Sloan Deposition Controller
Drew,
I've been lurking in the Vacuum-X group for a few years; I have an old (like nice wood case old) Sloan Omni II Deposition Control Master + Sloan SCR 7.5 (35A) that are about to hit the dust bin if I don't find them a new home. The Omni II reads a QCM and controls based on frequency shift. You have to do the conversion to rate yourself but has the ability to adjust power based on frequency shift for rate feedback (it has audible feedback that sounds a bit like a theremin which will be missed in the lab). This thing works but we're replacing it with a Sycon STM-2.
I also have a whole bunch of tungsten coil baskets up for grabs as well. We're moving our shop so I'm thinking if you cover shipping their yours.
If you're interested, or can suggest someone on the group who might put it to good use, please let me know.
Best regards,
Dave
Senior Research Engineer
Luxel Corp.
www.luxel.com
A good politician is like a good football coach. He has to be smart enough to do a good job but dumb enough to think it matters
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Attila,
This may be old to everybody else but could you explain the IBAD you have.? Is it for aluminization or SiO overcoating or both ???? I understand tungsten coil evaporation process very well but not the others.? How you power that sort of process is what I really want to know.?
Thanks in advance.
Drew in sunny Florida
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On Tue, Nov 27, 2012 at 1:46 PM, Attila <schneyolo@...> wrote:
?
Hi Alex,
I can explain only my experience. Actually I don't use those baffles.
Because I do IBAD coating for mirrors. During this process my ion gun needs gas flow to work properly. To maintain a working pressure I need as much pumping speed as possible. Those baffles, at least what I own, reducing the pumping speed to 50-60% of the original. This is not acceptable for me.
So if you need a clean low vacuum you should use those baffles. If you need to maintain a working pressure(tipically 1-5x10-4 Torr), you need high pumping speed instead.
Br.
Attila
--- In VacuumX@..., "grossmann200" wrote:
>
> Based on the pictures uploaded by David and Attila (thank you both!), it is pretty obvious, that the baffle has quite some complexity. Most likely, a baffle maybe not so easy to build on your own.
>
> So, there is the question:
> - In which (coating-) situation do you really need a baffle?
> Or to ask the way around: when would I not need such a baffle?
>
> Cheers
> Alexander
>
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Hi Alex,
I can explain only my experience. Actually I don't use those baffles.
Because I do IBAD coating for mirrors. During this process my ion gun needs gas flow to work properly. To maintain a working pressure I need as much pumping speed as possible. Those baffles, at least what I own, reducing the pumping speed to 50-60% of the original. This is not acceptable for me.
So if you need a clean low vacuum you should use those baffles. If you need to maintain a working pressure(tipically 1-5x10-4 Torr), you need high pumping speed instead.
Br.
Attila
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--- In VacuumX@..., "grossmann200" <email@...> wrote:
Based on the pictures uploaded by David and Attila (thank you both!), it is pretty obvious, that the baffle has quite some complexity. Most likely, a baffle maybe not so easy to build on your own.
So, there is the question:
- In which (coating-) situation do you really need a baffle?
Or to ask the way around: when would I not need such a baffle?
Cheers
Alexander
|
Based on the pictures uploaded by David and Attila (thank you both!), it is pretty obvious, that the baffle has quite some complexity. Most likely, a baffle maybe not so easy to build on your own.
So, there is the question:
- In which (coating-) situation do you really need a baffle?
Or to ask the way around: when would I not need such a baffle?
Cheers
Alexander
|
Attila,
thanks for uploading the photo. This helps me a lot to understand the baffle in a much better way!
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Hi David,
thanks for uploading the photo.
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Hi Alex,
I put 3 photos to the Baffle photo album. The Balzers baffle is a 50 years old construction made out of brass. The Tesla baffle is 30 years construction made out of copper. Both are water cooled. The Balzers baffle reduces de pumping speed to 50%. About the Tesla I have no datas.
Attila
www.ebeamguns.com
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--- In VacuumX@..., "grossmann200" <email@...> wrote:
Hi everybody,
I'm a new guy in the group. I joint this, because I have serious plans to build my own vacuum-chamber (10E-5 to 10E-7 mBar).
I decided to go with a diffusion pump and a system as already decribed by "atm_ken_hunter" under the "Files" section in this group.
Following link shows a screenshot of the basic concept I want to build (taken out from the File posted by "atm_ken_hunter"):
In that concept a "baffle" is indicated. I wonder, how such a "baffle" looks like, how complicated it is, how it works and functions etc.
