Downstairs centrifuge rotor II

Here is an illustration to better explain what's going on with the centrifuge rotor capsule.

I took the capsules back to the machine shop today. The problem was that while the machine shop drawings show a slanted inside edge, there is no 'call-out' with numbers so it's easy to miss the slant. The machine shop will fix them for us; they will put in a 30 deg inside slant. I can pick them up Tuesday afternoon.

Chatted a bit with Carlheinz. His office is being remodeled and they are having walls put in to keep out the dust and noise. They've thrown out cabinets, papers, and books that have been there for as long as 40 years, making way for computers and the electronic age.

Downstairs centrifuge rotor

I'd been having some trouble spinning my growths using the new centrifuge downstairs. Somehow, when depositing my growth into the centrifuge capsule, it would often get stuck on the lip of the capsule and I would waste valuable seconds poking it to make it go in. This happened several times before I realized that the capsules had not been machined exactly to specifications. While the upstairs, original centrifuge capsules have slanted lips, the ones on the new capsules are completely horizontal - thus providing a ledge on which my growths can get stuck.

Since I realized this, I've been bringing one of the old capsules downstairs to do my spin. Eventually I'll go to the machine shop to see if the new capsules can be fixed.