Damped Optical Post, Gear Rack, Mounting Base, 14 in. Height, 1.5 in. Diameter

The 75 Damped Rod is the most sophisticated rod available for critical applications where acoustical and vibrational forces are a concern. These rods incorporate cylindrical masses constrained by damping layers, concentrated in the upper portion of the rod where they are most effective in dissipating vibrational energy. This construction is the result of extensive computer modeling, dynamic testing and structural analysis. Newport's patented internal damping system provides unmatched vibrational immunity. Compared to the best alternative designs, Newport damped rods exhibit 60% higher resonant frequency, 100% faster vibration decay and 160% better peak compliance. These 14.0 in. (355.6 mm) long rods mount to tables and breadboards with four bolts through a special ring base and have with a nylon gear rack set into the rod for rack-and-pinion control over component elevation.

1.5 inch Diameter Steel Tubing Construction

Newport optical support rods are made of 1.5 in.(38.1 mm) diameter steel tubing, whose material properties allow for greater dynamic rigidity than aluminum designs, as well as thermal stability. The optical support rods are made round to < 1/1000 of an in. (12 µm) for precise, reproducible mating of rod-mounted components. The matte finish of the rods provides a low-reflectivity surface that is resistant to gouging, scratching and corrosion. The hollow-core construction provides even the standard (undamped) support rods with lower vibration amplitudes and higher resonant frequencies, often preferred for sensitive optical systems. The inherently greater stiffness and strength of these steel rods provides its support for larger and heavier optical components.

Damped Rods

Time response of Model 45 Damped Rod supporting a 2.5 lb (1.1 kg) load.

Model 45 and 75 Damped Optical Support Rods are a sophisticated upgrade to the standard supports available in this series, designed for measurements sensitive to acoustic or similar vibrational forces. These rods feature cylindrical masses constrained by damping layers in the upper portions of the rod, located for the most effective dissipation of vibrational energy based on precise computer modeling and testing. Newport’s patented internal damping system provides the utmost vibrational immunity from the environment. Compared to the best alternative designs, Newport damped optical support rods exhibit 60% higher resonant frequency, 5X faster vibration decay and 160% better peak compliance. Both models are 14 in. (356 mm) in length and mount to tables and breadboards securely with four bolts. Model 75 has a nylon gear rack for rack-and-pinion control of mounted elements' elevation. The time-domain responses shown in the figure compare these rods with model 40, the standard steel rod in this family, with the same load at 240 Hz, corresponding to the first bending mode of a cantilevered beam.

Convenient Table Mounting

All optical support rods attach easily to tables either with an integral tie-down bolt or a steel ring base. We offer a wide selection of precision components including clamps, platforms and optics holders that mount interchangeably on the rods for complete component mounting flexibility.

Accessories for a Variety of Applications

Newport has designed several accessories that securely mount onto 1.5 in. rods to support and enhance a variety of applications. Optical support platforms are available to provide stable mounting surfaces for optical components at any orientation, angle and height on the post. Our Quick Disconnect Optical Rod Clamps allow components to be detached and attached quickly and easily, which is beneficial when changing or experimenting with different setups. The 625-RC Kinematic Mirror Mounts enable precise beam positioning for 2, 4, and 6 in. diameter mirrors, with either 100-TPI adjustment screws or micrometers for an orthogonal 10° angular adjustment range.

Specifications

Technical Specs

Type
Optical Support Post w/ Base
Height
355.6 mm
Thread Type
7.4 mm CLR
Material
Steel
Diameter
38.1 mm

Diameter Tolerance
0.0005 in.
Damped
Yes
Gear Rack
Yes

Type
Optical Support Post w/ Base
Height
355.6 mm
Thread Type
7.4 mm CLR
Material
Steel
Diameter
38.1 mm

Diameter Tolerance
0.0005 in.
Damped
Yes
Gear Rack
Yes

Resources & Downloads

Drawings And Cad

Model 75-S(113.6 kB, PDF)

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Frequently Purchased Together

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M-360-90Angle Bracket, 90°, 1/4-20 (M6) Slots, 25 mm Spacing	METRIC	$103
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Similar

Description	Compatibility	Price
40Optical Post, 14 in. Height, 1.5 in. Diameter, 1/4-20 Thread	IMPERIAL	$160
71Optical Post, Gear Rack, 7 in. Height, 1.5 in. Diameter, 1/4-20 Thread	IMPERIAL	$243
70Optical Post, Gear Rack, 14 in. Height, 1.5 in. Diameter, 1/4-20 Thread	IMPERIAL	$251
45Damped Optical Post, Mounting Base, 14 in. Height, 0.29 in. CLR	UNIVERSAL	$288
72Optical Post, Gear Rack, Mounting Base, 24 in. Height, 1.5 in. Diameter	UNIVERSAL	$496

Compatible

Description	Compatibility	Price
VPBXY Adjustable Base, 1/4-20 Thread	IMPERIAL	$288
32AOptical Post Positioner, Cap Screw, 0.7 in. Adjustment, 1.5 in. Post, 1/4-20	IMPERIAL	$176
34Rotatable Post Platform, Arbitrary Angle Mounting, 1.5 in. Post, 1/4-20	IMPERIAL	$196
370-RCPost Clamp, 1.5 in. Diameter Gear Rack Posts, 1/4-20 Thread	IMPERIAL	$208
M-370-RCPost Clamp, 38.1 mm Diameter Gear Rack Posts, M6 Thread	METRIC	$208