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 Post subject: Re: Vacuum pump switch
PostPosted: Wed May 28, 2014 5:41 pm 
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Joined: Sun Feb 24, 2008 6:15 pm
Posts: 337
Location: France
Very low teck but I have made quite a few foil wings with this and it seems ok.
A syringe with a spring inside adjustable with hose clamps.
the switch is just a spring loaded on, off push in=on out=off
When enough vacume is got the plunger pulls away from the switch and turns off the pump.
When vacume is lost or low the spring presess the plunger against the switch turning it on.
Easy to build, super cheap, a fairly high level of adjustability by sliding the caes of the syring either closer or farther away from switch.
The best idea I have found for vac sacking is to have an in line tank that also has vacume so when you open up at your part it sucks alot to start.
I once adjusted to high and the part was to dry, so I go for about half a bar now.
Just an idea.
R H
Attachment:
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 Post subject: Re: Vacuum pump switch
PostPosted: Thu Jul 24, 2014 11:59 pm 
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Joined: Thu Jul 24, 2014 10:42 pm
Posts: 13
Location: Portugal
revhed,

That was a great idea! That is my type of home engineering :thumb: ! Cheap and simple!
I just think that is a shame that no one congratulate you before for this wonderful work and for the share.
I will apply this system to my "freezer bomb". Could you just share a few more photos from different angles?

Best regards,
Brainsold


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 Post subject: Re: Vacuum pump switch
PostPosted: Fri Jul 25, 2014 3:34 pm 
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Joined: Wed Jan 01, 2014 9:15 pm
Posts: 192
BRAINSOLD wrote:
revhed,

That was a great idea! That is my type of home engineering :thumb: ! Cheap and simple!
I just think that is a shame that no one congratulate you before for this wonderful work and for the share.
I will apply this system to my "freezer bomb". Could you just share a few more photos from different angles?

Best regards,
Brainsold


It's definitely a cool idea, and something I had considered. My only issue is I wanted hysterisis, and didn't want quick cycling.


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 Post subject: Re: Vacuum pump switch
PostPosted: Fri Jul 25, 2014 8:24 pm 
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Joined: Thu Jul 24, 2014 10:42 pm
Posts: 13
Location: Portugal
Ok, so lets use this system but instead the switch (that power on and off the motor) lets just use a cap that allow the air enter to the system! So the motor will work all day, but when the needle reach the exact value will pull an air cap. That way you will have a constancy in the entire pump system.
What do you think?

Best regards,
Brainsold


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 Post subject: Re: Vacuum pump switch
PostPosted: Thu Jul 31, 2014 7:27 pm 
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Joined: Sun Sep 04, 2011 5:37 pm
Posts: 1793
BRAINSOLD wrote:
...
So the motor will work all day, ...
What do you think?

Best regards,
Brainsold


Not sure i would Want my motor running all day ; i use this system
and it works well.

http://www.acpsales.com/Vacuum-Switch-3 ... Range.html

http://www.acpsales.com/Relay-for-Vacuum-Switch.html

The relay can also be had at radio-Shack for cheap . I use a Beer-Keg
for a holding tank. If the bag is sealed properly ; the motor comes on
once an hour for a few minutes. The switch activates when vacuum falls 3-Hg
below what you set .

The Bigger the holding tank ; the Less the system runs . A 60-gal tank would
work best ; especially for finding the leaks on start-up, and getting the bag
to inicially close.

I use an , "FREE" pump from a tossed-out refrigerator ; found it on the curb
on trash-day.

Bille


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 Post subject: Re: Vacuum pump switch
PostPosted: Sat Aug 02, 2014 9:56 am 
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Joined: Mon Jul 01, 2013 7:16 am
Posts: 336
Location: Perth, Australia
^^

Agreed. Do good for this Planet.

The beauty of a bigger keg is it can be converted into the Spray gun air container as well. Very quiet compressor:)

Good luck.


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 Post subject: Re: Vacuum pump switch
PostPosted: Sat Aug 02, 2014 12:03 pm 
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Joined: Sat Aug 29, 2009 11:25 pm
Posts: 2762
Location: The Naki
Here's my fridge pump set up. The lpg bottle is just a resiviour to help initial suck down and slow the rate at which the switch switches on and off.

Attachment:
10446696_664461880294859_492350605125982661_n.jpg
10446696_664461880294859_492350605125982661_n.jpg [ 58.23 KIB | Viewed 508 times ]


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 Post subject: Re: Vacuum pump switch
PostPosted: Tue Nov 04, 2014 11:00 pm 
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Joined: Sun Feb 24, 2008 6:15 pm
Posts: 337
Location: France
A reservior is almost needed for good 1st vac application. I have to think that a big volume inital suck is good. :thumb:
I learned the hard way that to much vacume is NOT good. I sucked out to much epoxy going to 1 bar.
The part came out to dry and was to weak to use. waste of carbon and epoxy :(
Now I go to a half bar and seems to work better.
R H
I can not take credit for the syringe spring on, off vac switch, I found it on line somewhere, so credit goes there, I simply wanted to share a good idea..


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 Post subject: Re: Vacuum pump switch
PostPosted: Wed Nov 05, 2014 6:11 pm 
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Joined: Wed Sep 10, 2008 3:44 am
Posts: 9
Hi,

I don't get the reason why you are using a switch at all. I am building bidies for more then a decade now, with mold injection. And the last thing I would do is switching the vakuum on/off. Maybe you can explain what the reason is.
Sorry for my english, not my native language.

By the way I have started to build a complete set of molds for a foil. Board - wings - fusalage. Lot's of fun so far.

tks

kosta


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 Post subject: Re: Vacuum pump switch
PostPosted: Wed Nov 05, 2014 7:12 pm 
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Joined: Sat Aug 29, 2009 11:25 pm
Posts: 2762
Location: The Naki
For many of us using a cheap homemade set up running the little fridge pump for a full 24hrs while the work cures may cause it to overheat and fail. Having the pump turn on and off at acceptable vacuums saves the pump and means less chance of failure during lay up.

PS The average home set up is a wet layup with vac bagging. Not a resin infusion.


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