Compound gear train Lab Report 4 PDF

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Summary

The main purpose of the experiment is to calculate the train value using three different methods. The methods are the number of gear teeth, pitch diameter, and the number of input and output turns. Moreover, to calculate the output angular velocity and also to controlled electromechanical counter us...

Description

EMT 1220 D410 LAB REPORT Compound Gear Train

Fahmeda Khanom & Touheda Khanom 03/10 /2020

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Objective The main purpose of the experiment is to calculate the train value using three different methods. The methods are the number of gear teeth, pitch diameter, and the number of input and output turns. Moreover, to calculate the output angular velocity and also to controlled electromechanical counter using cam and limit switch with a gear train.

Equipment and Materials 1. 4 gears or at least two different pitch diameters 2. 2 sets of pillow blocks or two different heights 3. 1 breadboard 4. 4 legs 5. 4 ball bearings 6. 14 socket head screws and washers 7. 1 handwheel 8. 1 screwdriver 9. 1 adjustable carn 10. 1 square 11. 1 volt-ohm meter 12. 1 Electrical terminal strip with wire and electrical plug

Procedure and Schematic 1. First, we used 4 gears to make a two-stage speed reducer with counters. 2. In the lab, the teeth of Gear A is supposed to be much smaller than Gear B, and the teeth of Gear C is much smaller than Gear D. 3. Using the isometric view and the schematic diagram provided by the lab manual, we built the two-stage reducer. 4. Gear B and C were on the same shaft and Gear A and D were on different shafts. 5. We used the pillow blocks to avoid the movements of the gear shafts and used ball bearings sometimes. 6. To find the number of output turns using the input turns provided in the lab manual using the handwheel.

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Schematics:

Data

ANSWER TO QUESTIONS

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1.

2. To find the number of train value by using the number of gear teeth we did the following: T

T

TV = ( T A ) × ( T C ) B

D

60 60 TV =( 90 ) × ( 100 )

TV = 0.4 3. Train value by pitch diameter by: TV = (pitch diameter A / pitch diameter B) * (pitch diameter C / pitch diameter D) = (1.125/1.68)*(1.0625/2.0625) TV = .4 4. The train value results calculated by three different methods were the same. Three different methods can be used to find train value. 5. If a motor rotating at win = 1800 rpm turned the Input Handwheel to find wout we did the following: wout = TV × win

= 0.4 × 1800 = 720 rpm 6. The gear shafts were prevented from sliding was by using the ball bearing by the end of the shafts 7. The Electromechanical counter is used to count the input values and the Mechanical 

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counter is used to find the output value. 8. The Electromechanical counter does depend on the direction of the input handwheel because the EM counter calculates the input. 9.

CONCLUSION In conclusion, in the experiment, we learned how to find out the train value using three different methods such as the number of gear teeth, pitch diameters, and the number of input and output turns. We also find the angular velocity using the omega input multiply 1800 rpm which gives omega output. In the experiment, we used handwheel to find ou the number of input and output turns to find the train value. The Electromechanical counter is used to count the input values and the Mechanical counter is used to find the output value.

INTERNET RESEARCH

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A) Gear Terminology 1 - Involute/Involuntomety: is a curve that is dependent on the shape of another curve. A  gear tooth that is in contact profile to an involute curve, that interacts with other teeth with rolling 2- Cycloid: is the curve moving in a straight line without slipping in a circular wheel. 3 - Hypocycloid: is a plane curve that rolls in larger circles by a fixed point. 4 - Epicycloid: A  n epicycloid is choosing a point on the circumference of a circle. 5 - Epitrochoid: is a roulette rolls around outside of a radius by a fixed point. 6 - Addendum: is the difference or the distance between the gears tooth tip and the reference line. 7 - Dedendum: is the difference or the distance between the gears tooth root and the reference line. 8 - Diametral Pitch: are the teeth of pitch diameter in a gear. 9 - Circular Pitch: is the distance along with the pitch circle 10 - Pressure Angle: is tangent between the tooth face and the gear wheel

B) Equipment 1 - Limit Switch: The limit switches are used to control the circuits and to stop or start the functions of electric motor. 2 - Normally Open (NO) Contact: This allows the current flog through the circuits when the relay is energized.

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3 - Normally Closed (NC) Contact: This allows the current flog through the circuits when the relay is not energized. 4 - Roller Cam and Follower: Cams in mechanism is used to convert an object motion from rotary to linear reciprocating motion. Also, the follower follows the cam rotation in a reciprocating motion. 5 - Cam Detent: Detent prevent the rotation of the cam in the mechanism. 6 - Electromechanical Solenoid: S  olenoid is the coil of wire that converts electrical energy to mechanical energy. It creates linear motion using mechanical energy. 7 - GPS Odometer: is used to measure distance traveled. 8 - Ratchet: is a rotary or linear motion in only one direction preventing the motion in the opposite direction. 9- relay

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