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Creating vacuum from pressure
tegwin - 13/5/13 at 03:05 PM

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!?

liam.mccaffrey - 13/5/13 at 03:12 PM

search for vacuum generators

HTH

sprouts-car - 13/5/13 at 03:14 PM

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]

hughpinder - 13/5/13 at 03:27 PM

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

tilly819 - 13/5/13 at 03:30 PM

Venturi Principle

Tilly

[Edited on 13/5/13 by tilly819]

owelly - 13/5/13 at 03:48 PM

http://pages.ebay.com/link/?nav=item.view&id=110693154237

matt_gsxr - 13/5/13 at 04:15 PM

http://www.vaccon.com/Venturi-vacuum-pumps.aspx

John P - 13/5/13 at 04:18 PM

Used these in the past. Good but noisy.

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

Phil.J - 13/5/13 at 04:40 PM

Many years ago you could buy a car vacuum cleaner that ran from the exhaust tailpipe, working on the venturi principle.

robocog - 13/5/13 at 05:42 PM

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

britishtrident - 13/5/13 at 05:44 PM

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]

Dualist - 13/5/13 at 05:51 PM

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.

plentywahalla - 13/5/13 at 06:30 PM

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

rick q - 14/5/13 at 04:55 AM

Just borrow the home vacuum cleaner or get one of those cheap 12V car vacuum cleaners ...... and work from there.

Litemoth - 14/5/13 at 08:05 AM

I've seen aquarium pumps used for pick n place ...?

off-road-ham - 14/5/13 at 12:15 PM

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.

dave r - 14/5/13 at 05:13 PM

fridge compressor?

NigeEss - 14/5/13 at 05:32 PM

Have a look here Venturi

johnny chimpo - 14/5/13 at 05:33 PM

What kind of pressure are we talking about, how many kpa?