New adventure for me, vacuum forming. I set up a test bed, a OSB wood box for the vacuum, set it on the cnc table and told it to drill me a few hundred holes, (box is bigger than the cnc stroke) so I had to move it about reorienting it.
Did a vacuum trial, a 1/2hp Gast vacuum blower versus the Supposedly 4hp 12o volt shop vac.. the shop vac won, but if it must run continuously the 3phase one will be installed. THE shop vacuum is a limited duty brush motor. Extra table holes can be covered with butchers paper, or cardboard.
FIRST trial, a slice from a blue 55 gallon plastic barrel, 1/4" or so thick, making a hammer tray for the "fanciest hammer I own". Not exactly what I wanted. I used the kitchen oven I use for powder coating to heat the piece of plastic in a wood frame, 300 degrees for about 12 minutes. It was like a wet blanket when it came out of the oven, you have about three seconds to set it onto the vacuum table, I took about ten since it was in the next room.. (so it needs a closer heat source)
It worked well enough to set up a full time vacuum table with lifts on heater and vacuum table.
Plan is the two elements tied to a SSRV (variable voltage solid state relay) in the split steel drum. Radiant heat, NO timers here, and I looked, so I had to take a old opto22 serial card, and the laptop to make a two stage event timer, one for heating time, one for pressing-vacuum time.
THE cnc shop computer can do this as well, using a usb-serial adapter, then a 232-422 current serial adapter for the antique opto22 cards. (bought off ebay cause I was familiar with them) They were going onto the beer cooker to automate it, valves and timing.. but.. it is so simple it really does not need it.
Any suggestions to make it easier? know of a real cheap cycle timer other than a brick plc??