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Ø1.5" Damped Posts


  • Dynamically Damped Ø1.5" Post Reduces Mechanical Vibrations
  • Nickel-Plated Steel with a Matte Finish
  • Permanent Mounting Base with Four 1/4" (M6) Counterbores

HeNe Laser in C1503
V-Mount on DP14A Post

Application idea

Four 1/4" (M6) Counterbores for Mounting

DP14A

DP8A

DP10A

DP12A

Related Items


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DP14A Periscope
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Periscope Constructed from a DP14A Damped Post, C1501 Post Clamps, and POLARIS-K1 Mirror Mounts
DP14A Top Cap
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Damped Posts Feature an Engraved Top Cap Indicating the Item # as well as a 1/4"-20 (M6) Tapped Hole

Features

  • Ø1.5" Stainless Steel Posts Designed to Reduce Vibrations
  • Lead-Free Damping Weight Design for Shorter Damping Times Compared to Solid Stainless Steel Posts
  • 8", 10", 12", and 14" Long Versions Available
  • Nickel-Plated Steel with Matte Finish for Long Life
  • Permanent Mounting Base with Four 1/4" (M6) Counterbores

These Dynamically Damped Ø1.5" Mounting Posts offer a vibration-limiting alternative to long lengths of Ø1.5" solid steel posts. Damped posts are ideal for applications where mechanical vibrations must be limited, such as beam steering and imaging. Ring down testing was performed to compare the damping times for damped and solid stainless steel posts (see the Ring Down Test tab for a summary of the test results).

Damped posts are available in four lengths: 8" (203.2 mm), 10" (254.0 mm), 12" (304.8 mm), and 14" (355.6 mm). The damped posts are fabricated from steel with a nickel-plated matte finish and utilize internal damping weights containing no lead. Using an engineered passive vibration dampening design, an internal suspension system allows weights inside the post to move independently from the post's outer body, thus allowing vibrational energy to quickly be absorbed and dissipated. On imperial versions, the permanently attached mounting base has four 1/4" counterbores for breadboards with a 1.00" hole spacing, while the metric versions have M6 counterbores for breadboards with a 25.0 mm hole spacing. The top cap is engraved with the part number for identification. The posts also feature a top-located 1/4"-20 (M6) tapped hole to allow components to be secured to the top of the post.

Item #DP8A(/M)DP10A(/M)DP12A(/M)DP14A(/M)
Damping Timea 20 ms 47 ms 61 ms 73 ms
Resonant Frequency (Theoretical) 780 Hz 435 Hz 300 Hz ~200 Hz
Length 8" (203.2 mm) 10" (254.0 mm) 12" (304.8 mm) 14" (355.6 mm)
Weight 1.56 kg (3.44 lbs) 1.91 kg (4.21 lbs) 2.14 kg (4.72 lbs) 2.4 kg (5.3 lbs)
Top-Located Tapped Hole 1/4"-20 (M6); 0.33" (8.4 mm) Deep
Mounting Permanent Base with Four 1/4" (M6) Counterbores for Breadboards with 1.00" (25.0 mm) Hole Spacing
  • The post was struck with a 13 N force near the top of the post and the damping time (time for vibration amplitude to decrease to 1% of the initial value) was measured. Please see the Ring Down Test tab for details on the testing procedures and results.

Click to Enlarge
Initial Setup for Ring Down Test of DP10A Damped Post

Ring Down Test

A ring down test is performed on our damped and standard Ø1.5" posts to quantify the time needed to dampen vibrations to a minimum. To do this, a rig is set up (shown in the image to the right) that is designed to strike the test post with approximately 13 N of force (determined by measuring the peak force using a force gauge) by releasing a steel-ball-tipped lever arm that is held at a pre-determined height using a pin. A piezoelectric accelerometer, mounted flush to the top of the test post and aligned with the strike point of the lever arm, measures and records the acceleration of the post due to vibrations as a voltage signal. Because loads mounted to the post increase its vibration damping ability, no additional load is added during testing. Therefore, the results presented below represent the worst-case scenario for vibration damping. 

In each set of test results shown below, both standard and damped posts are tested to compare the damping time (time it takes to reduce the amplitude of vibrations by 99%). For all post lengths tested, the damped posts dissipate the vibrational energy in a significantly shorter time frame than a standard post. See below for graphs from individual test runs.

Ring Down Test Summary (Average Over 5 Tests)
Post Length Damping Time (Damped Posts)a Damping Time (Standard Posts)a
8" (203.2 mm) 20 ms 81 ms
10" (254.0 mm) 47 ms 124 ms
12" (304.8 mm) 61 ms 144 ms
14" (355.6 mm) 73 ms 155 ms
  • Damping time is defined as the time required for the amplitude of the vibrations to reach 1% of the initial value after being struck.

