In this experiment we used: - Web view2. We start by picking up the tools sequentially and assemble...

Introduction:

This is the fifth work study lab report, which will be about Motion Study

(Therbligs Technique). First of all, Motion study is an analysis of the basic hand, arm, and

body movements of workers as they perform work. As we mention, in this lab we use

therbligs technique which include physical elements such as transport, grasp assembly and it

refers to any activity that needs physical hands movements. Also, therbligs include mental

elements such as position, search and select and it refers to any activity that needs to

information process and visual effort rather than physical effort.

The objectives of therbligs analysis are:

Eliminate ineffective therbligs if possible; for example, eliminate the need to search for parts or tools by positioning them in a known & fixed location in the workplace.

Avoid holding objects with hand – Use work holder Combine therbligs – Perform right-hand and left-hand motions simultaneously Simplify overall method re-sequence of therbligs in the cycle Reduce time for a motion, e.g., shorten distance of therbligs such as transport

loadedThis report will conclude the experiment's objective, material used experiment

procedure and result.

The Work:

The objectives of this laboratory experiment are as follows:

To understand and use the therblig analysis technique for hands motion while

manual assembly task and create the present therbligs list of right and lift hands

while perform a simple assembly task.

To learn the various symbols of therbligs that used to analysis the hands motion

activities.

Understand how can make improve in the therbligs symbols in order to improve the

hands motion activities and create the proposed list of therbligs chart for an

improved activities of right and left hands activities.

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In this experiment we used:

Roeder Board Manipulative Aptitude Test: This board is the test that uses to measure

hand, arm, finger dexterity, and speed. The board of the roeder board has four

receptacles for holding washers, rods, caps, and nuts. The performance board also is

comprised of a horizontal T-bar and 40 inserts arranged in a predetermined pattern.

And digital stopwatch also records the time to complete a task

The procedures of the experiment:

Present Method:

1. First of all, we do the Present Method we put the washer, rods, caps, and nuts

randomly in one of the four receptacles of the board.

2. We start by picking up the tools sequentially and assemble it in the spots of the

board, and measure the total time for each assembling cycle.

3. Finally, we analyse each step the worker do while doing the assembling steps to

represented in the present table that will be shown in this report.

Proposed Method:

1. Second, we do the Proposed Method we put the washer, rods, caps, and nuts

arranged in the four receptacles of the board, also we can use the horizontal T-Bar to

put the washer and nuts.

2. We start by picking up the tools sequentially and assemble it in the spots of the

board, and measure the total time for each assembling cycle.

3. Finally, we analyse each step the worker do while doing the assembling steps to

represented in the proposed table that will be shown in this report.

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The Present table

Seq. of activities

Left hand Therbligs Right hand Cumulative Time

1 idle TE reach for an object with empty hand

(rod)2 Idle SH attempt to find an

object using eyes or hand

3 Idle ST choose among several objects in a

group4 Idle G grasp an object by

contacting and closing the fingers

until control has been achived

5 Idle TL move an object with hand and arm

6 Idle P position object in defined location

7 Idle A join two parts

8 Idle RL release control of an object

9 Idle TE reach for an object with empty hand

10

Idle SH attempt to find an object using eyes or

hand (washer)11

Idle G grasp an object by contacting and

closing the fingers until control has been

achived12

Idle TL move an object with hand and arm

13

Idle P position object in defined location

14

Idle RL release control of an object

15

Idle TE reach for an object with empty hand

16


hand(nod)

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Table 1. Present Method 1ل

17

Idle ST choose among several objects in a

group18



achived19


20


21


22


23


hand(cap)24



achived25


26


27

Idle A join two parts

28


29

Idle R resting to overcome fatigue

10:50 seconds

End of cycle (1)1 Idle TE reach for an object

with empty hand (rod)

2 Idle SH attempt to find an object using eyes or

hand3 Idle ST choose among

several objects in a group

4 Idle G grasp an object by contacting and


achived5 Idle TL move an object with

hand and arm6 Idle P position object in

defined location

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10


hand (washer)11



achived12


13


14


15


16


hand(nod)17


group18



achived19


20


21


22


23


hand(cap)24



achived25


26


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27


28


29


10:50+9:62=20.12 seconds










defined location7 Idle A join two parts



10


hand (washer)11



achived12


13


14


15


16


hand(nod)17



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8 contacting and closing the fingers


