Smitty Posted January 31, 2008 Report Posted January 31, 2008 I have recently gotten 2 vacuum pumps. I need to know if they will pull ABS? Piab Venturi pumps. One will pull a 1000 gallon tank to 18 inches of mercury in about 5 minutes the other will pull to 25 inches but I dont know the cfm on it. It moves close to the same amount of air as the 18 incher. I'm pretty sure that both will do the job, just wanted to check. I figure with the amount of air these things move I shouldnt even need a tank. Just let the pump maintain the vacuum on the mold till it cools. I'm pretty sure I can feed the pump with a 33 gallon air compressor. Last night I hooked a 10 gallon air pig without a compressor to the 25 incher and managed to maintain 15 inches for over a minute on the vacuum pump. Ive been over at tk560.com all night. DrCrush is awesome. Quote
john danter Posted January 31, 2008 Report Posted January 31, 2008 It greatly depends on the size of plastic you're heating and pulling dude? Plus how deep some of your moulds will be 25inHg should be fine. So go for the larger one Quote
Smitty Posted January 31, 2008 Author Report Posted January 31, 2008 (edited) Biggest thing I will pull will be on 2 ft x 4 ft sheeting. Basically just gonna use it to pull armor. Here's One--------------- Here's the other-------------------- The ML400 is the one that pulls to 18 inches. Its supposed to pull to 27 inches. I'll prolly take it apart and soak the guts in solvents and try to get that one back up to snuff. Its soiled pretty bad from use in a factory. Some of the venturies inside are probably clogged up with dried chemicals. The L100 is going somewhere special. Edited February 17, 2021 by gmrhodes13 link not working, removed gmrhodes13 2021 Quote
Marked Difference[501st] Posted January 31, 2008 Report Posted January 31, 2008 As far as the pumps go those will do just fine. The most important part is to get a good vacuum container after several failures my friend and I used a keg and it works awesome with an inferior pump to the ones you have we are able to get 30hg. We just drilled some holes in the side and welded on our piping. Having less than 1" of air pocket under your mold surface is helpful also for getting the maximum definition in your pulls. Most pro vac tables will pull 18hg to 25hg Quote
elkamino Posted January 31, 2008 Report Posted January 31, 2008 I can't say much about those pumps but 18 inches sounds a bit weak. I am using a Gast Oil less Vacuum Pump pulling 28 inches with a flow of 7 cfm. The pump itself is not enough flow so I use a 50 gallon propane tank as a vacuum chamber. Connected to my vaccum table I have dual inlets, one connected to the vacuum chamber, and the other to a 5hp shop vac. The side with the shop vac has a back-flow preventer and the vacuum chamber has a ball valve. I start the pull with the shop vac then give a quick shot from the vacuum chamber just to suck everything tight. Works like a charm. Quote
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