The first kind is water-soluble cutting fluid (processing aluminum alloy, zinc alloy, copper, bakelite and various plastic parts).
Water-soluble cutting fluids are divided into microemulsion, semi-synthesis and total synthesis.
The second kind is oily cutting fluid (processing all kinds of steel)
If you are processing parts, I personally suggest that you buy semi-synthetic (about 2800 RMB a barrel, I have been using this. )。 Because microemulsion stinks easily and embroiders easily. If the completely synthesized particles are too large, foam will be produced, which is not conducive to the circulation of cutting fluid. That's all.