Search found 152 matches

by Michael Bretti
Fri Nov 16, 2018 5:20 pm
Forum: New User Chat Area
Topic: Ameen's designing efforts
Replies: 4
Views: 112

Re: Ameen's designing efforts

Ameen, If that turbopump is in good, working condition, then you are pretty much golden. Having a pump that can directly mate to your 4.5" CF chamber is a massive boost and makes things much easier. No need to mess around with custom adapter plates and o-ring seals. As long as the seller allows you ...
by Michael Bretti
Fri Nov 16, 2018 4:07 pm
Forum: New User Chat Area
Topic: Ameen's designing efforts
Replies: 4
Views: 112

Re: Ameen's designing efforts

In terms of cost, I think your overall prices are pretty reasonable. A 4.5" 6-way cross for $395 total including shipping is a decent deal, usually 6-way cross are quite expensive even used. As always, negotiating for the lowest price is always preferable if possible. I would say that for your zero-...
by Michael Bretti
Wed Nov 07, 2018 7:01 pm
Forum: Vacuum Technology (& FAQs)
Topic: TEFLEX seals for ISO-K
Replies: 6
Views: 296

Re: TEFLEX seals for ISO-K

For reference, the numbers I found for chilled flanges in vacuum texts are in comparison for a system that can be pumped down to only 10^-8 normally. With chilling, the ultimate pressure dropped to 10^-9. I believe this was for diffusion pumped systems. While chilling would not see very much gains i...
by Michael Bretti
Wed Nov 07, 2018 2:40 am
Forum: Vacuum Technology (& FAQs)
Topic: TEFLEX seals for ISO-K
Replies: 6
Views: 296

Re: TEFLEX seals for ISO-K

Georg, If you want to get lower with elastomer seals, then the seal needs to be chilled below ambient temperature. Viton, buna-N, butyl, and even teflon have been shown to be good to down to 10^-9 torr if chilled to about 6C or less. In order to accomplish this when between flanges in a system, both...
by Michael Bretti
Mon Oct 22, 2018 2:42 am
Forum: The Trading Post
Topic: Michael Bretti - High Vacuum Surplus FOR SALE - September 2018
Replies: 2
Views: 850

Re: Michael Bretti - High Vacuum Surplus FOR SALE - September 2018

New update to the for sale posting. The following items have sold and are no longer available: 2.) Nor-Cal 61-344778-00 90 Degree KF25 to Conflat 2.75" Pneumatic Valve 3.) MDC 2.75" Conflat Manual Butterfly Isolation Valve 4.) Varian 2.75" Conflat Sorbtion Pump with Full Adsorbent Load and Foam Cryo...
by Michael Bretti
Thu Oct 18, 2018 12:51 pm
Forum: Vacuum Technology (& FAQs)
Topic: Updated Diffusion Pump Assembly and Thermal Modeling
Replies: 3
Views: 410

Re: Updated Diffusion Pump Assembly and Thermal Modeling

Jerry Biehler, Thanks for the link, I will definitely keep it in mind for future aluminum tooling plate. I will certainly need more for other designs and projects. I purchase my aluminum plates from https://www.midweststeelsupply.com/store/, and have already acquired the adapter plates for this desi...
by Michael Bretti
Tue Oct 16, 2018 2:56 am
Forum: Vacuum Technology (& FAQs)
Topic: Updated Diffusion Pump Assembly and Thermal Modeling
Replies: 3
Views: 410

Re: Updated Diffusion Pump Assembly and Thermal Modeling

As mentioned in my above post, I have updated the thermal modeling of the new assembly to better understand how the system will behave thermally, and what to expect during operation for my closed-loop cooling system. A link to the project page is included below: http://appliedionsystems.com/portfoli...
by Michael Bretti
Tue Oct 16, 2018 2:40 am
Forum: Vacuum Technology (& FAQs)
Topic: Updated Diffusion Pump Assembly and Thermal Modeling
Replies: 3
Views: 410

Updated Diffusion Pump Assembly and Thermal Modeling

I have been recently working on the new designs for my vacuum system to incorporate the large 8" baffle to the EO4 diffusion pump, as well as allowing for rapid chamber changes between my three experimental setups. Below is a CAD render of the diffusion pump and baffle assembly with the adapter plat...
by Michael Bretti
Tue Oct 16, 2018 2:21 am
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 58
Views: 16343

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

As of today, the Small Scale Multipurpose V4 system design is obsolete, and I have moved to the newest V5 version update. This update is to adapt the system to the newly designed high vacuum pumping assembly and utilize the highly modular design of my pumping station to its fullest. This update allo...
by Michael Bretti
Thu Sep 20, 2018 7:21 pm
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 58
Views: 16343

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

Another quick update on the project progress so far, and the scope going forward. The cooling system is about complete and almost ready for final testing, and is currently being integrated with the new control system I am working on. The control system hardware is being assembled, and is in the proc...