Job Analysis of a Laser Cell Operator

7/28/2019 Job Analysis of a Laser Cell Operator

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Job Analysis of Laser Cell Operator

KIN 420: Occupational Biomechanics

Group #5

Brandyn McCarthy, Jake Tennant,

Jonathan Park, Inhan Song, Michael Wulff


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Laser Cell Operator

Retrieve raw materials from the steel bins.

Load and unload the tooling with raw material.

Use hand held grinder to rid of burs from cuts.

Rack the parts into steel bins.

Introduction


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Risk Factors

Retrieve and place the JK Uppers.

Load and Unload the JK Uppers.

Grinder posture and design.


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Tasks 1 & 4 (retrieve/load bins)

Risk factors:

- Extreme torso flexion

- Extended reach


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Methods of Assessmento 3DSSPP, NIOSH, RULA, Energy Expenditure

Results/Discussiono 3DSSPP:

L4/L5 ~3,000N < 3400N

sufficient strength: 26 - 67% population

o NIOSH: 0.68

o RULA: score = 6

o Energy: 3.68 Kcal/min < 5 Kcal/min


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Recommendations/Implementation

o rotating platform, self-adjusting height


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Recommendations/Implementation

o rotating platform ($2,000 each)

rotate 360 degrees & adjust height

L4/L4 to 1921 N*, RULA to 3 , % capable to ~90*

o change step to ramp ($100 - $200)

energy expenditure from 3.68 to 3.56 Kcal/min

step tripping hazard

*for 50th percentile female


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Tasks 2 & 3 (Load/Unload Tooling)

Video of task: Major Concerns:

Horizontal Hand Location = 65cm

Vertical Hand

Location = 150cm

Hand Load = 4kg


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Analysis Tools:

RULA: 6 - Investigation & changes soon

3DSSPP - 67% females capable

NIOSH (Loading):

o Beginning: RWL = 15.35 kg & LI = 0.26

o End: RWL = 5.87 kg & LI = 0.68

o Actual part weight = 4kg


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Recommendations:

Engineering Controls:

o

Modify tooling to rotate lower & closer ($$$$)o Removeable ramp to tooling (20cm) ($100-200)

Female % Capable increases 67 - 81%

RULA decreases 6 - 3

NIOSH changes 0.68

0.48

Administrative Controls:

o Job Rotation


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Task 5

Major Concerns:

- Ulnar Deviation

- 'Poor' Hand Tool Design

- Right handed-tool

Video:


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Task 5

Analysis Tools

- RULA

- CCOHS Guidelines


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Task 5


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Characteristic of

Hand ToolCCOHS Guideline

Dimensions of

Grinder Hand

Potential Hazard

(Y/N)

Tool shape Slightly contoured Slightly contoured N

Direction of force is

in-line with forearmand wrist (typically

horizontal)

Bent handle Pistol grip N

Handle length> 100 mm (ideally

115 - 120 mm)140 mm N

Handle diameter

(power grip) 30 - 45 mm 35 mm N

Material and texture

of handles

Non-slip, non-

conductive materials

Metallic, Fairly

Smooth SurfaceY

Tool weight (< 1 kg) One handle 1 kg, One handle N

Power Tool Trigger

(Length) 5 cm 5 cm N


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Task 5

Recommendations:New Grinder ($70-155$)- Compressible Handle Material

- Angulation of Tool Head

- Trigger Re-location

- "Bend" the tool


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Summary

Task Problem Solution CostTasks 1&4 Excessive Trunk

Flexion and Upper

Limb Posture

Inefficient EnergyExpenditure

4 Rotating Platforms

Ramp

$8,000 ~

$8,400

$100 - $200

Tasks 2&3 90 Shoulder Flexion Removable Riser

Job Rotation

$35 ~ 100

$0

Task 5 Grinder Design New Grinder- Compressive Handle Material- Angulation of Tool Head

- Changing Trigger Location

$70 ~ 155

Job Analysis of a Laser Cell Operator

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