Back in business

JerryM

Okay, I have been having trouble achieving a suitable vacuum. Today i replaced the o-ring seal on my diffusion pump. While I had it out I found the nameplate that said "use 50cc of DP oil. When I poured it out (much spilling) I discovered that I had way too much. Probably 100cc.
After adjusting the quantity the pump worked like new. I got to 10X10-5, without using the cold trap. I am sure that with the cold trap I will do much better.
On to coat some mirrors.

Jerry

JerryM

#3751

oops,
Still had a problem where it wouldn't pump below 100 microns. Upon examination I found that air was trapped in the high current feed throughs (yes both of them) Hopefully cutting a relief channel will solve this problem. I am pumping as I write.

Jerry

Show quoted text

--- In VacuumX@..., "JerryM" <gandamiller@...> wrote:

Okay, I have been having trouble achieving a suitable vacuum. Today i replaced the o-ring seal on my diffusion pump. While I had it out I found the nameplate that said "use 50cc of DP oil. When I poured it out (much spilling) I discovered that I had way too much. Probably 100cc.
After adjusting the quantity the pump worked like new. I got to 10X10-5, without using the cold trap. I am sure that with the cold trap I will do much better.
On to coat some mirrors.

Jerry

JerryM

#3752

--- In VacuumX@..., "JerryM" <gandamiller@...> wrote:
As I said on to coat mirrors. I just uploaded a photo of the setup in my bell jar.  The mirrors have a small radius and would not coat on the edges. That is why there is a small motor inside to turn the mirror during coating. this setup is very successful.

Jerry

开云体育

Back in business