My new lathe has a coolant system, and the shop gave me a free bag of coolant concentrate, but I'm not sure when or even if I need to run coolant?

I spray a bit of WD-40 on to the job when turning aluminium to stop it sticking to the carbide insert, and use cutting fluid when drilling steel with HSS drill bits, but do I need coolant when using carbide inserts on steel?


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