Being a "Lazy" so and so..I found it easier to buy various drills and keep the drill bits fixed, rather than change them... typically for my pcb processing...Mini drill press with 0.8mm, Larger drill press with 3.2mm for mounting holes.. Small Bench drill press with 10mm chuck for various and a Minicraft with a hex chuck for inter changeable bits.. Thats just in the pcb area...in the build area another Minicraft with 1mm drill for those pcb holes that need 1mm. and it also doubles with dental burrs to remove excess copper or mistakes. Then in the basement another bench press drill..... Hitachi cordless for those "odd" jobs. You can never have too many drills
