DIY MQL (minimum quantity lubrication; no fog or mist)

[@gerritvisser]

I converted one of those to fogless as well. One thing that hinders the adjustment is that almost all of those things have Out valves, not in. So in essence the valve is being used backwards and doesn't actually regulate well. In valves are harder to find but are out there.

[@andrewwakefield4519]

Excellent point. Thanks!

[@bradgeary3467]

i can’t find any info on mql fluids, coolant vs lubricant…….. any idea where I can learn more? goal is to keep my turning parts from getting as hot as they do and having to wait for them to cool to measure. rust is not an option. do you run oil,? seems most kits include or offer cutting oil for this kinda thing

[@andrewwakefield4519]

I am no expert, but my understanding is that soluble oil is what is typically used. I made an attempt to made my own, using an emulsifier - it works so-so. At some point I will invest in a gallon of soluble oil concentrate; that will probably last me the rest of my lifetime, no more often than I use it.

[@robm.6825]

Nice system. Where did you get the clips that hold the tubes together? Also, what psi are you running? Thanks!

[@andrewwakefield4519]

Thanks! On the psi, I've been running around 30, but next time I plan to try more like 20 - I'm still experimenting to find the best value. On the clips, I 3d printed them. As noted in the description, I posted the plans and the .stl file for the cap and gasket in this thread: www.homemodelenginemachinist.com/threads/mql-system-compare-to-fog-buster.34016/ (post # 6). However, I had neglected to include the .stl of the clips; I have added that now in post # 7.

[@robm.6825]

Thank you! I know fogbusters run at 10-20psi, maybe that will work better.

[@torstenmartinsen375]

What lubricant are you using?

[@andrewwakefield4519]

A DIY mix - water, some oil, and a bit of lecithin to emulsify it. I saw the formula on a forum and gave it a try. I don't have much experience with soluble oil coolant, so can't compare it to "the real thing," but it seemed to work okay for my limited needs.

[@Festivejelly]

You got the ratio of liquid way too low there. For steel you need a bit more. Aluminium its fine to have a very light spray.

[@andrewwakefield4519]

Thanks for the feedback. I have not had a lot of occasion to experiment further with it, but I have found the need for more liquid in some of what I have tried.