Quote Originally Posted by mekanik View Post
Appreciate what your saying Dean, and i would suggest that a gas cylinder was used as opposed to a second hand compressor tank. The one i have is prestine internally.
Regards
Mike
Yep I agree just don't weld it up.! . . Thats another playing with fire thing I've experienced first hand and very scary.! Pocket of gas in metal exploded and just looked like it had been shot with a bullet I shite my self. . .

Boyan I did some playing around with vacuum a while ago and found that the small pipe was ok if your just pulling and maintaining high vacuum but soon as the vac dropped IE drilling just a few holes the Vacuum would drop and part would loosen.

Noticed Larger pipe held longer and allowed more holes before dropping I think due to more volume thru the pipe but it didn't allow the same high vacuum.
So I'd say if your not cutting thru then small pipe for better higher vacuum and if you plan on cutting thru in a few places then larger volume needed.

I'm a fan of Vac pods they can be placed any where and can work around them, esp good for profiling.