Figuring out the right drill size for screwsAn easy way to figure out how large a drill to use for screw holes, is just to hold the shank of the drill in front of the screw.
For machine screws, this helps you check the size of drill to use for tapping holes
in metal. Although, one does often pick a drill that is a bit on the small size
for a tap this way, as the proper size drill to use with a tap is usually a little
bit bigger than the minor diameter of the thread, whereas with this method, one usually
pics a drill that is no bigger than the minor diameter of the screw. For small tap sizes,
this means backing out frequently, or risking breaking the tap.
For putting wood screws in hardwood, its also useful. Wood screws actually require surprisingly small amounts of 'bite' to hold well in hardwood. Using a drill that is just the minor diameter of the wood screw often results in twisted off wood screws.
For soft woods, it doesn't matter as much, ad one can often get away without pre-drilling
at all in soft woods. Though pre-drilling does make the screws go in much easier, and
really cuts down on the probability of splitting the wood.
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