Thanks for the extra pics. That definetely helps more but also raises more questions because it looks like you've changed your design since the original post. One question I've had is how thick are your lexan sheets in total? Would a half inch thick piece work? Should I get the 2.5 cfm or the 3 cfm pump from harbor freight? What is the pressure gauge for, do you keep it at a certain pressure? I'll probably have more questions when you answer these I apologize but I want to get everything covered.
I have a 1/4" sheet of lexan over about a 9-10" pot with a little bit of deflection, but not scary for lexan. 1/2" would be plenty and is what I would use next time.
My automotive gauges say I get to about 27. Do the last two make a big difference? It seems to really start expanding up towards my indicated 27, but I could see two more inches making even more difference.
I think if I ditch my regulator on the output of my compressor I may be able to get another inch.
Edit : isn't something like 29.9" a perfect vacuum? Like really hard to achieve?
This is such a great post! Glab 120 i don't mean to use your page to contact grey wolf but Ive been trying to contact you (greywolf) for a year now. just now came across this page and became a member today. Already started making this setup! Can't wait to give it its first run! But grey wolf, much honor in finally meeting you. I have many questions for you! What's the best way to contact you besides using up glams great forum?A point to consider, is that bourdon gauges change their zero with use and require regular recalibration. Usually the face of the gauge comes off and there is an adjustment screw for setting zero. When first breaking them in, I have had expensive gauges change their zero as much as two 2" Hg.
So according to your math since I'm at 5420 feet a full vac for me would be 24.5? That seems kind of low but I believe you. What type of glue did you use for the rubber gasket, I would assume it's somewhat heat resistant. With that in mind, do you actually need to glue it or can you just set it between the pot and the lexan?
Also any advice to where to find the Hg gauges your using would be much appreciated as well. I'm finding them on amazon but most are psi guages are they the same thing?
ran my first vacuum purge with my harbor freight pump and Belart desiccator last night. was only able to hit 26in hg tho...
possible reasons to why I think I couldnt reach a full vacuum:
-too skinny of a tube. I used a 1/4" tube to connect directly from my pump to desiccator.
-leak from the desiccator stopcock
-leak from the pump because the barb im using doesnt fit the pump perfectly.
-too weak of a pump...
all in all, Im happy with how clean (of butane) my product is. Its alot more sappy and sticky because I didnt use nearly as much heat as i usually do. Im probably gonna convert it to budder tho because I dont like the mess oil makes and I like dunking my dabs onto my nail..
P.S. probably gonna return this pump and order a nice single stage on amazon
ran my first vacuum purge with my harbor freight pump and Belart desiccator last night. was only able to hit 26in hg tho...
possible reasons to why I think I couldnt reach a full vacuum:
-too skinny of a tube. I used a 1/4" tube to connect directly from my pump to desiccator.
-leak from the desiccator stopcock
-leak from the pump because the barb im using doesnt fit the pump perfectly.
-too weak of a pump...
all in all, Im happy with how clean (of butane) my product is. Its alot more sappy and sticky because I didnt use nearly as much heat as i usually do. Im probably gonna convert it to budder tho because I dont like the mess oil makes and I like dunking my dabs onto my nail..
P.S. probably gonna return this pump and order a nice single stage on amazon
This is such a great post! Glab 120 i don't mean to use your page to contact grey wolf but Ive been trying to contact you (greywolf) for a year now. just now came across this page and became a member today. Already started making this setup! Can't wait to give it its first run! But grey wolf, much honor in finally meeting you. I have many questions for you! What's the best way to contact you besides using up glams great forum?
i could be wrong about how much elavation will affect the vac pressure, i heard this from a friend who lives about 3000 feet up (he could be full of shit). but it does make sense cuz the air gets thiner the higher up u go, any ways i live about 20 feet away from the ocean so this doesn't affect me. as far as the rubber mat i did glue mine on with spray adhesive but it probably wasn't necessary. and the gauges are a little tricky to find, mine came off of a handheld mightyvac brake bleeder, u can usually find these at a auto parts store for about $20
Here is a good site with the answers: http://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html
Is that the single stage pump from harbor freight? I don't remember where, but I remember reading somewhere that people were reaching full vac with the single stage vs the dual stage pumps from HF. I think I'm gonna go and exchange it for the single stage.
sry i haven't responded sooner but hopefully i can help yall a little. getting the 1/4 inch barbs into the lexan is probably the hardest part, i just pre drilled the holes then screwed the barbs in(easier said than done) but thats all i did.
the 1/4 inch hose that connects to the pump is from an automotive A/C recharging can thats sold at any auto parts store for under $20. i use two 1/4 inch ball valves to regulate pressure and to isolate the chamber from the pump while its not running(this also prevents the oil in the vac pump form being sucked into the chamber, believe me this sucks!!) all the other hoses are just regular 1/4 inch air lines.
hopefully these pics help.View attachment 287586View attachment 287587View attachment 287588View attachment 287589View attachment 287590View attachment 287591
Is that the single stage pump from harbor freight? I don't remember where, but I remember reading somewhere that people were reaching full vac with the single stage vs the dual stage pumps from HF. I think I'm gonna go and exchange it for the single stage.
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