[OpenSPIM] twister motor belt slipping

[Hartmann Harz]

Hi Michael,
sorry for my delayed answer, your e-mail was filtered out.

However, I asked the head of our workshop and he toled me that he 
mounted a 6001 bearing (the number means outer diameter 28 mm, inner 
diameter 12 mm hight 8 mm) into our setup. This bearing has no sealing 
and no grease and is made of brass (balls, cage). He told me that such 
bearings are available as a standard for example from SKF oder FAG. For 
the exact number you should ask your local dealer because there are 
hundreds of different bearings available.

The belt was customized from bulk stock. They cutted of a piece of 
appropriate length and glued the cutted edges together with sperglue. I 
was surprised to see this, but it works fine.

Best

Hartmann




On 20.11.2014 18:02, Michael Redd wrote:
> Thank you for the informative reply. I would be much obliged if you 
> would provide me the part information on the replacement bearings and 
> belt.
>
> From: Hartmann Harz <harz at biz.uni-muenchen.de 
> <mailto:harz at biz.uni-muenchen.de>>
> Date: Wednesday, November 19, 2014 2:20 PM
> To: Michael Redd <mredd at cores.utah.edu <mailto:mredd at cores.utah.edu>>, 
> "openspim at openspim.org <mailto:openspim at openspim.org>" 
> <openspim at openspim.org <mailto:openspim at openspim.org>>
> Cc: "edgar.escobar.nieto at ipt.fraunhofer.de 
> <mailto:edgar.escobar.nieto at ipt.fraunhofer.de>" 
> <edgar.escobar.nieto at ipt.fraunhofer.de 
> <mailto:edgar.escobar.nieto at ipt.fraunhofer.de>>
> Subject: Re: [OpenSPIM] twister motor belt slipping
>
> Dear Michael,
> in the bginning I also had the problem of belt slipping. At least I 
> was believing that the belt slips. Later I learned that the belt 
> tesion was to high and the bearing was hard-steering. This results 
> during the operation of the twister stepping motor in a loss of steps. 
> Loss of steps or slipping has the same effect, the twister does not 
> turn to the expected angle. We solved this issue by exchanging the 
> bearing with a smooth running one and by a LONGER belt producing lower 
> tension and thereby lower friction in the bearings of the motor and 
> the sample holder.
>
> I don't know if this helps to solve your problem but eventually this 
> could help others. At least here in Munich it worked.
>
> Best regards
>
> Hartmann
>
> -- 
> Dr. H. Harz
> Ludwig-Maximilians-Universität München
> Biozentrum
> AG Prof. Leonhardt
> Raum B02.059
> Großhaderner Straße 2
> 82152 Martinsried
> Germany
> Phone: +49(89)2180-74 259
> Fax: +49(89)218099-74 236
> Mail:harz at biz.uni-muenchen.de
>
>
> On 19.11.2014 18:42, Michael Redd wrote:
>> I am struggling with the twister motor belt slipping that others have 
>> mentioned.  I have seen the toothed belt used by Edgar's group in 
>> Aachen and would be much obliged if he described this in more detail 
>> so I could copy it.
>> -- 
>> Michael Redd
>> Imaging Specialist
>> Microscopy Core Facility
>> University of Utah
>> Radiobiology Bldg,Room 55
>> Salt Lake City, Utah
>>
>>
>> _______________________________________________
>> OpenSPIM mailing list
>> OpenSPIM at openspim.orghttp://openspim.org/mailman/listinfo/openspim
>
> -- 
> Dr. H. Harz
> Ludwig-Maximilians-Universität München
> Biozentrum
> AG Prof. Leonhardt
> Raum B02.059
> Großhaderner Straße 2
> 82152 Martinsried
> Germany
> Phone: +49(89)2180-74 259
> Fax: +49(89)218099-74 236
> Mail:harz at biz.uni-muenchen.de

-- 
Dr. H. Harz
Ludwig-Maximilians-Universität München
Biozentrum
AG Prof. Leonhardt
Raum B02.059
Großhaderner Straße 2
82152 Martinsried
Germany
Phone: +49(89)2180-74 259
Fax: +49(89)218099-74 236
Mail: harz at biz.uni-muenchen.de

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