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Entry  Fri Feb 10 17:16:28 2017, Gabriele, Mechanics, Daily Progress, Translation stage to move retaining rings 2017-02-10_16.32.55.jpg2017-02-10_16.33.03.jpg
    Reply  Sat Feb 11 16:22:26 2017, Gabriele, Mechanics, Daily Progress, Translation stage to move retaining rings 
Message ID: 303     Entry time: Fri Feb 10 17:16:28 2017     Reply to this: 304
Author: Gabriele 
Type: Mechanics 
Category: Daily Progress 
Subject: Translation stage to move retaining rings 

This afternoon I installed the picomotor and the translation stage that will be used to move the retaining rings up and down. No partciular problem: I only had to add some small aluminum foil shims between the ear of some rings and the square plate, to make the rings as horizontal as possible.

I tested the motion: with 300000 steps it's possible to move the rings all the way from the parked (down) position, to the up position. I also checked that when the rings are up, I can place four substarates and they fall properly into the alignment groove. Since the maximum speed of the picomotor is 2000 steps/s, it takes 150 seconds to move up and down the ring. 

Finally, positive steps means that the rings are moving up, negative that they're moving down.

I raeligned the optical levers to the position I obtained by centering the samples with the rings. I haven't tested the repeatability yet.

 

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