Vacuum switch.

[echnidna]

I am toying with the idea of coverting one of the elcheapo compressors to a vacuum pump, which is mainly just simple plumbing.

Any thoughts out there about either converting the outo pressure switch or what to replace it with?

[bsrlee]

They don't work very well. The seals are designed to keep a pressure grade in one direction & vacuum pumping is the wrong direction. Harbour Freight have a venturi vacuum pump that would work off the compressor - but their shipping fees are ridiculous - $149US for 2 x $10US venturis!

I have heard of people getting reasonable results from an old fridge compressor which is easy to plumb up as a cheap sucker.

[Salty]

have a look at http://www.cloudmaker.net.au/. They have venturi systems and BIG 240v driven electric suckers - plus all the other stuff like bags, seals, gauges.

[TOMARTOM]

I use the vac clamp setup, which included the switch. from memory the switch is around $30.00

regards tony

[soundman]

compressed air to vacume venturi type devices can be baught from norgren in you state.