19


20


21


22


23


hand(cap)24



achived25


26


27


28


29


20.12+ 11:37=31.49 seconds










defined location7 Idle A join two parts


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10


hand (washer)11



achived12


13


14


15


16


hand(nod)17


group18



achived19


20


21


22


23


hand(cap)24



achived25


26


27



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829


11.37+31.49= 42.86

secondsEnd of cycle (4)













10


hand (washer)11



achived12


13


14


15


16


hand(nod)17


group18


closing the fingers

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19


20


21


22


23


hand(cap)24



achived25


26


27


28


29


9.40+42.86=52.26













9 Idle TE reach for an object

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with empty hand10


hand (washer)11



achived12


13


14


15


16


hand(nod)17


group18



achived19


20


21


22


23


hand(cap)24



achived25


26


27


28


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29


12.10+52.26=64.36














10


hand (washer)11



achived12


13


14


15


16


hand(nod)17


group18



achived

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19


20


21


22


23


hand(cap)24



achived25


26


27


28


29


25.24+64.36=89.6














1 Idle SH attempt to find an

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0 object using eyes or hand (washer)

11



achived12


13


14


15


16


hand(nod)17


group18



achived19


20


21


22


23


hand(cap)24



achived25


26


27


28


29


15.52+89.6=105.12

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The Conclusion of present method:

After analysing the present method table of therbligs technique, we measured the

cumulative time for 8 cycles to measure the difference between the present and

proposed method. In the present method the total time = 105.12 seconds.

The Proposed table :

Seq. of activities

Left hand Therbligs Right hand Cumulative Time

1 Idle TE Reach for an object with empty hand. (rod)

2Idle G Grasp an object by

contacting and closing the fingers until control has been achived.(rod)

3 Idle TL Move an object with hand and arm.(rod)

4 Idle P Position object in defined location.(rod)

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Table 2. Proposed Method 1ل

5 Idle RL Release control of an object.(rod)

6Idle TE reach for an object with

empty hand.(Node and washer)

7

Idle G Grasp an object by contacting and closing the fingers until control has been achived.(Node

and washer)

8Idle TL Move an object with

hand and arm.(Node and washer)

9Idle P Position object in

defined location.(Node and washer)

10

Idle A Join two parts.(rod)

11

Idle TE reach for an object with empty hand.(Cap)

12

Idle G Grasp an object by contacting and closing the fingers until control has been achived.(rod)

13

Idle TL Move an object with hand and arm.(Cap)

14

Idle P Position object in defined location..(Cap)

15

Idle A Join two parts.(Cap)

16

Idle R Resting to overcome fatigue. 11:35 Seconds

End of cycle (1)









7


and washer)

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10


11


12


13


14


15


16

Idle R resting to overcome fatigue.

11:35+6:40=17:75

SecondsEnd of cycle (2)









7


and washer)





10


1 Idle TE reach for an object with

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1 empty hand.(Cap)

12


13


14


15


16


17:75+9:02=26:77










7


and washer)





10


11


12


13


14


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15


16


26:77+9:52=36:29










7


and washer)





10


11


12


13


14


15


16


36:29+10:35=46:64



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7


and washer)





10


11


12


13


14


15


16


46:64+8:38=55:02







5 Idle RL Release control of an

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object.(rod)



7


and washer)





10


11


12


13


14


15


16


55:02+10:22=65:24










7


and washer)

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10


11


12


13


14


15


16

Idle R Resting to overcome fatigue.

65:24+8:8=74:04Seconds

End of cycle (8)

The Conclusion of proposed method:

The proposed method is the improvement of what we have done in the present

method, and we can see the difference in the cumulative time in the proposed method,

the total time=74.04 seconds

The Improvement in time between the two methods:

In the present method the total time=105.12

In the proposed method the total time=74.04

The difference = 105.12-74.04=31.08 seconds.

The Conclusion:

In the end, this report introduced Therblig’s Technique, which are the seventeenth basic motion elements. Also in this report we will clarify the procedure of our experiment and what we concluded after applied the motion study and work design. In

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this experiment we have used two different methods each one have different time depends on the procedure of the method. After we tried both methods we’ve know the benefits of motion study such as, eliminate ineffective motions if possible, simplify overall method, reduce time for each motion and to maximize efficiency. We can recognize that in any small or big project in the real life and even in industries and companies it's more useful for us to use motion study to save our time and resources.

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In this experiment we used: - Web view2. We start by picking up the tools sequentially and assemble...

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