Vestil LM-Boom User Manual
Page 10
LM-series fork-mountable booms
01/11
rev. 11/14/2013
Page 10 of 28
Copyright 2013 Vestil Manufacturing Corp.
The center of gravity has a vertical component as well as a horizontal component. The vertical center of
gravity is located 13 in. (~33 cm) above the bottom edges of the fork pockets. The horizontal component
ranges from 28 inches to 47 inches measured from the outer edges of the fork pockets. As shown in the
diagram above:
Retracted horizontal center of gravity (RHCG): boom fully retracted with a load attached at position A,
the center of gravity is located 28 inches (~71 cm) from the outer edges of the fork pockets;
Extended horizontal center of gravity (EHCG): fully extended with a load attached at position J, the
center of gravity is located 41-1/2 inches (~105 cm) from the outer edges of the fork pockets.
All other combinations (of boom extension and load position) yield horizontal centers of gravity located
at or between RHCG and EHCG.
FIG. 2B: LM-OBT- 4k, 6k & 8k Centers of Gravity and Maximum Load Ratings for Varying
Load Attachment Point and Boom Extension Combinations
EHCG
VCG
RHCG
Model EHCG
RHCG
VCG
LM-OBT-4k 47
1
/
8
in. (~120cm)
31
13
/
16
in. (~81cm) 14
3
/
8
in. (~36 ½ cm)
LM-OBT-6k 44
3
/
16
in. (~112cm) 31 in. (~79cm)
14
3
/
8
in. (~36 ½ cm)
LM-OBT-8k 51
11
/
16
in. (~131cm) 35 in. (~89cm)
15 ¼ in. (~39cm)
LM-OBT-4k
LM-OBT-6k
LM-OBT-8k
= Center of gravity
Range of possible
centers of gravity
Origin point
for centers of
gravity