[OpenSPIM] About the rotational position 4D-Stage

[edgar.escobar.nieto at ipt.fraunhofer.de]

 Hello Peter,

-Yes, the outside diameter is very well attached to the bearing.

-The belt is not so tight but not so loose and it is an O-ring type.
 I just tried using a very tight belt and obtained the same results as 
 with the normal tighten belt. I made the testing using a rubber band as
 well and I obtained a bigger shift (because the material is more elastic).

-About how snug is the sample to the sample holder: I made the test without
 sample. I just stichted a tape with a drawn arrow to each pulley and made the comparison.

I already check all the possibilities that could cause the problem. So
I will try to solve the issue using either a timing belt & pulleys or a little plastic chain & sprockets.
Hopefully it will solve the problem.

Have a nice weekend too.

Kind regards,
Edgar


 _________________________________________________________________________

Fraunhofer-Institut für Produktionstechnologie IPT 
Edgar Escobar Nieto  
 

 
 
Steinbachstraße 17 
52074 Aachen 

edgar.escobar.nieto at ipt.fraunhofer.de 
http://www.ipt.fraunhofer.de
_________________________________________________________________________
 
 
 


-----"Peter Gabriel Pitrone" <pitrone at mpi-cbg.de> schrieb: -----
An: edgar.escobar.nieto at ipt.fraunhofer.de
Von: "Peter Gabriel Pitrone" <pitrone at mpi-cbg.de>
Datum: 13.09.2013 15:08
Kopie: openspim at openspim.org
Betreff: Re: [OpenSPIM] About the rotational position 4D-Stage

Hello Edgar,

A few thoughts on the subject at hand:

- Is the outside diameter of the sample pulley snug into the ball
bearing, or doe is slip?! Maybe you could use some teflon tape to made it
more snug if this is the case.

- How loose or tight is the belt?! Is it an O-ring type belt, or more
like a rubber band?!

- And lastly, how snug is your sample held in the sample pulley?!

Your idea of the timing pulleys and plastic sprocket/chain link isn't a
bad one at all, I'm just not sure if it will be the answer...

Have a great weekend!

Pete

-- 
Peter Gabriel Pitrone - TechRMS
Microscopy/Imaging Specialist
Prof. Dr. Pavel Tomancak group
Max Planck Institute for
Molecular Biology and Genetics
Pfotenhauerstr. 108
01307 Dresden

"If a straight line fit is required, obtain only two data points." - Anon.


On Fri, September 13, 2013 2:28 pm, edgar.escobar.nieto at ipt.fraunhofer.de
wrote:
<|>  Hi dear All,
<|>
<|> I have noticed a problem with the rotational axis of the USB 4D-Stage.
<|>
<|> When the motor is driven without the belt that transmits the
movemente to
<|> the sample holder, it
<|> works perfectly. The problem is that when I use the belt to transmit the
<|> movement from the motor
<|> to the sample holder, there is a shift in angles between the axis of the
<|> motor and the axis of the sample
<|> holder, and every time I perform an angle movement the shift increases.
<|> At the same time the position of the
<|> motor  axis is affected causing no repetability when using the belt. So,
<|> I  can't position the sample to the exact angle I desire.
<|>
<|> I don't know if the problem of this situation is because the belt is not
<|> so tight. I would like to know if some
<|> of you have had this issue and how could you solve it.
<|>
<|> I have thought to solve the issue replacing the normal pulleys and belt
<|> for timing pulleys and belt or little plastic sprockets and chain
<|> in order to avoid the slipping.
<|>
<|> Kind regards,
<|> Edgar
<|>
<|>
<|> 
_________________________________________________________________________
<|>
<|> Fraunhofer-Institut für Produktionstechnologie IPT
<|> Edgar Escobar Nieto
<|>
<|>
<|>
<|>
<|> Steinbachstraße 17
<|> 52074 Aachen
<|>
<|> edgar.escobar.nieto at ipt.fraunhofer.de
<|> http://www.ipt.fraunhofer.de
<|>
_________________________________________________________________________
<|>
<|>
<|>
<|> _______________________________________________
<|> OpenSPIM mailing list
<|> OpenSPIM at openspim.org
<|> http://openspim.org/mailman/listinfo/openspim
<|>


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