Features

• Post Holder with Flexure Locking Mechanism for Ø1" Posts
• Pedestal Base Compatible with PF175 Clamping Fork
• Available Lengths: 1.5" (38 mm), 2" (50 mm), 3" (75 mm), and 4" (100 mm)
• Imperial and Metric Locking Options Available

These Ø1" Post Holders are the ideal solution for mounting optical components when a specific height has not been determined. Our line of Ø1" Posts covers a range of fixed heights; however, these post holders allow more height flexibility while still using our Ø1" stainless steel posts. The stability provided by the RSH series of post holders is equivalent to that provided by either directly threading the post into the optical table or by utilizing a pedestal post with a clamping fork. A taller post holder should be used with a longer post in order to obtain the greatest stability. Please see the Stability Tab for more information.

The flexure design supports the post in a clamping mechanism that is secured with an 8-32 (M4) cap screw. The bore has two grooves: a circular groove and a square groove. The circular groove allows the metal to flex and clamp the post's position without breaking. The square groove provides two fixed contact lines for the post to ensure it will always be locked into the same place. These post holders have a pedestal base and can be easily secured to a breadboard or optical table using the PF175 clamping fork.

Stability Test Setup
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The stability of the Ø1" post mounted in an RSH flexure post holder was compared to that of a post directly threaded to a breadboard as well as one utilized with a pedestal base and secured to a breadboard with a clamp. The setup (shown to the right) consisted of an RS6 post held in an RSH post holder that was clamped to an optical table with a PF175 clamping fork. A moment arm was clamped to the post, and a load was applied to the end of the arm. As varying loads were applied to the moment arm, the deflection of the post was measured with a dial indicator that provided 0.001" accuracy. The experiement was then repeated for the a directly mounted post and the post mounted to the breadboard with the use of a pedestal base and clamping fork. The graph below displays the results.

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The test results indicate the RSH post holder is not significantly less stable then the other two mounting options. However, when a shorter post holder was used with a longer post, the system was less stable. We recommend that you use a taller post holder with taller posts to avoid stability loss.