MQL system based on a car fuel injector that needs no compressed air

MQL system based on a car fuel injector that needs no compressed air

This topic has 4 replies, 5 voices, and was last updated 21 September 2025 at 11:14 by cogdobbler.

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20 September 2025 at 22:15 #816835
Huub
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@huub
I needed a Miniumum Quantity Lubrication system (MQL) for my lathe but didn’t want a fog system to avoid aerosols. I decided to make a system that uses a garden sprayer that function as “fluid pump” and a car fuel injector to regulate the flow. A small ESP32-C3 micro computer control’s the flow by pulsing the injector. You could wire wrap the whole thing or control the injection valve directly by your CNC controller using only a solid state relay.
The build cost are about 30 € (30 US $). You can download the design, schematics and the firmware on Git. A video showing the system in action and explaining how it is used is available on YouTube
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21 September 2025 at 05:37 #816844
John Haine
Participant
@johnhaine32865
Ingenious, thanks for posting!
21 September 2025 at 09:51 #816866
Clive Foster
Participant
@clivefoster55965
Wonderful idea.

I guess the folk who aren’t happy with microprocessors, programming et al could use a simple 555, or similar device, as a variable frequency pulse generator for a discrete component driver.

Clive
21 September 2025 at 10:50 #816872
Michael Gilligan
Participant
@michaelgilligan61133
I like that a lot, Huub

… an excellent idea, nicely executed.

MichaelG.
21 September 2025 at 11:14 #816874
cogdobbler
Participant
@cogdobbler
What a great idea! Thank you for sharing it.
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