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<span>Hello Peter,<br><br>-Yes, the outside diameter is very well attached to the bearing.<br>
<br>-The belt is not so tight but not so loose and it is an O-ring type.<br>
I just tried using a very tight belt and obtained the same results as <br>
with the normal tighten belt. I made the testing using a rubber band as<br>
well and I obtained a bigger shift (because the material is more elastic).<br>
<br>-About how snug is the sample to the sample holder: I made the test without<br>
sample. I just stichted a tape with a drawn arrow to each pulley and made the comparison.<br>
<br>I already check all the possibilities that could cause the problem. So<br>
I will try to solve the issue using either a timing belt & pulleys or a little plastic chain & sprockets.<br>
Hopefully it will solve the problem.<br><br>Have a nice weekend too.<br>
<br>Kind regards,<br>Edgar<br><br><br><table border="0" cellpadding="0" cellspacing="0" width="457,5">
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<br>Fraunhofer-Institut für Produktionstechnologie IPT <br>Edgar Escobar Nieto <br>
<br><br> <br> <br>Steinbachstraße 17 <br>52074 Aachen <br><br>edgar.escobar.nieto@ipt.fraunhofer.de </font>
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<font color="blue" face="sans-serif" size="2"><u>http://www.ipt.fraunhofer.de</u>
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<br><br><font color="#990099">-----"Peter Gabriel Pitrone" <pitrone@mpi-cbg.de> schrieb: -----</font>
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An: edgar.escobar.nieto@ipt.fraunhofer.de<br>Von: "Peter Gabriel Pitrone" <pitrone@mpi-cbg.de><br>
Datum: 13.09.2013 15:08<br>Kopie: openspim@openspim.org<br>Betreff: Re: [OpenSPIM] About the rotational position 4D-Stage<br>
<br><div><font face="Courier New,Courier,monospace" size="2">Hello Edgar,<br>
<br>A few thoughts on the subject at hand:<br><br>- Is the outside diameter of the sample pulley snug into the ball<br>
bearing, or doe is slip?! Maybe you could use some teflon tape to made it<br>
more snug if this is the case.<br><br>- How loose or tight is the belt?! Is it an O-ring type belt, or more<br>
like a rubber band?!<br><br>- And lastly, how snug is your sample held in the sample pulley?!<br>
<br>Your idea of the timing pulleys and plastic sprocket/chain link isn't a<br>
bad one at all, I'm just not sure if it will be the answer...<br><br>Have a great weekend!<br>
<br>Pete<br><br>-- <br>Peter Gabriel Pitrone - TechRMS<br>Microscopy/Imaging Specialist<br>
Prof. Dr. Pavel Tomancak group<br>Max Planck Institute for<br>Molecular Biology and Genetics<br>
Pfotenhauerstr. 108<br>01307 Dresden<br><br>"If a straight line fit is required, obtain only two data points." - Anon.<br>
<br><br>On Fri, September 13, 2013 2:28 pm, edgar.escobar.nieto@ipt.fraunhofer.de<br>
wrote:<br><|> Hi dear All,<br><|><br><|> I have noticed a problem with the rotational axis of the USB 4D-Stage.<br>
<|><br><|> When the motor is driven without the belt that transmits the<br>
movemente to<br><|> the sample holder, it<br><|> works perfectly. The problem is that when I use the belt to transmit the<br>
<|> movement from the motor<br><|> to the sample holder, there is a shift in angles between the axis of the<br>
<|> motor and the axis of the sample<br><|> holder, and every time I perform an angle movement the shift increases.<br>
<|> At the same time the position of the<br><|> motor axis is affected causing no repetability when using the belt. So,<br>
<|> I can't position the sample to the exact angle I desire.<br>
<|><br><|> I don't know if the problem of this situation is because the belt is not<br>
<|> so tight. I would like to know if some<br><|> of you have had this issue and how could you solve it.<br>
<|><br><|> I have thought to solve the issue replacing the normal pulleys and belt<br>
<|> for timing pulleys and belt or little plastic sprockets and chain<br>
<|> in order to avoid the slipping.<br><|><br><|> Kind regards,<br>
<|> Edgar<br><|><br><|><br><|> <br>_________________________________________________________________________<br>
<|><br><|> Fraunhofer-Institut für Produktionstechnologie IPT<br>
<|> Edgar Escobar Nieto<br><|><br><|><br><|><br>
<|><br><|> Steinbachstraße 17<br><|> 52074 Aachen<br>
<|><br><|> edgar.escobar.nieto@ipt.fraunhofer.de<br><|> <a href="http://www.ipt.fraunhofer.de">
http://www.ipt.fraunhofer.de</a><br><|><br>_________________________________________________________________________<br>
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