Inserting the depth gauge into the bore is pretty easy to prevent by inserting the gauge into a hole drilled in the center of a large 2" dia. rubber stopper, which won't fit in the bore. Slicing off one edge from the stopper prevents it from rolling.
Another problem we had with depth gauges was that the adjustments loosened and samples broke from protruding too far out the bottom of the spinner. To prevent this we had some custom gages fabricated from acrylic for a fixed maximum depth. Lines scored on the acrylic allow the user to see where the coil center is in case they have a small sample volume to center in the coil. The fabricated gages have a large diameter at one end to also prevent accidental insertion into the bore.
Cheers, -Hirsch
Jerry Hirschinger, NMR Instrumentation Specialist
Purdue Interdepartmental NMR Facility
560 Oval Dr. West Lafayette, IN 47907-2084
Office: Wetherill 365A
Phone / Fax: (765) 494-5288 / 494-0239
Cellular: (765) 427-3034
-----Original Message-----
From: Roger Bourne [mailto:roger.bourne_at_sydney.edu.au]
Sent: Monday, November 14, 2011 6:56 PM
To: AMMRL
Subject: RE: AMMRL: How to retrieve empty spinners
And then there is the user who drops the sample PLUS depth gauge into the bore....
Roger Bourne
Discipline of Medical Radiation Sciences | Faculty of Health Sciences THE UNIVERSITY OF SYDNEY
CRICOS 00026A
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-----Original Message-----
From: Rudi Nunlist [mailto:rudi.nunlist_at_gmail.com]
Sent: Tuesday, 15 November 2011 6:58 AM
To: gozim_at_nmr.uni-frankfurt.de
Cc: AMMRL
Subject: Re: AMMRL: How to retrieve empty spinners
Another way is to use a round wooden dowel. Those were used quite frequently.
The UCB wood shop has some that fit an empty spinner bore pretty well.
Hardware or hobby stores might have them as well.
For the reverse situation, where users forget the spinner and drop the sample into the magnet, the same dowels and a loop of double sided tape works for fishing the sample out.
Both methods had to be used more than once, they are well tested.
Best Regards,
Rudi Nunlist
------ On Sun November 13 2011 11:43, gozim_at_nmr.uni-frankfurt.de wrote:
=Spinlanders,
=
=before you start to dismount your probe holder to fetch an empty =spinner (without a tube) try the following:
=Insert the next sample as usual, and lift it again.
=
=Have a good field,
=
=JGZim
=
=
=
=
Received on Tue Nov 15 2011 - 06:27:41 MST