Mist Coolant Project

**routercnc** · 06-11-2018

Originally Posted by magicniner

A peristaltic pump with a stepper gives you positive and predictable fluid delivery, no pressurised containers with pressure settings, needle valves, fluid viscosity and so on to upset the balance of perfect lube volume delivery.

It's all completed and connected up, right this minute it's lubing, with just enough air to clear chips from the cut, a job cutting parts from 2mm D2 Tool Steel plate with a 2mm 4 flute EM, seems to work nicely :D

Sounds good ! I have a spare stepper and driver plus I think there is a psu somewhere. I guess a variable pulse generator is a pretty cheap module to buy ?
Silly question but does the drip feed into the last part of the nozzle inside the tube or does it drip into the air flow?

**cropwell** · 06-11-2018

Originally Posted by routercnc

Sounds good ! I have a spare stepper and driver plus I think there is a psu somewhere. I guess a variable pulse generator is a pretty cheap module to buy ?
Silly question but does the drip feed into the last part of the nozzle inside the tube or does it drip into the air flow?

This is the nozzle I bought https://www.aliexpress.com/item/New-...1-dc8fbff7776e

It has liquid fed to the centre and air around it. The airflow atomises the coolant. I am not sure, but I think it also generates a venturi vacuum to pull the coolant into the air stream.

I think this is the one that Nick used, but there are more pulse generators than you can shake a stick at on AliExpress.

https://www.aliexpress.com/item/8-24...4-a44ab6a74f1d

**magicniner** · 06-11-2018

You don't want Atomised coolant, you want the drops to be large enough to drop out of the air, Atomisation is easy with any Scent-Spray type arrangement but it will bugger your respiratory system unless you use truly massive extraction, enough to negate the heating in any shop on a cold day!

**cropwell** · 06-11-2018

Exactly right Nick! That is why I was thinking of the step system so that you delivered coolant without air or air without coolant (or both or neither) at each step of the 8 step sequence. The mister nozzle I bought was to experiment with, if you used it as designed you would get a fog in the workshop.