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My LOW budget Vacuum Switch

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Old 03-17-2018, 07:23 AM
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Vettster
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Default My LOW budget Vacuum Switch

Just thought I'd post this here in the hopes it may help other builders entering composites fabrication. I can't take credit for the idea. I found a picture on the net with no info, but that was all I needed. It works very good and is KISS! Keep It Simple Stupid

I'm getting pretty good at the bagging with regards to a perfect seal.. though I still have to occasionally check it and give it a pump once or twice. It's kinda nerve racking when you're trying to relax and watch a movie etc, so I decided to use a switch. I didn't want to go with the expensive electronic switches that you can only get from the US and pay a fortune in shipping + duties, taxes and waiting for a week or more...so I made my own for $5. That was the cost of the 15a 125v switch.

The syringe has a spring inside. When vacuum hits 8 bar the spring is compressed releasing the switch and turning off the pump. When/if it loses vac (5 bar)the spring pushes the plunger out which activates the switch starting the cycle again.

The only tricky part was the switch. I don't have a lot of experience with electronics, but I knew that I didn't want the switch to turn on or off so slowly that it would arc and burn out the switch. A simple chat with the electronics salesman set me up with what is called a "momentary quick switch". It builds up pressure and then snaps to the on position and same for the off.

Hope this helps someone.

Trevor

Last edited by Vettster; 03-17-2018 at 07:26 AM.
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Old 05-27-2018, 02:58 PM
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giantfly
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Smile low budget vacuum switch

very cool idea I am going to build one myself
thanks for sharing
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Old 05-27-2018, 03:32 PM
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Your welcome. The only thing I would change is to use a 20ml syringe instead of the 10ml syringe I used. The small one is a bit to sensitive.

Have fun!
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Old 05-30-2018, 06:21 AM
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j.duncker
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I built my own rig.some time back. For a cheap pressure sensitive switch I scavenged the vacuum advance unit off an automobile distributor. They come with a spring. built in.

I reused a micro switch and a relay from my junk box. The vacuum advance unit was a spare I had for my classic car as the diaphragms do fail

Last edited by j.duncker; 05-30-2018 at 06:25 AM.
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