Vacuum Chamber

[nimrod]

I bought on ebay a set up that can be used for vacuum or pressure, it needed some new bits and I have now got it setup. At the moment I want to use it for stabilising blanks, on test it pulls 23 inches of vacuum, is this enough or should I try a bigger pump.
Robin

 

[Jim]

That is adequate for stabilising pen blanks Robin.. Please show us your results as i and a few more on here are very interested in this project ...

 

[paulm]

I look forward with interest to seeing some results from this.

 

[turnaround360]

I like this thread well done.

 

[Grump]

Hi Robin.
Whilst a small amount of vacuum will do for stabilizing, that is more about the solution chosen and method of impregnation than force to impregnate. Click me
I am interested in your measurement process having not heard of the inches for vacuum, other than used by refrigeration engineers. The measurement of vacuum is dependant upon so many variable factors, Temperature, altitude, size of aperture all affect the viscosity of mercury and its ability to flow in the measuring device.
Also measuring devices vary from one system to another so a reliable measurement cannot be given from one device to another .
I sound like a know-it-all bugger here but I had such machinery in my old unit which was tested by MOD to over 800 psi pressure and down to 30 Mercury's vacuum.
The pressure was within an acceptable margin of tolerance but the vacuum was way offline, my equipment was measuring only 18 mercury's when theirs was measuring 30.

Deleted the rest of post cos My god did I go on and ain't I boring init?

 

[Buckeye]

It's never boring to get info you need and even if you don't need it, it's always good to learn something new.

Peter

 

[Neil]

Hi Robin.
Whilst a small amount of vacuum will do for stabilizing, that is more about the solution chosen and method of impregnation than force to impregnate. Click me
I am interested in your measurement process having not heard of the inches for vacuum, other than used by refrigeration engineers. The measurement of vacuum is dependant upon so many variable factors, Temperature, altitude, size of aperture all affect the viscosity of mercury and its ability to flow in the measuring device.
Also measuring devices vary from one system to another so a reliable measurement cannot be given from one device to another .
I sound like a know-it-all bugger here but I had such machinery in my old unit which was tested by MOD to over 800 psi pressure and down to 30 Mercury's vacuum.
The pressure was within an acceptable margin of tolerance but the vacuum was way offline, my equipment was measuring only 18 mercury's when theirs was measuring 30.

Deleted the rest of post cos My god did I go on and ain't I boring init?

Brian,

Kettles on and I've cleared up my workshop so you can actually get in it without falling over some log. Can you come over and bore me about it as I want to get a pressure/vacuum system!

 

[Grump]

I'll bring mine over and bore you at the weekend mate.
My phone is bricked at the moment wile flashing roms so email or pm me if you wanna chat init?

 

[nimrod]

Hi Grump don't know much about vacuum measurement just read the gauge which registered 23 ins-HG, hope this makes more sense to you than it does to me.
Robin

 

[Grump]

Robin you have just explained probably more than you realize.

The term, ins_HG is the old term for inches of Mercury which is still used by some folk in the ventilation and refrigeration industries,
I suggest therefore that is where your equipment originated.

Your test now would be to leave it at least overnight and see how much of an atmospheric increase you have.
This test should be timed and an allowance calculated for climate (temperature and altitude) changes, expansion and contraction of materials used.
Then a spreadsheet made up to collate this information on a calendar basis using the guidelines that In English units: 1 inHg = 0.491 098 psi, or 2.036 254 inHg = 1 psi. + or - 20%.

Over a period of time you could form a reliable gauge of measurement and reliability.

Or you could ignore all that and rest assured that what you have previously declared is allot of damn suck, believe me you wouldn't want it on the end of your vitals so don't be tempted to make love to it.
If it were controlling the brakes of Jumbo Jet you might want to get involved in the measurement of suck but for a few plastic blanks I fancy you will not be bothering.

 

[nimrod]

Grump hadn't thought about the vitals, but do you think it would have an effect on the dimensions of the vitals.
Robin

 

[Grump]

Grump hadn't thought about the vitals, but do you think it would have an effect on the dimensions of the vitals.
Robin

OOOHHH painful at your own risk dear chap.

I once had a young lad experiment with the industrial vacuum cleaner at work when I had my unit.
This happened after I had gone away for a few days on business all I found out was that he was trying to claim injury to his intestines due to my neglect for not having a sign
DO NOT SHOVE T|HIS UP OUR ARSE.

 

[nimrod]

Perhaps I will stick with what I've got.
I used to be a nurse when I was working on A&E we had a chap come in with a bottle of Old Spice in his anal orifice, said he was drying himself after he had a bath slipped and sat on it, we did think it was a bit strange he had upset baby oil on it.

 

[Neil]

Perhaps I will stick with what I've got.
I used to be a nurse when I was working on A&E we had a chap come in with a bottle of Old Spice in his anal orifice, said he was drying himself after he had a bath slipped and sat on it, we did think it was a bit strange he had upset baby oil on it.

At least it wouldn't be too bad if he farted!

 

[Jimjam66]

believe me you wouldn't want it on the end of your vitals so don't be tempted to make love to it.

Are you listening Alex? We all know you have a thing for workshop equipment ...

 

[bellringer]

Not vacuum cleaners though they are to small