Vacuum table Setup Advice

[Boyan Silyavski]

UNI-JET 75

Max. vacuum level: 140mbar (continuous service)

Are you sure you have got the right pump?

you need ~25 Inches Hg which is around 850mbar vacuum

My air compressor at home pulls on the inlet 0.94 bar =~ 940 mbar =705.05993009406 mmHg

Your pump is way off, it seems.


Who told you to look for CFM? you dont have 4x8 machine where you need 20HP pump with CFM rating.


Unscrew your air compressor/ what ever size, 1-2hp is ok/ inlet filter and connect the vacuum table and check what i am talking about. Dont worry about the continuous use, nothing will burn. In fact it runs cooler. Temperature rises from compression, not suction. If your compressor is newish it will make damned good vacuum.

[andy_con]

Ok, so I have the wrong pump?

Not sure what you mean by


you need ~25 Inches Hg which is around 850mbar vacuum

What's an air compressor got to do with a vacuum table

Sorry I don't fully get your reply

[Boyan Silyavski]

i am saying that the job could be done by any 1-2hp air compressor with or without additional expansion chamber. which cost for 2hp ~70 euro at any home depot.

so you can hook the compressor and check if you have all right, cause with the compressor should work Ok without any problem.

what i am saying is that a typical air compressor pulls 6x more the vacuum compared to the pump you have bought

[Boyan Silyavski]

please read that thread http://www.mycncuk.com/threads/8294-DIY-Vacuum-Fixtures

[andy_con]

I don't understand how you can use a compressor, but will take a look at that other thread at lunch.

A compressor blows air, not sucks air

I only have a small compressor

BB24D:


http://www.bambi-air.co.uk/uploads/f...dget-Range.pdf

[GEOFFREY]

For a compressor to compress air it must first suck the air in through the inlet filter. If the inlet is blocked or choked it will pull a vacuum. Boyan has suggested trying to use that vacuum to operate your vac hold down. that would be a very simple and cheap (free) way to check if the system works. Good luck. G.

[andy_con]

Ah now that makes perfect sense thanks.

When you say the system works, I know the table and bits work as work peice does get held down just not strong enough.

I'm assuming you wpuld only use a compressor to test not as a final solution as the compressor would need to be running for an hour straight to draw a vacuum whilst you do the machining?