3. At a computer manufacturing firm in Notreal, Texas, a conveyor belt delivers
ID: 328116 • Letter: 3
Question
3. At a computer manufacturing firm in Notreal, Texas, a conveyor belt delivers commercial grade desktop CPU towers to a station where they must be lifted off of a "catch" platform at the end of the belt and onto a delivery cart to be taken to a burn-in station. The operative at this station, who can be either male or female, lifts the CPU from the conveyor belt, which is 23 inches off the floor, and places it on the delivery cart, which is then wheeled away and quickly replaced with an empty cart pushed by another employee The top surface of the cart measures 27 inches from the floor. The cart is positioned at 45 degrees to the conveyor catch platform. A new CPU arrives every 10 seconds. Each CPU measures 15 inches high, by 8 inches wide, by 15 inches on the side. The operator grasps the CPU by the front and back bottom edge, hence his/her hands are approximately 15 inches apart. The CPU does not have any handles, but is still not too difficult to pick up. The CPU weighs 20 pounds. The operator at the delivery conveyor works for 2 hours, then is replaced by one of the other workers. The rest of the 8-hour shift is spent doing things other than the inspection and CPU lifting operation. A. Analyze this task using the "one size fits all" method in MIL-STD-1472G to determine if moving the CPUs from the platform to the cart is acceptable or not. Specifically reference the appropriate callouts in MIL-STD-1472G for each max WL adjustment (e.g., "5.8.6.3.X") 5 points) Max Acceptable Weight: (List Table references with your attached work) B. Analyze this material handling task using the NIOSH Lifting Guide. You must report all multiplier values, the final RWL, and the LI, and also state whether changes need to be made (35 points) HM VMdest VMorigin DM AM FM CM RWL LI Are engineering changes required for this material handling task? Why or why not?Explanation / Answer
The material handling task mentioned in this case involves lot ofphysical movement and ergonmics like lifting the CPU weighing 20 pounds from height of 23 inch from conveyor belt ,streching front for graping the CPU etc. The Operator spends only 2hrs at delivery conveyor and rest of the 8hrs shift is spend less productively. Moving the CPU's from cart to platform is unacceptable since it might affect the electronic parts in CPU .The MIL-STD-1472G methodlogy will help to improve the productivity of Notreal,Texas and utilizes the manpower productively in less stress and improving their ergnomics.
MIL-STD-1472G methodlogy
Application. Criteria identified in this standard shall be applied to the design of hardware, software,
systems, equipment, and facilities in which there is a human interface or interaction including operation or
maintenance, training, and support activities.
1.Accommodation. Equipment, systems, and subsystems shall be designed to accommodate the central 90
percent of the anticipated user population.
2.Human engineering requirements. Human engineering design requirements shall be established to
develop effective human interfaces and preclude system characteristics that require extensive cognitive, physical, or
sensory skills; complex manpower or training-intensive tasks; or result in frequent or critical errors.
3)Human engineering activities. Human engineering activities shall be identified and executed according
to a Human Engineering Program Plan or equivalent document (e.g., human factors section of a Human Systems
Integration Plan), to ensure that systems are designed to account for human capabilities and limitations. Specific
human factors analyses and activities are outlined in MIL-STD-46855.
4) Design factors. Design shall reflect human engineering, life support, and biomedical factors that affect
human performance, including, when applicable:
Satisfactory atmospheric conditions including composition, pressure, temperature, and humidity, including
safeguards against uncontrolled variability beyond acceptable limits.
b. Range of acoustic noise, vibration, acceleration, shock, blast, and impact forces and safeguards against
uncontrolled variability beyond safe limits.
c. Protection from thermal, biological, toxicological/chemical, radiological/nuclear, mechanical, electrical,
electromagnetic, pyrotechnic, and other hazards.
d. Adequate space for personnel, their equipment, and free volume for the movements and activities they are
required to perform during operation and maintenance tasks under normal, adverse, and emergency conditions.
e.Efficient arrangement of operation and maintenance workplaces, equipment, controls, and displays.
f.Adequate natural or artificial illumination for the performance of operation, control, training, and
maintenance.
g.Design features to assure rapidity, safety, ease and economy of operation, and maintenance in normal,
adverse, and emergency maintenance environments
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