Try Ebay with the search "solid carbide spiral". Can usually get a better deal over there.
I'm using 2-flute spiral upcut bits and have over 100 hours on some of them cutting soft and hard woods as well as MDF. Plunge works fine. When not in use I soak them in a jar of acetone to dissolve any residue accumulation from the previous session.
Be aware that the same physics that lifts the chips up out of the hole will also exert forces that pull the workpiece up from the table. Make sure everything is clamped securely. |