I never use HSS cutters in diameters smaller than 3/8.
They simply have too much flex, carbide only baby.
1/4 carbide cutters are (cheap ones) are about the same money as HSS anyway and work better.
Although a high grade carbide with TiCn or TiAln coating will outlast the cheap carbide 100X and is well justified in cost (and my personal recomendation).
This does not take into consideration any deficencies that your machine may or may not have.
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