8" (203.2 mm) Long Posts


10" (254.0 mm) Long Posts


12" (304.8 mm) Long Posts


14" (355.6 mm) Long Posts

DP14A SmartPack Packaging
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DP14A Packaging
Item #% Weight Reduction% CO2 Reduction
DP8A(/M) 66% 74%
DP14A(/M) 66% 74%
Smart Pack

Smart Pack

  • Minimize CO2 Footprint
  • Reduce Non-Recyclable Packing Materials
  • Improve Packaging Integrity
  • Saves on Shipping Costs

Thorlabs' Green Initiative is aimed at reducing waste. To that end, we have begun to re-engineer our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the use of non-recyclable materials.

Over the course of a year, the re-engineered packaging across our product line is projected to reduce our CO2 footprint by more than 16,184 kg and reduce packaging by over 13,893 pounds! As we move through our product line, we will label re-engineered packages with our green Smart Pack sticker (above).


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Posted Comments:
Poster:jjean
Posted Date:2017-04-02 16:00:51.247
Would it be possible to provide a custom version of the DP8A post with mirror finish instead of matte finish? Thanks!
Poster:tfrisch
Posted Date:2017-04-18 04:45:48.0
Hello, I will reach out to you directly about your application. I would not recommend using a post as an optical mirror.
Poster:stump
Posted Date:2015-11-23 12:53:48.407
I was thinking of mounting a solid aluminum breadboard on top of 4 DP8A's instead of the standard 1.5 inch posts but wondered if I would still get the desired damping? The measurements (and pictures showing various uses) all use post mounts anchored along the cylinder--not sitting on top. Thank you.
Poster:besembeson
Posted Date:2015-11-25 02:31:41.0
Response from Bweh at Thorlabs USA: In the configuration you describe, the posts will be locked both at the top and the bottom which presents a more complex rigid system than the configuration we have tested for damping times we show on the website. It would seem you might gain little by using the damped posts in this manner but overall it will be a coupled system that we don't have damping time data for. The resonant frequency will also depend on the size/weight of the breadboard and setup that you have. In our tests, the top end of the posts are free standing.
Poster:urbancic
Posted Date:2015-09-17 12:20:56.087
Dear Sir or Madam, I'm interested in the Ø1.5" Damped Posts but I was wondering if is possible to get them other custom lengths. Best regards, Jurij
Poster:besembeson
Posted Date:2015-10-05 01:18:15.0
Response from Bweh at Thorlabs USA: Yes we can provide this. We will follow-up with you.
Poster:john.chiaverini
Posted Date:2014-04-24 09:26:19.37
What are the masses (or weights on earth) of the DP8A and the DP14A? Thanks. John C.
Poster:bsanii
Posted Date:2013-11-22 11:17:54.79
We bought the DP14A as a replacement for the DP14, because the base was welded on. Unfortunately we missed that you also removed the 1/4-20 thread on the top of the post, which we need. A couple questions: Can we tap the top of the DP14A, or will that release sand or the like? Alternatively, any strategies for keeping the base attached to the post on the DP14? I was about to buy some locktite. Thanks, Babak
Poster:cdaly
Posted Date:2013-12-04 01:54:46.0
Response from Chris at Thorlabs: Thank you for your inquiry. There's no reason you cannot tap the bottom of the DP14A. As long as you do not go further than an inch in depth, you will not even make it through the base plate piece. We can provide a custom version of the DP14A with a tap on the top if you would like though. If you would like to epoxy the base on the DP14, I would suggest Loctite 2760.
Poster:tcohen
Posted Date:2012-07-03 10:10:00.0
Response from Tim at Thorlabs: These posts are sealed with Loctite 2760 on the threads. I have contacted you to further discuss the suitability of this post.
Poster:jonathan.newport
Posted Date:2012-06-27 15:32:10.0
Are these posts sealed sufficiently to operate in vacuum at ~10^-6 torr? Thanks!
Poster:tcohen
Posted Date:2012-05-22 10:25:00.0
Response from Tim at Thorlabs: Thank you for your feedback! We are testing this and will provide you with an answer shortly.
Poster:
Posted Date:2012-05-16 16:25:01.0
What is the first natural frequency of vibration for the damped post DP14?
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
DP8A Support Documentation
DP8AØ1.5" Dynamically Damped Post, 8" Long
$176.00
Today
DP10A Support Documentation
DP10AØ1.5" Dynamically Damped Post, 10" Long
$185.00
Today
DP12A Support Documentation
DP12AØ1.5" Dynamically Damped Post, 12" Long
$194.00
Today
DP14A Support Documentation
DP14AØ1.5" Dynamically Damped Post, 14" Long
$203.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
DP8A/M Support Documentation
DP8A/MØ1.5" Dynamically Damped Post, 8" Long, Metric
$176.00
Today
DP10A/M Support Documentation
DP10A/MØ1.5" Dynamically Damped Post, 10" Long, Metric
$185.00
Today
DP12A/M Support Documentation
DP12A/MØ1.5" Dynamically Damped Post, 12" Long, Metric
$194.00
Today
DP14A/M Support Documentation
DP14A/MØ1.5" Dynamically Damped Post, 14" Long, Metric
$203.00
Today
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