Compressor specification for alu chip blower

[JAZZCNC]

It takes a fair bit of air to blow chips completely clear but your correct the nozzle and pressure is the secret.
The problem lies not so much with the DOC but more has you get deeper the chips become harder to clear the slots so more pressure needed.
Can't advise on either I'm afraid has the Nozzle used will determine PSI needed and my straight blow setup is very crude being a length of car break pipe with end nipped with pliers.?
It's not has bad or crude has it sounds and I did used to have a purpose built pipe which used motorcycle main jets for nozzles but found them restrictive and too direct. This setup works much better and I can change spread very easily by just crimping the end with pliers on the fly if needed.

I also have a mister which works very well but can't help with that has it's a commercial component with a quite complex venturi system and multi nozzle system. It also eats air and needs a far sized CFM and tank.
Also on my system I just leave the PSI on Comp set to 90psi and control the blown air on machine with 2 valve's. One for each system.

If you want to have blown air under machine control then don't have it turn the comp on/off directly has there's too much surge and the load will be high. Instead use a 24v solenoid valve to cut the air thats controlled thru a low power 5v relay from an input. The coolant or spindle relay on a BOB would work fine or any 5V external relay.

Edit: This would also give the added benefit of being controlled thru G-code M8/9 commands and air flow will stop for cutter changes and automatic resume when hitting cycle start again. You can also choose which tools in the code use air and which don't.

Sorry can't give more specifics but with trial and error you'll get it right. My only advise is the bigger the comp/tank the easier it will be.


A can tell you a 50ltr Hobby Comp will empty faster than you realise if you want to keep the slot clear and it will be working hard and often, like almost 100% duty if you don't get the nozzle setup correctly.