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Isn't the twist drill = wobbly hole something to do with feed speed and material thickness?
It's all the factors; material properties, workpiece geometry, workholding and machine kinematics, drill grind geometry, drill material, feeds and speeds. In the end, a drill is a tool for roughing out a hole which is approximately circular, approximately the desired size and approximately in the right place, although if you dial in the combination of the above factors for a particular case you can get close enough for government work.
gbj_tester
@M_V
Isn't the twist drill = wobbly hole something to do with feed speed and material thickness?
I'm pish at drilling holes where I want them but with the set that I have I can drill them round enough. Started out as a Bosch set but I've replaced various ones as I've snapped them, blunted them etc.
Think a step drill is meant to be much better for roundness if that helps?