We replaced the slip couplings inside our protune units with lower
torque ones about 10 years ago and haven't had that problem since then.
You can get them from Machine Components.
https://catalog.machinecomp.com/item/slip-couplings/spring-wrapped-jaw-clamp-slip-coupling-cl-series/cl-16
I think that the one that was installed by default has the number
CL-16-18-18-10 and you can get one with lower torque but I don't
remember exactly which one we used as replacement. It is also well
known that the grease inside becomes gummy and sticky overtime, and you
can also just get it (better yet all of them) and clean them inside and
relubricate them.
Good luck.
Eugenio
Eugenio Alvarado, Ph.D.
NMR Facility Director
Chemistry Department, room 3500. University of Michigan
930 N. University Ave., Ann Arbor, MI 48109-1055.
Voice: (734)-764-9924
On 3/10/25 12:46 PM, Shawn Wagner via groups.io wrote:
> Hi Varian Users,
>
> Has anyone else had the issue that the ProTune motors are exerting too
> much force on the tune rods? The probe capacitors for the X channel
> are being over tuned during the indexing and one broke the gear free
> from the rod. Unlike the highband channel capacitors which have turn
> limiters to protect the capacitors, the X band does not. Is a way to
> reduce the power to the motors?
>
> Shawn
>
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#2146): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/2146__;!!PvDODwlR4mBZyAb0!V-hogYuEitPXaMthcdwpJtDqL9pzZL=
uCRO14nWVjZhPSHNDtpdzHeNEuHP2jyNtzvdEbVKi8MTbC7Qdv1h1dpeqs4Vg$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/111623088=
/7559972__;!!PvDODwlR4mBZyAb0!V-hogYuEitPXaMthcdwpJtDqL9pzZLuCRO14nWVjZhPSH=
NDtpdzHeNEuHP2jyNtzvdEbVKi8MTbC7Qdv1h1dymmG-9E$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Mon Mar 10 2025 - 11:24:14 MST