Hello,
What I am looking to do / make, is use something that will control the compressed air (30psi or lower) to give me “puff…….puff…….puff” say every 2-5 seconds (adjustable).
I thought about using a pop off valve of some description. Somehow?

Just to put you in the picture, I have CNC Sherline mill, using small dia ( .5 – 2mm) and re-cutting the chips is not good – tends to break the cutters. I have also found that an interrupted air flow works better than a continuous one for clearing away the chips.
So any thoughts anyone, - no electrics, ideally should be self contained perhaps with a “twiddle knob” to control the time between puffs.
Any ideas, a little box 30psi in one side and “puff…….puff…….puff” out the other.

DaveH