Whiteboard Eraser Mechanism: Northern India Engineering College, New Delhi

WHITEBOARD ERASER MECHANISM Northern India Engineering College, New Delhi. Project guide – Ms Alka sharma Mechanical & Automation Engineering Department

PRESENTED BY: • • • • • •

AMIT KUMAR DEEPANSHU JATIN KUMAR NAVNEET KUMAR RUPESH KUMAR RAHUL RATAN

(08115603612) (09315603612) (11115603612) (11615603612) (11715603612) (11315603612)

PROJECT OBJECTIVE •

To reduce the work and time required to erase the blackboard so as to ease the problems of teachers as well as students.

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The idea behind the project basically is to reduce possibility of health hazard .

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Chalk dust or the marker ink may prove hazardous to health to both the teacher as well as student. So to reduce such problems motorized whiteboard dusters are one of the alternatives.

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To save time in long hour lectures.

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It makes tedious work more easy .

FEATURES OF PROJECT • Advantages: – Horizontal & vertical cleaning action. – Contact between duster & board can be adjust. – Cleaning can be done in both directions. – Its construction is simple and requires less maintenance.

• Disadvantages: – No universal size – Requires electricity

PROJECTS PARTS THE AUTOMATED WHITEBOARD ERASER IS DIVIDED INTO BASIC PARTS:

linear guide It allows duster assembly to move along its path during cleaning action & provide mechanical support too. • linear guide length = 1 m • Linear guide dia = 12 mm

linear bearing

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A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction. There are many different types of linear motion bearings. Internal diameter = 12mm

• Pillow block bearing A pillow block, also known as a plummer block or bearing housing, is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories. • INTERNAL DIAMETER – 10MM

BALL SCREW A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which act as a precision screw.

• material • length

= stainless steel

= 1m • diameter = 12 mm

BALL SCREW NUT The circulating balls travel inside the screw and nut thread.

• diameter = 12 mm material = stainless steel

DC MOTOR • A DC motor is any of a class of electrical machines that converts direct current electrical power into mechanical power. The most common types rely on the forces produced by magnetic fields.

• Rpm = 1000 • volt = 12v

THREE WAY TOGGLE SWITCH • We using 3 way toggle switch to get forward and backward motion • Specifications = 2A 250V

END SUPPORTS • End supports support the linear guide rail and also stop the linear bearing • Material = stainless steel • Internal diameter (Bore) = 12mm

JAW COUPLING • A jaw coupling is a type of general purpose power transmission coupling that also can be used in motion control applications.

DUSTER ARRANGEMENT • The cotton wick is attached with two aluiminum strips which attached together through screw nut and linear bearing . • We can adjust the pressure of our duster as per our wish

CAD DESIGN WHITE BOARD

LINEAR BEARING

GUIDE RAIL

END SUPPORTS

LINEAR RAIL ASSEMBELY

BALL SCREW

DC MOTOR 1000 RPM

Calculations 

Dimensions of white board Height = 60 cm Width = 90 cm Border on each side = 2 cm

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Dimensions of Duster/Eraser Height of Duster = 56 cm Width of Duster = 4 cm

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Area of duster/eraser touching the whiteboard (a) a = 56 cm * 4 cm = 224 sq. Centimetres = 0.0224 sq. Metres

 Selection of Motor Let us assume minimum pressure (p) required to clean the board = 1200 Pa Normal Reaction = p * a = 1200 * 0.0224 = 26.88 N Let µ = coefficient of friction (between the duster and whiteboard surface) = 0.5 Therefore, force required to pull the slider is given as: F = µ * Normal Reaction = 0.5 * 26.88 = 13.44 N Erase cycle of duster is 10 sec

FABRICATION OF AUTOMATED WHITEBOARD ERASER Stage 1: firstly we created cad design on solid works Stage 2: secondly we did market survey of each and every component and find the best alternative of our project to make it economic as much as possible. Stage 3: All parts or components were categorized according to their functions and sequences. •

Here some parts were identified as standard components and the other parts could be fabricated on the lab.

Stage 4: When all parts were ready, assembly process was done by referring the assembly drawing. Stage 5: The testing process on the overall system was done to ensure whether the system properly functioning or not.

WORKING MECHANISM The whiteboard will be attached on an oversized wooden board. A customized duster of appropriate length will slide in a specific path. Path for duster will be follow by guide rails. The movement of duster will be achieved by ball screw driven by dc motor. Toggle switch will help in controlling the direction of cleaning.

Result & conclusion • Automatic blackboard erasing mechanisms have been examined.

• It reduces the problem of health issues and time limitations in the learning halls. • It reduce manual hardwork of erasing white board • It make class advance or smart

Future scope • In these project , there is great scope to modify it in different ways like 1. For better finishing we can adopt a spray of water when ever required. 2. By using wireless remote we can reduce effort and it can be more convenient 3. This Project can be further modified into a gesture controlled eraser by using camera and DSP processors so as to identify the position or changing location of the users hand and make the duster do so that more better result can be obtained.