Vacuum Chamber

MaryJaneAdvocate

MaryJaneAdvocate

Active Member
Hey guys,

I did a quick search and found little about different vacuum pressures.

I found a Vac chamber on ebay by best value vacs that is rated up to -29hg and 110*. Would this be a total waste of money? I notice a lot of you use chambers at -30hg when vac purging.
 
Fadedawg

Fadedawg

Well-Known Member
MaryJaneAdvocate said:
Hey guys,

I did a quick search and found little about different vacuum pressures.

I found a Vac chamber on ebay by best value vacs that is rated up to -29hg and 110*. Would this be a total waste of money? I notice a lot of you use chambers at -30hg when vac purging.
Click to expand...
There are lies, damn lies, and statistics. It is just a play on truncating the last decimal.

There are only 29.92" of Hg at sea level, under standard conditions. Both pots are capable of -29.92", one is just rounded up and other down.
 
MaryJaneAdvocate

MaryJaneAdvocate

Active Member
So they are okay to use with wax? I'm not going to break it the first time, lol? What about the Temp, 110 seems pretty low eh? I'm just afraid to drop 150 on an inferior product that can't be used the way we use them.
 
Sirdabsalot462

Sirdabsalot462

Well-Known Member
Best Value Vacs are quickly taking over as the chamber of choice for the extractor that isn't loaded with plenty of extra cash.

I've got 3 different friends that are loving their” Best Value Vac”
I would suggest going to their website and ordering directly from the manufacturer, as opposed to E bay.

Great customer service.

And what FD said^
 
Fadedawg

Fadedawg

Well-Known Member
MaryJaneAdvocate said:
Thanks guys I appreciate it! So I really shouldn't worry about these guys saying it can't go over 110* and under -29hg.
Click to expand...
That is a different issue. It isn't the difference between 29 and 30 inches, it is how heavy the components are.

The can looks OK at 110F and above, but the weak link is the lid. It doesn't reveal how thick the lid is, or whether it is Polycarbonate or Acrylic, so it isn't possible to tell how much deflection occurs.

The issue isn't whether it could achieve full vacuum at 110F and above, it is how long before the high cyclic fatigue causes the lid to implode.
 
lio lacidem

lio lacidem

Well-Known Member
I just got the best value 3 gallon chamber and 3cfm pump. The lid is 3/4 inch thick acrylic. Hows that gonna work pasy 110 fade?
 
Fadedawg

Fadedawg

Well-Known Member
lio lacidem said:
I just got the best value 3 gallon chamber and 3cfm pump. The lid is 3/4 inch thick acrylic. Hows that gonna work pasy 110 fade?
Click to expand...
Not well. Too much deflection at 3/4". With continued use the lid will most likely develop stress cracks from high cyclic fatigue and eventually implode.
 
MaryJaneAdvocate

MaryJaneAdvocate

Active Member
I did notice they sell individual parts as well. I could see the acrylic imploding after multiple uses. Wear and tear is hell, but it is cheeeeeap. I would snag one for the mind to be at ease with a vac, but I just can't pull he trigger. I have been thinking about it... still thinking haha.
 
Fadedawg

Fadedawg

Well-Known Member
MaryJaneAdvocate said:
I did notice they sell individual parts as well. I could see the acrylic imploding after multiple uses. Wear and tear is hell, but it is cheeeeeap. I would snag one for the mind to be at ease with a vac, but I just can't pull he trigger. I have been thinking about it... still thinking haha.
Click to expand...
I picked up some scrap 2 1/2" polycarbonate at Multi Craft Plastics at $2/lb and made my own lids.
 
blackforest

blackforest

Well-Known Member
Twitch. said:
i might have to splurge and get a vac oven... those are pretty cool
Click to expand...
I've been looking for quite some time. I like the fact you can set your temps precisely. Looks like I'll need just over $1G. Some neat videos on youtube showing the purge in action. Although a good metal chamber over a griddle is pretty much the same thing, a vac over sure does look cool! ;)
 
Sirdabsalot462

Sirdabsalot462

Well-Known Member
Man, an oven would be awesome.

I have to admit, I'm an addict ..

Addicted to pulling muffins watching them rise and fall and playing with levels of vacuum.

Even with my super super cheap griddle ($16) , and a bag of sand (3.50$ for a 50 lb bag)
I can change my temps very accurately within +/- 1°

I do this by filling my deep dish griddle with the sand, then turn the rheostat to” warm”
Place chamber in griddle, add more sand around the bottom and up the walls of the chamber.

I take a digital food thermometer and place in sand touching the bottom of my chamber.
That readout tells me of I need to adjust the rheostat a cm lower our higher.
133° on that readout is 115° oil surface.

By manipulating the rheostat and reading digital temp I can hit 110,111,112, etc..

But if I had the extra cash, OVEN ALL DAY, FOR THE WIN!!
Vac oven FTW
 
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