Discussion Category: Centrifuge
Beckman Coulter Allegra X-14 Series rotor vibration
Beckman Coulter Allegra X-14 Series rotor vibration Are the bucket pins on the SX 4750 rotor replaceable?
Yes, the pins are replaceable but in all of my many years at BCI working on that kind of rotor, normally all they need are removal, cleaning, and relubricating as well as the doing the same to the pockets on the buckets. You also did not specify which rotor type you are using. The standard swinging bucket rotor or the Aries type. They both need the same kind of periodic service around every 6 months if you are using the centrifuge regularly.
It looks like this one has been unloved for most of its 8 years. SX4750 rotor with 2 buckets at 681g and 2 plate carriers at 778g.
Like I said, the rotor pins can be removed, cleaned and relubricated quite easily. If you don't want to clean the pins then you can purchase them from Beckman but it is generally a lot cheaper just to get in the habit of regular cleaning and lubrication. Make sure than you also clean the openings where the pins go into the rotor to get the old grease out before applying fresh grease to the pins. The pockets on the buckets and carriers can also be cleaned and then a LIGHT lubricant can be applied into the pockets. Lack of lubrication is by far the biggest cause of vibrations DEPENDING upon what speed you are running the rotor at. 600 RPM is generally really bad and then every 600 RPM from there it should get progressively smoother although 1,200 RPM can still be quite pronounced. It is literally the physics of rotating bodies in centrifuges. Also, it is generally better to run all buckets or all plate carriers but if all you have is 2 of each then you still want to adequately balance all of the loads and than may require putting blanks in either the tube adapters in the buckets or loading up some dummy plates. Balance is literally everything to getting the least amount of vibration. Hope this helps.
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