Instructables
Picture of How to use the NIOSH lifting Equation
NIOSH lifting equation helps determine if an object or weight is unsafe to lift over a standard eight hour work day.  There are 10 steps you can take to determine if your lift is safe.

Materials you will need:

-Tape Measure
-Writing Utensil
-Paper
-Calculator
-Scale

Estimated time to complete : 15 minutes


Terminology:

RWL = Recommended Weight Limit
LI = Lifting Index
HM = Horizontal Multiplier
VM = Vertical Multiplier
DM = Distance Multiplier
AM = Asymmetry Multiplier
CM = Coupling Multiplier
FM = Frequency Multiplier
 
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Step 1: NIOSH Requirements

Watch the video to determine if the NIOSH lifting equation is applicable in your situation.

Step 2: Horizontal Multiplier

Picture of Horizontal Multiplier
Asymmetry.jpg
Measure, in inches, the horizontal distance between the center knuckle of your hands and the center of your body while holding the object at the beginning of your lift.  The center of your body can be found by measuring the midpoint between your ankles, as seen in figure above.  Label and record this measurement as your horizontal multiplier, HM.

Step 3: Vertical Multiplier

Picture of Vertical Multiplier
Measure, in inches, the vertical distance from your hands to the floor at the beginning of your lift.  Label and record this measurement as your vertical multiplier, VM.

Step 4: Distance Multiplier

Picture of Distance Multiplier
Measure, in inches, the vertical distance between your hand position at the beginning and end of your lift.  This can be easily measured taking the absolute value difference between your vertical multiplier and the distance between your hands and the floor at the end of the lift.  Label and record this as your distance multiplier, DM. 

In the example provided above, the absolute values difference is 58 in. - 15 in. = 43 in. = DM.

Step 5: Asymmetry Multiplier

Picture of Asymmetry Multiplier
Measure, in degrees, how far you turn your torso from the direction your feet are facing at the beginning of the lift.  Label and record this your value as your asymmetric multiplier, AM.

Note: Many times lifts do not require turning your torso without moving your feet, if this is the case your measurement is 0°.
manishrkp10 months ago
Hi is it possible to make ready to use table like "BMI Chart"? Thanks