When oil filled rotary vane vacuumpump used a vacuum switch is a bad idea. Vacuum will go up and down, not nice for the infused part and risk of springbacks, and these pumps likes running for a long time. 12hrs is nothing for such a pump. Oil chance interval is about 500 hrs and these pumps have no problen running continuesly, in my infusions 24hours or longer.

Infusion time from valve open to valve closed: depending very much of infusion strategy, in my case about 20min. for a standard 4"x8" panel or 90min for a 40ft boat hull.

Op 24 aug. 2018 om 18:52 heeft StoneTool owly@ttc-cmc.net [harryproa] <harryproa@yahoogroups.com.au> het volgende geschreven:
The question in my mind is how long does the first phase take, where the epoxy is being drawn into the laminate out of the pot, and how long does the resin go on distributing and equalizing after the taps are closed.  The latter phase should be critical to the resulting laminate, both in strength and weight.   12 hours is a long time to run a vacuum pump......... however there is no reason not to have a reservoir and a vacuum switch so it can 

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