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Ø1.5" Damped Post

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Ø1.5" Damped Post




  • Dynamically Damped Ø1.5" Post Provides Fast Ring Down
  • Nickel-Plated Steel with a Matte Finish
  • Permanent Mounting Base with Four 1/4" (M6) Counterbores

Features

  • Dynamic Damping Provides Fast Ring Down
  • Nickel-Plated Steel with Matte Finish for Long Life
  • Permanent Mounting Base with Four 1/4" (M6) Counterbores
  • ~200 Hz Fundamental Frequency
  • Weight: 6.85 lb (3.1 kg)

The DP14A(/M) is a dynamically damped Ø1.5" mounting post that provides a vibration-limiting alternative to long lengths of solid steel Ø1.5" posts. This post features optimized damping that outperforms other damped post designs, exhibiting a fundamental frequency of approximately 200 Hz for quick ring down. The post is fabricated from steel with a nickel-plated matte finish and utilizes internal damping weights containing no lead. The permanently attached mounting base has four 1/4" (M6) counterbores, and the top cap is engraved with the part number for identification.

Ring Down Testing Comparison
The plots below show ring down test results for the DP14A post; our standard solid steel Ø1.5", 14" long post (P14); and a hollow Ø1.5", 14" long steel post. A 3.6 lb (1.6 kg) load (Thorlabs' C1501 clamp, KS4 mount, and BB4-E03 mirror) was mounted approximately 2" from the top of the post. Each post was struck approximately 0.5" from the top with an impulse hammer, and oscillations were measured with an accelerometer mounted to the top of the post (see photo below, to the right).

The test results show that the DP14A damped post dissipates the vibrational energy in a significantly shorter time frame than the other posts. The damped post's amplitude of oscillations dropped to 2% of the initial value within 250 ms and was below the test instrument's noise floor after 500 ms. In contrast, the solid P14 post's oscillations showed a vibrational amplitude of 23% of the initial value after 250 ms and 3.5% after a full 1.5 s. Similarly, the hollow post had a vibrational amplitude of 22.5% of the initial value after 250 ms and 3% after 1.5 s.

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