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Author: Subject: Creating vacuum from pressure
tegwin

posted on 13/5/13 at 03:05 PM Reply With Quote
Creating vacuum from pressure

Any cunning folk ever seen a device that enables you to convert compressed air (from a compressor) into vacuum?

I need to do some manual pick and place so need a very small amount of vacuum to pick components up... Only issue is I don't have a pump and don't want to pay big bucks for one...


I know it will be inefficient converting pressure to vacuum but it must be possible!?





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liam.mccaffrey

posted on 13/5/13 at 03:12 PM Reply With Quote
search for vacuum generators

HTH





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sprouts-car

posted on 13/5/13 at 03:14 PM Reply With Quote
what about something like this?

18"'HG 12V DC Vacuum Pump → Hobby Lab Projects Wet or Dry | eBay

[Edited on 13/5/13 by sprouts-car]





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hughpinder

posted on 13/5/13 at 03:27 PM Reply With Quote
Isn't that how a spray gun/sand blaster picks up the paint/sand? If your need is 'small' enough you may be able to adapt one of those? (Or pinch the hoover)
Regards
Hugh

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tilly819

posted on 13/5/13 at 03:30 PM Reply With Quote
Venturi Principle

Tilly

[Edited on 13/5/13 by tilly819]





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owelly

posted on 13/5/13 at 03:48 PM Reply With Quote
http://pages.ebay.com/link/?nav=item.view&id=110693154237





http://www.ppcmag.co.uk

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matt_gsxr

posted on 13/5/13 at 04:15 PM Reply With Quote
http://www.vaccon.com/Venturi-vacuum-pumps.aspx
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John P

posted on 13/5/13 at 04:18 PM Reply With Quote
Used these in the past. Good but noisy.

http://www.brauer.co.uk/aluminium-alloy-adjustable-airmovers-s264.aspx

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Phil.J

posted on 13/5/13 at 04:40 PM Reply With Quote
Many years ago you could buy a car vacuum cleaner that ran from the exhaust tailpipe, working on the venturi principle.
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robocog

posted on 13/5/13 at 05:42 PM Reply With Quote
I looked into it and gathered some simple plans with rough dimensions for building a suitable venturi for use with an air comressor
My idea was to build something to assist with brake bleeding/oil extraction ...that kind of thing


Buggered if I can find the info now..

Will keep looking as I know I have them here somewhere

Regards
Rob

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britishtrident

posted on 13/5/13 at 05:44 PM Reply With Quote
quote:
Originally posted by Phil.J
Many years ago you could buy a car vacuum cleaner that ran from the exhaust tailpipe, working on the venturi principle.


You could also buy one that ran of compressed air, no moving parts but it made a hell of an noise.

[Edited on 13/5/13 by britishtrident]





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Dualist

posted on 13/5/13 at 05:51 PM Reply With Quote
Used vac gens on numerous projects with robots, hope what you are lifting isn't too porous and you will need to get massive on the generator.
If you are lifting different sized items look for a 'Schmalz gripper' it uses a large pad with little valves that cut of small ports that aren't covered by the item you are picking up so you don't loose any vacuum.





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plentywahalla

posted on 13/5/13 at 06:30 PM Reply With Quote
When you say a small amount of vacuum, do you mean low negative pressure or low volume?

How about an old turbo? ... Low pressure but big volume





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rick q

posted on 14/5/13 at 04:55 AM Reply With Quote
Just borrow the home vacuum cleaner or get one of those cheap 12V car vacuum cleaners ...... and work from there.
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Litemoth

posted on 14/5/13 at 08:05 AM Reply With Quote
I've seen aquarium pumps used for pick n place ...?
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off-road-ham

posted on 14/5/13 at 12:15 PM Reply With Quote
Sealey Brake &' Clutch Fluid Bleeder Vacuum Type 1ltr VS020 Brand New | eBay

this is for brake and clutch bleeding (I have a similar 1) creates vacuum from air compressor.
usefull to have on its own.

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dave r

posted on 14/5/13 at 05:13 PM Reply With Quote
fridge compressor?





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NigeEss

posted on 14/5/13 at 05:32 PM Reply With Quote
Have a look here Venturi





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johnny chimpo

posted on 14/5/13 at 05:33 PM Reply With Quote
What kind of pressure are we talking about, how many kpa?
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