Drill Bits and Sizes - Essential / Useful / Pointless


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The Tattooed One
26 Apr 2009
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Sutton Coldfield, UK
OK so I'm making my first cleat accessory to hold drill bits, but I want to do this right first time and future proof the damned thing BUT not to the point of obsession. So I have done basic research and figured out that the holder needs five sections - lip and spur, flat bit, Forstner, countersink, and augur. They seem to be the only types required (this is purely wood use obviously).

The next thing was to figure out which sizes I would need. Now I certainly don't have all of those bits yet, but I might as well leave gaps for the ones I might have in future. However I don't want to go leaving a gap for every available size of a type of bit if in reality those sizes are just pretty specialist, only made for imperial equivalence, or just utterly pointless in general usage.

So if I wanted to go the whole hog I would build in the following: -
L&S - 1mm to 7.5mm in 0.5mm increments, then 8mm, 10mm and (I stopped here....where should I realistically go up to?)
Forstner - 10, 12, 14, 15, 16, 18, 20, 22, 24, 25, 26, 28, 30, 32, 34, 35, 36, 38, 40, 45, 50, 55, 60
Flat - 6, 8, 10, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 28, 29, 32, 35, 38
Countersinks - 3, 4, 5, 6
Augurs - not looked into this yet, all of mine are imperial and I am trying to convert to entirely metric

So - any advice? I mean it's no biggie to design the thing to take every damned last one to be honest I'm just wondering how much space it would take up!