I am even more curious about that "baffle" because in Ebay is an auction, where somebody points out, that he is selling a diffusion pump together with a "baffle" and that the "baffle" alone would already costs 2000.- Euro (approx. 2500.- US$ !!!).
Wow, something that expensive was not on my bill-of-material list so far.
Where can I learn more about "baffles", their function and design, and how to get a or build a "cheap" one.
Thanks everybody for your support.
Cheers
Alexander
|
I've uploaded pictures of a baffle we recently took off a system (http://groups.yahoo.com/group/VacuumX/photos/album/1665179354/pic/list). There's a disk with an elliptical cross section (think flying saucer) suspended in the middle of the fitting by four tubes (two on the bottom, two on the top). The baffle is water cooled and I suspect the water flows both through a water jacket on the outside as well as through the disk in the middle. No idea of the structure inside of the baffle portion but it has a pretty thin wall. So there's a bit more to these than the name would imply. ? David A. Grove Luxel Corp. ? A good politician is like a good football coach. He has to be smart enough to do a good job but dumb enough to think it matters. ?
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From: VacuumX@... [mailto:VacuumX@...] On Behalf Of grossmann200
Sent: Monday, November 19, 2012 7:08 AM
To: VacuumX@...
Subject: [VacuumX] Re: Baffle design? ? Hey gentleman,
I mean it is nice that you all are taking your time to give me a reply .... but ... well ... did anybody read my question? :-)
--- In VacuumX@..., Guy Brandenburg >
> What's it like when you put the pumpkin into the vacuum chamber? ;-}
> ??
> Guy Brandenburg, Washington, DC??
>
>
> ============================
>
>
> ________________________________
> From: jlcampll
> To: VacuumX@...
> Sent: Sunday, November 18, 2012 5:41 PM
> Subject: Re: [VacuumX] Baffle design [2 Attachments]
>
>
> ??
> [Attachment(s) from jlcampll included below]
> I have an entire Veeco VE400 system that I could do without. ??It has I believe a 4" diff pump, cryo pump and everything you need. ??The chamber ia 18"X 29" pyrex with lifter. ??There is also a HV supply, ion and TC guages and 200Amp filament supply. ??It all works.
> jlcampll@...
>
|
Re: Baffle design [2 Attachments]
Hey gentleman,
I mean it is nice that you all are taking your time to give me a reply .... but ... well ... did anybody read my question? :-)
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--- In VacuumX@..., Guy Brandenburg <gfbrandenburg@...> wrote:
What's it like when you put the pumpkin into the vacuum chamber? ;-}
??
Guy Brandenburg, Washington, DC??
============================
________________________________
From: jlcampll <jlcampll@...>
To: VacuumX@...
Sent: Sunday, November 18, 2012 5:41 PM
Subject: Re: [VacuumX] Baffle design [2 Attachments]
??
[Attachment(s) from jlcampll included below]
I have an entire Veeco VE400 system that I could do without. ??It has I believe a 4" diff pump, cryo pump and everything you need. ??The chamber ia 18"X 29" pyrex with lifter. ??There is also a HV supply, ion and TC guages and 200Amp filament supply. ??It all works.
jlcampll@...
|
Re: Baffle design [2 Attachments]
What's it like when you put the pumpkin into the vacuum chamber? ;-} ? Guy Brandenburg, Washington, DC?
http://gfbrandenburg.wordpress.com/
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
============================
From: jlcampll
To: VacuumX@...
Sent: Sunday, November 18, 2012 5:41 PM
Subject: Re: [VacuumX] Baffle design [2 Attachments]
?
I have an entire Veeco VE400 system that I could do without. ?It has I believe a 4" diff pump, cryo pump and everything you need. ?The chamber ia 18"X 29" pyrex with lifter. ?There is also a HV supply, ion and TC guages and 200Amp filament supply. ?It all works. jlcampll@...
|
I have an entire Veeco VE400 system that I could do without. ?It has I believe a 4" diff pump, cryo pump and everything you need. ?The chamber ia 18"X 29" pyrex with lifter. ?There is also a HV supply, ion and TC guages and 200Amp filament supply. ?It all works. jlcampll@...
From my Android phone on T-Mobile. The first nationwide 4G network. Andrew Aurigema <eosraptor@...> wrote:
?
I have a 4" diff pump with 4" gate valve and 4" baffle for sale........ $1500 for it all.? Contact me off list if you want details.?
Drew in sunny Florida
---------------------------------------------------------------------------------?
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On Sat, Nov 17, 2012 at 5:35 AM, grossmann200 <email@...> wrote:
?
