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Chamber wall thickness

 

Was wondering what an acceptable thickness - in steel- would be for a square welded chamber 22 inches in diameter? !/2 inch steel sound OK??
This is to coat mirrors with.

Read the archives about a formula but people didn't seem to agree on it.

Ric
 

Square chamber with diameter????? Well, anyway, if it is cylindrical chamber 1/2" SS should be OK. If it is square/cube chamber, 1/2" also should be OK but I would make stiffening plates on plane surfases (the same on the cylindrical chamber top and bottom).

Best regards,

Vladimir

On 8/14/2012 6:19 AM, radicell2 wrote:
Was wondering what an acceptable thickness - in steel- would be for a square welded chamber 22 inches in diameter? !/2 inch steel sound OK??
This is to coat mirrors with.

Read the archives about a formula but people didn't seem to agree on it.

Ric



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Yahoo! Groups Links
 

You can go thinner if you stitch weld some vertical supports across the flats.? say 1/4" wall with 1/4" thk x 1" wide support ribs perpendicular to he flat surfaces.? You are just trying to resist the inward bow of the flat plate.? The pic below is of a boat but you can see how the stringers are vertical to the surface to add support.? I suppose you could use "L" channel flipped over like this on your flat surfaces.? It would be a faster way to buidl in support than sheared plate strips.



1/2" steel is not trivial to cut and weld to shape but you may need that ( or thicker ) for the door to keep it from warping and failing the seal.? Also the end where the door will interface to the chamber has to have a serious seal landing area.?

Is there nothing out on EBAY that is close enough to buy and adapt ???

Drew in soggy Florida

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On Wed, Aug 15, 2012 at 1:16 AM, Vladimir Chutko <chutko@...> wrote:
?

Square chamber with diameter????? Well, anyway, if it is cylindrical
chamber 1/2" SS should be OK. If it is square/cube chamber, 1/2" also
should be OK but I would make stiffening plates on plane surfases (the
same on the cylindrical chamber top and bottom).

Best regards,

Vladimir



On 8/14/2012 6:19 AM, radicell2 wrote:
> Was wondering what an acceptable thickness - in steel- would be for a square welded chamber 22 inches in diameter? !/2 inch steel sound OK??
> This is to coat mirrors with.
>
> Read the archives about a formula but people didn't seem to agree on it.
>
> Ric
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
Charles Mitchard
 

heres a square chamber by James Lerch
Gomez Addams
 

Hoop stress varies dramatically with diameter, so
your thickness will depend in large part on the size
of your chamber.

This page may be informative:



Why on earth are people building chambers with flat walls?
The wall thickness has to be ENORMOUS by comparison.
Scrap gas tanks of various sizes are cheap and much lighter...

On Aug 14, 2012, at 7:19 AM, radicell2 wrote:

Was wondering what an acceptable thickness - in steel- would be for a square welded chamber 22 inches in diameter? !/2 inch steel sound OK??
This is to coat mirrors with.

Read the archives about a formula but people didn't seem to agree on it.

Ric



------------------------------------

Yahoo! Groups Links
 


That is James Lerch's box.? It is really sweet actually.? It is very stout so no need for support webbing.?

James you out there still ???? You doing mirrors or just playing with the helo's ???

Drew in soggy Florida

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On Wed, Aug 15, 2012 at 11:14 AM, Charles Mitchard <charlesmitchard@...> wrote:
?

heres a square chamber by James Lerch
Paul Anderson
 

A 22"x22"x22" cube with 1/2" thick walls will be pretty heavy. I figure it at about 400 pounds. Do you have a hoist to move it around?

--------
Paul Anderson -- VE3HOP

On 2012-08-14, at 9:19 AM, "radicell2" <radicell2@...> wrote:

Was wondering what an acceptable thickness - in steel- would be for a square welded chamber 22 inches in diameter? !/2 inch steel sound OK??
This is to coat mirrors with.

Read the archives about a formula but people didn't seem to agree on it.

Ric



------------------------------------

Yahoo! Groups Links
 

¿ªÔÆÌåÓý

Dear James

Nice vacuum box for coatings. Can let me know about the plasma cleaning. I have got the round vacuum chamber bought from the trash store. I? do not have the plasma cleaning systen in it. Can u guide me how to design this plasma cleaning (power supplies, electrode materials etc.)

What was your DC power rating for heating the tungsten wire ?

Waiting for your kind reply

zafar

To: VacuumX@...
From: eosraptor@...
Date: Wed, 15 Aug 2012 13:28:30 -0400
Subject: Re: [VacuumX] Re: Chamber wall thickness

?

That is James Lerch's box.? It is really sweet actually.? It is very stout so no need for support webbing.?

James you out there still ???? You doing mirrors or just playing with the helo's ???

Drew in soggy Florida

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On Wed, Aug 15, 2012 at 11:14 AM, Charles Mitchard <charlesmitchard@...> wrote:
?
heres a square chamber by James Lerch
 

--- In VacuumX@..., Paul Anderson <wackyvorlon@...> wrote:

A 22"x22"x22" cube with 1/2" thick walls will be pretty heavy. I figure it at about 400 pounds. Do you have a hoist to move it around?

Thanks all for the reply.

It was the "box" that James Lerch made that got me thinking on the square part plus it was home made.The 400 pounds does present a challenge,but was thinking of a side door appraoach that James also used.Had read about stiffening thinner side walls with extra weldments,so this idea might fly in the future just have to see..

Ric

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