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SEMI S8-0705 © SEMI 1995, 2005 21 Table A2-2 Two Hand Lift/ Low er Manual Material Handling A nalysis Documentation NIOSH Analysis Horizontal (origin) Horizontal (destination) Vertical Distance Asymmetry (origin) Asymmet…

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SEMI S8-0705 © SEMI 1995, 2005 20
Table A2-1 Criteria to Determine Appropriate MH Analysis Tool(s)
MH Type “If” Condition NIOSH (1991) Bio
Model
Psycho
Physical
2 Hand Lift or Lower F < 1 lift/5 minutes

F > 1 lift/5 minutes
F > 9 lifts/minute
Twisting Occurs
(3D)
Handle Design is an Issue
Limited Headroom During Lift
Work Duration > 8 hours
Load Placement Clearance is an Issue
Load Asymmetry is an Issue
(3D)
Length of Object Measured in Frontal Plane of
Body > 26"
(3D)
Exposure to Heat Stress
1 Hand Lifts Posture = Standing
Posture = Kneeling or Seated
1 or 2 Hand Carry NOTE: Carry is Operationally Defined as
Horizontal Movement of Load >
7 feet
1 or 2 Hand Push/Pull Distance < 7 feet and F < 1 Push/Pull/5 minutes
Distance > 7 feet and F > 1 Push/Pull/5 minutes
Push/Pull Task Requires Significant Sustained
Forces (e.g., slide box along floor)
Lift/Lower in Non-
Standard Postures
Kneeling, Sitting, or Lying
#1
Under Bio Model, 3D indicates that only a 3-dimensional biomechanical model is appropriate for the task condition.
SEMI S8-0705 © SEMI 1995, 2005 21
Table A2-2 Two Hand Lift/Lower Manual Material Handling Analysis Documentation
NIOSH Analysis
Horizontal
(origin)
Horizontal
(destination)
Vertical Distance Asymmetry
(origin)
Asymmetry
(destination)
Frequency Duration Coupling
measure measure measure measure measure measure measure measure measure
multiplier multiplier multiplier multiplier multiplier multiplier multiplier multiplier multiplier
Precision
placement
req.
Recom-
mended
weight limit
Lifting index
Psychophysical Analysis
Box size Range of
lift
Frequency MAWL
Headroom
limitation
Load
clearance
Load
asymmetry
Asymmetry Work
duration
Coupling Adjusted
MAWL
Lifting
index
measure measure measure measure measure measure
multiplier multiplier multiplier multiplier multiplier multiplier
Conclusions
one person lift Recommended
weight limit
Lifting index two person lift Recommended
weight limit
Lifting index
SEMI S8-0705 © SEMI 1995, 2005 22
APPENDIX 3
HANDLE DESIGN DIAGRAMS
NOTICE: The material in this appendix is an official part of SEMI S8 and was approved by full letter ballot
procedures by the North American Regional Standards Committee.
A3-1 Handle Design
A3-1.1 The following diagrams are intended to clarify the criteria described in §6 of Appendix 1.
A3-1.1.1 Cylindrical Handle
Figure A3-1
Cylindrical Handle
D - Handle diameter
L - Handle length
A3-1.1.2 Circular Handle, or Triangular Handle
Figure A3-2
Circular Handle, or Triangular Handle
D - Handle diameter
H - Handle height (thickness)
A3-1.1.3 Pliers Handle
Figure A3-3
Pliers Handle
L - Handle length
S - Handle grip span