Spindle warm up

This may be a stupid question, but do you warm up your spindle before cutting?

A friend told me that I have to let it run for 5-10 min. before cutting. It helps with precision and spindle collet expansion (bit falling out). It has happened once or twice that my bit has fallen out during long runs, but I just assumed I had not tightened it enough.

Yes, I mean router. I don’t have a spindle.

I’ll just forget what he said. Thx

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