table in a desired angle. An angle of 20 degrees is set to be the minimum the table can rotate. The main assembly, shown below, is connected to a DC motor. In the future, the DC motor will be replaced by a stepper motor for angle accuracy. 
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The Tilting Mechanism - Components
Using a grashof-slider mechanism used in class and using SOLIDWORKS, it is possible to obtain the link lengths shown below.
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Grashof-slider mechanism for tilting mechanism

The Tilting Mechanism - Computer Motion Analysis

Angular Velocity & Angular Displacement:

Using the Motion Study feature in SOLIDWORKS, it was possible to obtain the angular displacement and angular velocity. As shown below, the minimum angular displacement presented in the bar connected to the table is going to be about 50 degrees and the maximum is 80 degrees, this aligns with the required minimum angular. In addition, the angular velocity that needs to be given to this link to be able to push and pull the table in the desired angle.
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Angular displacement vs time of link connected to table
In addition, the angular velocity that needs to be given to this link to be able to push and pull the table in the desired angle.
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Angular velocity vs time of link connected to table

The Tilting Mechanism - Safety & Improvement

The linear actuator has the internal limit switches placed at the end of the stroke. As a result, the motor will automatically shut off when the screw touches these switches. In addition, the tilting mechanism has a distance sensor to lock the mechanism if the customer wants to increase the angle of rotation greater than the specified one. This mechanism also has a security compartment in which the client will not be able to manipulate the mechanism at all. 

The Tilting Mechanism - Final Result

Tilting Mechanism
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Tilting Mechanism - Front View

Adjustable Workstation - Final Result

Adjustable Workstation - Final Presentation

The Team

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An Phan
Caitlyn Lee
Jonathan de Laine
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Sara Mirza
Natalia Perez
Rudy Snovel
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