vacuum pump, need help

Look for "joker" AKA: "mechanical ass hole" valves.

They will be made of some kind of rubber.

Lew

Do you know about or have you looked at

fish tank's use check valves in air lines. perhaps something in that area?

I do not have an idea of what it cost but check out the website

You may all so do a google search. As I said cole parmer is a lab supply house and parts may be available through other laboratory type companies.

Check out Bill Noble, he's the king of used vac stuff and great ideas/info..

mac

Please remove splinters before emailing

Or just use a good vacuum cleaner. Lots of aircraft builders vacuum bag composites that way, and guys build laminated veneer surfboards and skateboards with vacuum cleaners too.

Good way to burn out a vacuum cleaner motor.

Lots of dead vacuum cleaners.

Vacuum cleaner motors are designed to be air-cooled. If you run them into a vaccum, they overheat. Now you _might_ get an adequate vacuum from this initially, you might even have few enough leaks that if you cap it off then the clamping pressure will remain adequate until the glue sets. However it's a hack and a bodge at best.

My best vac pump, genuine lab surplus, cost £25. For that little money, why bodge?

Well, my Sears vacuum has a separate fan for the motor, so perhaps you should not generalize.

If you can't find anything by the end of march, write me. I have a hanfull of little grey plastic valves that should work for you and you can have them for $1 each. If you have an air compressor, I believe HFT sells some sort of vacumn device that works off an air line.

I would think that, if you could produce a vacum and had the right chck valves, you would not need to run the VC constantly and could avoid the over heating mentioned.

PS, some nice links offered up on this thread. Thanks. Such are the sort of "benefits" one hopes to find on such a list.

Depends on the vacuum cleaner. Note I said a GOOD vacuum cleaner. GOOD vacuum cleaners have bypass cooling. Ametek Lamb motors are an example. NONE of the cooling air goes through the vacuum, and NONE of the vacuum air goes through the motor. Of all their motors, only a very few (like the 119997 ) suck air through the motor. The guys I know using them have not burned them out.

Notice the use of "bodge". Sounds like a UK guy - must be those lucas vacuum cleaners.

The only thing that Lucas makes that doesn't suck.

My Ametek Lamb powered HVLP rig uses a non-bleed spray gun by design. I don't see a huge difference between shutting off the air on my gun, and pulling a vacuum.

So, pay them. The reason those valves are in the pump head is that the compression ratio of the pump depends critically on the valves being close to the cylinder. If you put the valve on a pipe, the ultimate vacuum that the pump pulls is compromised.

whit3rd wrote in news:f116fbf2-bf78-43ea-bcb9- snipped-for-privacy@72g2000hsu.googlegroups.com:

Pay them with what? I'm not know for my good looks. The reason I posted asking for help is that I *have* no money or else I would just have bought the parts.