Constant Natural Frequency Elastomeric Isolators

TECHNICAL REFERENCE
OPTICAL TABLES
BREADBOARDS
AND GRID PLATFORMS
HONEYCOMB, GRANITE
AND RIGID STRUCTURES
ISOLATORS
WORKSTATIONS AND
ISOLATED PLATFORMS
STRUCTURAL RAILS
AND CARRIERS
TESTING, ANALYSIS
AND DESIGN
1056
Optical Tables and Vibration Control
NewDamp ND20 and ND30 Series
These isolators are based on conical elastic elements. They provide almost equal
isolation in vertical and horizontal directions. Within the same design envelope, they
provide stiffer, higher load (ND30-A); and softer, lower load (ND20-A) options. By using
custom profiled upper supports, these isolators can be easily tuned to particular
load/frequency requirements.
Specifications
Dimensions
Model ND20-A
4.50
(114.3)
A
A
4.50
(114.3)
B B
4.30
(109.2)
Model ND30-A
4.50
(114.3)
A
A
A
4.50
(114.3)
B B
A
4.30
(109.2)
CLEARANCE FOR M6
M6 X 1.0 3 PL
A
A
Model (Metric)
ND20-A (M-ND20-A)
CLEARANCE FOR M6
M6 X 1.0 3 PL
2.50
(63.5)
SECTION A-A
2.50
(63.5)
SECTION A-A
3.28
(83.2)
Dimensions [in. (mm)]
Model (Metric) A B
ND20-A (M-ND20-A) 4.00 (100.0) 1.50 (37.5)
ND30-A (M-ND30-A) 4.00 (100.0) 1.50 (37.5)
3.28
(83.2)
Model (Metric)
ND30-A (M-ND30-A)
Load per Isolator [lb (kg)] 45 (20)–250 (115) 70 (30)–300 (135)
Load Range (set of 4) [lb (kg)]
Natural Frequency (Hz)
180 (80)–1000 (460) 280 (120)–1200 (540)
Vertical 9–12 10–15
Horizontal 8–10 9–12
Height, Isolator [in. (cm)] 3.28 (8.3) 3.28 (8.3)
Base Dimension [in. (cm)] 4.5 x 4.5 (11.4) 4.5 x 4.5 (11.4)
Interface Compatability Breadboard, Microlock Breadboard, Microlock
Phone: 1-800-222-6440 • Fax: 1-949-253-1680
ND30-A NewDamp Elastomeric Isolator.
Customized ND20 NewDamp Elastomeric
Isolator.
LOAD (lb)
FREQUENCY (Hz)
200
150
100
50
30
20
10
ND20-A
ND30-A
0 0 0.2 0.4 0.6
DEFLECTION (in.)
ND20-A
ND30-A
0
0 50 100 150 200 250
LOAD (lb)