Hi everybody,
I'm a new guy in the group. I joint this, because I have serious plans to build my own vacuum-chamber (10E-5 to 10E-7 mBar).
I decided to go with a diffusion pump and a system as already decribed by "atm_ken_hunter" under the "Files" section in this group.
Following link shows a screenshot of the basic concept I want to build (taken out from the File posted by "atm_ken_hunter"):
In that concept a "baffle" is indicated. I wonder, how such a "baffle" looks like, how complicated it is, how it works and functions etc.
I am even more curious about that "baffle" because in Ebay is an auction, where somebody points out, that he is selling a diffusion pump together with a "baffle" and that the "baffle" alone would already costs 2000.- Euro (approx. 2500.- US$ !!!).
Wow, something that expensive was not on my bill-of-material list so far.
Where can I learn more about "baffles", their function and design, and how to get a or build a "cheap" one.
Thanks everybody for your support.
Cheers
Alexander
|
?????
??????????????????? Hi to everybody,
?
??????? Does anybody from the group knows how much will cost to build one mirror coating vacuum chamber?machine?which can handle maximum 24" telescope mirror blanks? The parts can be bought lets say some?used if availible from E-bay or other companies which offer them and some new if it is better to be new than used. I think I should be able to do all the work to build it and of course with some help from the local shops. The coating machine should not be state of the art, but also not to give low quality of the coatings.?I am interested to get good quality coatings for reasonable price.
?
Thanks to everybody, Zoran?
|
--- On Sun, 11/18/12, Andrew Aurigema wrote:
From: Andrew Aurigema
Subject: Re: [VacuumX] Baffle design
To: VacuumX@...
Received: Sunday, November 18, 2012, 10:35 AM
?
I have a 4" diff pump with 4" gate valve and 4" baffle for sale........ $1500 for it all.? Contact me off list if you want details.? Drew in sunny Florida ---------------------------------------------------------------------------------?
On Sat, Nov 17, 2012 at 5:35 AM, grossmann200 <> wrote:
?
Hi everybody,
I'm a new guy in the group. I joint this, because I have serious plans to build my own vacuum-chamber (10E-5 to 10E-7 mBar).
I decided to go with a diffusion pump and a system as already decribed by "atm_ken_hunter" under the "Files" section in this group.
Following link shows a screenshot of the basic concept I want to build (taken out from the File posted by "atm_ken_hunter"):
In that concept a "baffle" is indicated. I wonder, how such a "baffle" looks like, how complicated it is, how it works and functions etc.
I am even more curious about that "baffle" because in Ebay is an auction, where somebody points out, that he is
selling a diffusion pump together with a "baffle" and that the "baffle" alone would already costs 2000.- Euro (approx. 2500.- US$ !!!).
Wow, something that expensive was not on my bill-of-material list so far.
Where can I learn more about "baffles", their function and design, and how to get a or build a "cheap" one.
Thanks everybody for your support.
Cheers
Alexander
|
I have a 4" diff pump with 4" gate valve and 4" baffle for sale........ $1500 for it all.? Contact me off list if you want details.?
Drew in sunny Florida
---------------------------------------------------------------------------------?
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Show quoted text
On Sat, Nov 17, 2012 at 5:35 AM, grossmann200 <email@...> wrote:
?
Hi everybody,
I'm a new guy in the group. I joint this, because I have serious plans to build my own vacuum-chamber (10E-5 to 10E-7 mBar).
I decided to go with a diffusion pump and a system as already decribed by "atm_ken_hunter" under the "Files" section in this group.
Following link shows a screenshot of the basic concept I want to build (taken out from the File posted by "atm_ken_hunter"):
In that concept a "baffle" is indicated. I wonder, how such a "baffle" looks like, how complicated it is, how it works and functions etc.
I am even more curious about that "baffle" because in Ebay is an auction, where somebody points out, that he is selling a diffusion pump together with a "baffle" and that the "baffle" alone would already costs 2000.- Euro (approx. 2500.- US$ !!!).
Wow, something that expensive was not on my bill-of-material list so far.
Where can I learn more about "baffles", their function and design, and how to get a or build a "cheap" one.
Thanks everybody for your support.
Cheers
Alexander
|
Hi everybody,
I'm a new guy in the group. I joint this, because I have serious plans to build my own vacuum-chamber (10E-5 to 10E-7 mBar).
I decided to go with a diffusion pump and a system as already decribed by "atm_ken_hunter" under the "Files" section in this group.
