While I won’t claim to know all there is to know about drilling,
I’ll share what I do know…
Is it "better" to drill holes in metal that is hard or annealed?
Generally it’s better to drill annealed metals, I’m assuming you are
asking about the more common jewellery metals.
Are there any dangers, such as structural failure, when drilling a
piece of metal numerous times?
The closer the holes are together the less metal you have left
holding the holes in place (in this situation it’s best to think of
the holes as the work and the metal as the “air”), there is a point
at which you run out of structural integrity and the piece (the
holes) fall apart.
Which method is better when enlarging a drilled hole: drill again,
using a larger drill bit or using a needle file?
The best method to enlarge drilled holes (it you want to keep the
holes round that is) is by “step drilling” the holes with
increasingly larger drills until you reach the desired holes
Does the same drill bit behave differently with different metals
(copper, silver, gold)?
Short answer; YES, but for small holes (1mm and down) the changes in
behaviour is quite small and can (in most cases) be ignored, but for
some metals e.g. copper you have a very different edge profile than
you would for, for example iron or steel. The body of in
this topic is quite literally huge and can take a lifetime to
Please take this as a rather rudimentary surface treatment of the