Link Lengths and Simple Reach Calculations

T. Armstrong
U of Michigan Center for Ergonomics
http://www-personal.umich.edu/~tja/
10/12/19

This page provides standing height data1 and average body proportions2 for simple posture and reach calculations.
Units:
FemalesMales
Stature1 1504 1618 1730 1636 1755 1880
Select
Links Fraction2 Length3
1. Stature1 1.000 1504
2. Center-Shoulder 0.129 194
3. Center-Hip 0.096 144
4. Floor-Shoulder 0.818 1230
5. Floor-Hip 0.530 797
6. Shoulder-Elbow 0.188 283
7. Elbow-Wrist 0.145 218
8. Hand-Touch 0.108 162
9. Pinch - 65% Hand 0.070 105
10. Grip - 35% Hand 0.038 57
11. Shoulder-Touch 0.441 663
12. Shoulder-Pinch 0.403 606
13. Shoulder-Grip 0.371 558
Drillis & Contini Link Proportions
Average body link proportions2 based on specified stature. figcaption>

Enter bench dimensions in mm:

Height
x
Depth
x Width

Enter reach location with respect to worker in mm:

Height
x
Fore/aft
x Rt+/Lft-
Enter belly space (use 100 mm default):

Specify hand posture4 & calculate reach5

Reach

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Lifting considerations

1National Health Survey. For latest data see: https://www.cdc.gov/nchs/data/series/sr_11/sr11_252.pd
2from: Drillis, R., Contini, R., & Bluestein, M. (1966). Body segment parameters. New York University, School of Engineering and Science.
3Average link lengths for specified stature
4Gordon C, Churchill,T, Clauser C, Bradtmiller B, McConville J 1989. Anthropometric Survey of U.S. Army Personnel: Summary Statistics, Interim Report for 1988. pp. 190-1, 322-323, 332-333, Technical Report Nubmer ADA209600, http://www.stormingmedia.us/00/0069/A006902.html.
Hand Postures
Hand postures for touch (59), grip (125) or pinch (130). Hand length reduced 35% for pinch & 65% for grip4
5Reach distance* = ((Upper Arm + Forearm + Hand Length**)2-(Shoulder Ht - Bench Ht)2))1/2