Following link shows a screenshot of the basic concept I want to build (taken out from the File posted by "atm_ken_hunter"):
In that concept a "baffle" is indicated. I wonder, how such a "baffle" looks like, how complicated it is, how it works and functions etc.
I am even more curious about that "baffle" because in Ebay is an auction, where somebody points out, that he is selling a diffusion pump together with a "baffle" and that the "baffle" alone would already costs 2000.- Euro (approx. 2500.- US$ !!!).
Wow, something that expensive was not on my bill-of-material list so far.
Where can I learn more about "baffles", their function and design, and how to get a or build a "cheap" one.
Thanks everybody for your support.
Cheers
Alexander
|
Hey guys,
Here is my latest addition to "baby George".?
I melted the previous high amp pass thru by putting way to much current thru it.? The previous unit was made of 9 each 1/4" bolts passing thru Scotch Weld 2216 epoxy.? Turns out 1/4" rods are rated for about 120 amps at best and when you pass 360 amps thru them they get really hot.? I guess I missed the part about serial current being less than parallel current.? Who knew that 90 amps x 12 volts is not the same thing as 360 amps at 3 volts.? It was all bad from there. ? But I choose to move on and not live in the past.
The new pass thru's (now there are 2 of them) are made with 3/8" rods.? The epoxy and 1/2" thick acrylic spacer plate are the same.? I once again discovered that 1/8" o-rings in square o-ring grooves are the answer to making vacuum tight seals.? Note that 1/4" o-rings in curved grooves are not the answer to anything.?
Just thought you would like to see a poor boy's solution to high amperage pass thru of the chamber wall.? The 360 amps is needed for the 4 each tungsten emitters in parallel.? With 9 separate coil stations I need 9 separate pass thru.? I do the switching outside the chamber and feed the full current to each quad emitter station.? It is a rats nest of fiberglass sock shielded welding cable inside the chamber but them tungsten coils do get hot quick now.? No more waiting for the the slow coil to heat up.? They all get to hot fast and I am no where near the edge of the 12kw supply.?
Drew in sunny Florida
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Re: looking for a suggestion on small chamber
Sorry I didn't get to this sooner (my
year end finals start Monday)....
You want the edge to be proud enough to keep the O-ring from
catching on the lip, but also such that there is room to give the
O-ring a good squeeze. (they don't need to meet, but they will as
you pump down anyway)
If you feel the need, and have a lathe or mill big enough then a
groove to secure the O-ring won't go astray, but I have a bell jar
(16" ID x 25" tall) that has the lip ~3/8" high before the flange,
I use a 1/2" thick viton O-ring, I tighten down till I can
anymore, but after pump down the lock downs are all lightly loose
anyway.
Thomas.
On 21/10/2012 4:32 AM, Russ Thornton wrote:
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?
Thomas,
Another question occurred to me. ?Do
you design the O-ring size and proudness of the
wall(s) so that there is a gap between the top and
bottom wall or do you?squeeze?the flanges until the wall edges touch?
Thanks,
Russ
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Re: looking for a suggestion on small chamber
Hi Russell,
You'd need to put a flange on both halves and then clamp an O-ring
between them, Weld them on a touch below the lip so that the
O-ring actually seats against the wall and not the flange (the
flange is the back stop, the seal surface is the wall). Kind a
like =| where the seam and the O-ring both are found between the
horizontals of the equals sign if that makes sense?
You can then clamp the halves together either with C clamps or a
bolt together system as you wish. Keep the seal surfaces REALLY
clean and shiny and you should get a good seal. Though you may
need to tinker with the idea a bit for optimal results.
Cheers, Thomas.
On 18/10/2012 5:33 PM, Rocky_Beech wrote:
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?
I have several A/C compressor housings out back and it
occurred to me that if I could cut them in half a make a
good seal they would make a good chamber. Does anyone have
any suggestions on how to make a sealing surface after I
cut them in half at the equator?
Russell
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Re: looking for a suggestion on small chamber
Thomas, Another question occurred to me. ?Do you design the O-ring size and proudness of the wall(s) so that there is a gap between the top and bottom wall or do you?squeeze?the flanges until the wall edges touch? Thanks, Russ
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Re: looking for a suggestion on small chamber
Thanks, Thomas. ?I was thinking about the flange but was going to make the wall flush. Glad you mentioned that. ?Now does one leave the wall proud on both the top and bottom section such that the flanges won't close all the way? ?If so then I am guessing that the O-ring will get crushed. No need to make a groove for the O-ring? Thanks again, Russell
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Dave