I agree with Trent that simplicity is the key and saves a lot of money. Make sure though the pump you buy is rated for continuous use under load.
Something you may not know, if you are into airbrushing, the pumps sold in art supply stores for this are really vacuum pumps with the hoses reversed to provide pressure for the airbrush. Might be you could have a dual purpose system already.
i have been thinking about upgrading my setup from continiouse run to the setup that you described but i am a bit confused about how you regulate the vac... it seems that for wood working they want a vac around 20" but this would crush a foam blank... so i take it you dial in the vac controller to your desired vac, but the info on the controller says it cycles based on + or - 4" of your setting. will this cause a problem with the low vac pressure used for boards? or i guess a simpler way of asking is are you using the system for boards with good results?
hey 4 est . that pump looks ok in the pic ...
whats the hourly volume ???
looks like an oil vaned pump to , so its gonna pull good vac ...
if you work on the rule of 4 m3 per hour per bag , that should give enough vac so you can use a bag with a few pinholes here and there ...
mr j was right when he said a bag with holes gives uneven pressure ...
thats where using beds and spreading the vacumn as evenly as possible with breathers can help alot ...
without them and having a leaky bag it can lead to twists , blisters in your laminate , and ugly dry spots ...
taps and gauges for pressure regulation , notice the gauges reading different pressures for different jobs ,, either that or purpose made holes in your bag ....
On Friday I just Ebayed a used vac pump: Thomas Industries Inc. The model # 2917BE22.
Decided I wated something reliable and don't have time to find/build from a fridge motor. Hoping to vac bag 2 boards as Christmas presents.
when are you going to vacuum those boards?? can I watch? are you just vacuum fiberglassing the blank or are you going to do it like bert does?
4est, good to hear you're taking the plunge!
On that note, a general note to fellow ebay'ers like myself... this comes from Joe at veneersupplies.com so he is biased 'cause he sells pumps but he's a good dude and I trust him.
"Be especially careful about pumps sold by eBay seller "jenn_bebe_24K". These pumps are repainted (not too well) and have dry rotted components. Also, most pumps have rubber gaskets, seals, and diaphragms that can dry-rot. Though a pump may look brand new, the rubber components could be rotten. A typical rebuilt kit including a new diaphragm costs $29** (not including shipping)."
** I've seen them for less... depends on the pump.
here is a sort of follow on to the cheap fridge compressor set up , it will probabaly appeal to the swaylock ingenuity and resourcefullness www.dream-models.com/eco/vacuumpump.html