Hi Ken
I see that you guys are talking about this in the specific context of
sample changers and so this is a bit of a tangent. On one of my manually
operated instruments, the spinner was getting stuck on top of the BST. The
cause turned out to be rather mundane i.e. oily deposits that seemed to
have accumulated (over a period of thousands of human hours) just about an
inch below the top so it is not easily visible. The seemingly mild deposit
was enough to cause a block preventing the spinner descending smoothly.
Cleaning it with Kimwipes and IPA took care of it. Even in 2024, looks
like the laws of Physics operate the same way and the good old lessons of
ensuring that the sample tube and spinner are clean before you put them in
the magnet, seems to hold good !
Gave me an opportunity to boast about the fine engineering tolerances
that are involved in making an NMR machine tick, to some green horn users.
Best
Rajan
On Wed, Mar 6, 2024 at 7:03 AM ter Horst, Marc A. <terhorst_at_email.unc.edu>
wrote:
> Hi Ken and Hasan
>
> Yes. On two of our systems with a SampleXpress. Went through the same
> adjustments, o-rings, spinners, source compressed gas pressure, sample lift
> adjustment. Also tried re-adjusting the bed of the SampleXpress and with a
> level. Does this happen with ‘regular’ 5mm tubes or J-young
> tubes or both?
>
>
>
> Will try Hasan’s recommendation (Thank you!).
>
>
>
> Marc
>
>
>
>
>
> *From:* main_at_ammrl.groups.io On Behalf Of Hasan Celik via groups.io
> *Sent:* Wednesday, March 6, 2024 10:00 AM
> *To:* main_at_ammrl.groups.io
> *Subject:* Re: [AMMRL] Bruker SampleCase: Samples getting stuck as they
> are dropped down the transport tube
>
>
> Hello Ken,
>
> We had this problem before. It turned out that the bolts holding the metal
> part that guides the spinner into the transport tube got loose over time
> (~5 years after the installation). I had to remove the plastic transparent
> plastic cover around the unit to access them. Once I lined up the metal
> part that latches onto the plastic tube and tightened the bolts, it didn't
> happen again.
>
> Best,
>
> Hasan
>
>
>
> On Wed, Mar 6, 2024 at 6:54 AM Kenneth Sharp-Knott wrote:
>
> Has anyone had any issues with their spinners getting stuck at the top of
> the transport tube as they are dropped? It is a little difficult to see
> just why they're getting stuck, but they appear to be kinked at an angle at
> the top of the transport tube.
>
> I've changed the rubber band - no effect.
>
> The air pressure may be a bit lower than what Bruker wants 5.5 bar vs 6,
> but it's the same exact air pressure I've had since it was installed.
>
> Seeking the usual wise advice and counsel for the AMMRL greats.
>
> Ken Sharp-Knott
>
> Manager of Analytical Services and the NMR Facility
> Department of Chemistry
> Virginia Tech
>
> (540)267-6502 (Cell)
> (540)231-0885 (Office)
>
> --
>
> _____________________________
>
> Director, PMRC Core NMR Facility
> College of Chemistry
> University of California, Berkeley
> 227A Hildebrand Hall
> Office: (510) 643-9829
> Cell: (949) 732-8175
>
>
--
____________________________________
Rajan K Paranji, Ph.D.NMR Services Manager
*Department of Chemistry**Room 65, Bagley Hall*
University of WashingtonSeattle, WA 98195
phone : 206 685 2581 fax: 206 685 8665email: rajanp_at_uw.edu
____________________________________________________________________
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Received on Wed Mar 06 2024 - 09:30:32 MST