Snook Tables Course

Using the Snook Tables to evaluate manual material handling tasks.

2. Liberty Mutual MMH “Snook Tables”

3. Links:
Ergonomics Plus Calculator
Bernard’s Adapted Tables

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6. •Vertical Location
•Floor to Knuckle (below 29”)
•Knuckle to Shoulder (29 -54”)
•Above Shoulder (above 54”)
•Frequency
•1 action/8 hours
•1 action/30 minutes
•1 action/5 minutes
•1 action/2 minutes
•1 action/ 1 minute
•1 action/14 seconds
•1 action/9 seconds
•1 action/5 seconds
•Horizontal Distance
•7”
•10”
•15”
•Distance of Lift
•10”
•20”
•30”

7. Task Variables determined by the assessment:
•Vertical Location –floor to knuckle lift (below 29”)
•Frequency -average of 1 lift every 2 minutes
•Horizontal Distance –10” (front of body to mid-line of hands)
•Distance of Lift –30” (lifts from height of 4” to 32”= 28”)
•Weight of Object –35 lbs.

8. Task Variables determined by the assessment:
•Vertical Location –Above Shoulder (above 54”)
•Frequency -1 action every 5 minutes (12 actions/hour)
•Horizontal Distance –10” (front of body to mid-line of hands)
•Distance of Lift –30” (lifts from height of 28” to 60”= 32”)
•Weight of Object –28 lbs.

9. Task Variables determined by the assessment:
•Vertical Location –Knuckle to Shoulder (29 -54”)
•Frequency -1 action every 5 minutes (12 actions/hour)
•Horizontal Distance –15”
•Distance of Lift –20” (lowers from height of 49.5” to 31”= 18.5”)
Weight of Object –25 lbs.

10. Task Variables determined by the assessment:
•Vertical Location –Knuckle to Shoulder (29 -54”)
•Frequency -1 action every 30 minutes (2 actions/hour)
•Horizontal Distance –7”
•Distance of Lift –10”
•Weight of Object –30 lbs.

12. •Carry Point (Vertical Location)
•Waist height (elbows bent)
•Below Waist Height (elbows straight)
•Frequency
•1 action/8 hours
•1 action/30 minutes
•1 action/5 minutes
•1 action/2 minutes
•1 action/ 1 minute
•1 action/20 seconds
•1 action/10 seconds
•Carry Distance
•7’
•14’
•27’

13. Task Variables determined by the assessment:
•Carry Point –Waist Height
•Frequency -1 carry every 2 minutes (30 actions/hour)
•Carry Distance –27’
•Weight of Object = 52 lbs.

14. Task Variables determined by the assessment:
•Carry Point –Waist Height
•Frequency -1 carry every minute
•Carry Distance –27’
•Weight of Object = 40 lbs.

16. •Push/Pull Distance
•7’
•24’
•48’
•97’
•145’
•194’
•Push/Pull Point (Vertical
Location)
•High (hands about 55”)
•Middle (hands about 36”)
•Low (hands about 24”)
•Frequency
•1 action/8 hours
•1 action/30 minutes
•1 action/5 minutes
•1 action/2 minutes
•1 action/1 minute
•1 action/30 seconds
•1 action/15 seconds
•1 action/12 seconds
•1 action/6 seconds
•Force Measurement
•Initial Force
•Sustained Force

19. Task Variables determined by the assessment:
•Pull Point –Middle
•Frequency -1 pull per 5 minutes
•Pull Distance –97’
•Initial Force = 53 lbs.
•Sustained Force = 25 lbs.

20. Task Variables determined by the assessment:
•Pull Point –Low
•Frequency -1 pull per 2 minutes
•Pull Distance –24’
•Initial Force = 75 lbs.
•Sustained Force = 34 lbs.

21. Task Variables determined by the assessment:
•Push Point –Middle
•Frequency -1 pull per 1 minute
•Push Distance –97’
•Initial Force = 24 lbs.
•Sustained Force = 15 lbs.

22. Task Variables determined by the assessment:
•Pull Point –Middle
•Frequency -1 pull per 30 minutes
•Pull Distance –145’
•Initial Force = 35 lbs.
•Sustained Force = 14 lbs.