Hi All,
Many thanks for all the replies on this thread! We learned a lot about
spinners and sample changers. We had a chance to troubleshoot our setup
with all this information and realized that our problem was likely the VT gas
flow being set a bit too high. The indicator showed that the sample was
down, but we could not get a lock signal. This was causing the lighter
3mm POM spinners to sit a bit above the ideal setpoint inside the bore.
Once we turned the VT gas flow down a little bit, the samples seem to situate
much better and we are consistently getting proper operation from the lighter
3mm POM spinners.
There were a few other questions/comments on this thread that I will attempt
to address below as well:
*J-Young Tubes in sample changer/automation units* : Our Bruker
400/500 have run through hundreds of J-Young tubes in our 60-position Sample
XPress without any problems over the past couple years. As long as
the air pressure is set to the correct settings, it seems to work quite
reliably.
*3D printed spinners:* A few folks have asked about this, and so far I can
say that it is indeed possible to use 3D printed spinners (but it depends
on your hardware). Folks here commented about the tight tolerances
that are required, and that is spot on with what we've noticed.
We have been using SLA printed 3D spinners in our Bruker 500 for the past
year and they have performed just as well as Bruker's original POM spinners.
SLA prints allow very good layer and spatial resolution, and it seems to
be good enough for this application. The spinners have held up
surprisingly well so far. I would estimate that our printed spinners
have run hundreds of samples over the past year and they are not showing any
abnormal signs of wear.
I have designed spinners for specific resins to match the weight and tolerances
of Bruker's spinners. Resins prints involve some shrinkage during
the curing process, and their density is depending on the resin material.
Hence each design needs to be modified to take these into account.
I'd estimate that our printed spinners cost about $5 each, and we can print about
16 of them in a few hours. My current recommendation is to use FormLabs
High Temp resin. This provides a really smooth finish, and the spinners
can be used for temperatures up to 180C (not tested!) with proper high-temp o-rings
(available from McMaster). We buy the spinner stickers directly from
Bruker and stick them on the printed spinners. We've had a lot of success
with the FormLabs clear resin as well.
The only issue we've had with 3D printed spinners is that the hardware seems to
be very picky about them. The same exact spinners that work on our
Bruker 500 do not work on our Bruker 400, even though they have identical model
60-pos sample express units installed. We haven't figured out why this is
the case.
I am happy to share the design for those that are interested. I'm not
sure if posting the file here is allowed, so please email me if you're interested!
Best,
Samrat
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Received on Fri May 24 2024 - 12:16:04 MST