Drilling fine

While woodworking often doesn’t require extremely fine and/or accurate holes, there are times when a fine set of drill bits would be very handy, and when it comes to fine bits, they don’t get much finer than these sets from Zona Tool.  They are supplied in Australia by Professional Woodworkers Supplies.

Zona

Whether you are model making, making jewellery, working with wood, metal, plastic, glass, ceramic, even stone, the ability to drill incredibly tiny holes is achievable.

But what do I mean by fine? How about 0.3mm to 1mm in 0.05mm steps (then from 1 to 1.5mm in 0.1mm steps)?  0.3mm, or 300µm.  Sure, that doesn’t sound too small when talking about sanding, where we are working with particle sizes in the 10s of microns (or less), but these are drill bits we are talking about!

To put it in scale, consider the humble Australian dollar coin.  It may not be angels dancing on the head of a pin, but here are the three finest drill bits in comparison.

Zona-3

Of course you won’t be mounting these bits in your standard power drill!  So in the first photo, you can also see a couple of bit holders/drivers from Zona as well.  One is double ended for larger and smaller bits, the other is a twist-drive, which can hold the finest bits.  None of these are particularly expensive either, with the drill bit set around $25.

They are available in metric and imperial, and interestingly, the blue box above are diamond coated bits, which is why glass, stone, ceramic etc are also able to be drilled with this precision.

Now while talking about sanding, PWS also have sanding/polishing sheets that go from 30µm, down to a miniscule 1µm.  That is the same particle size as the extra-extra fine diamond stone from DMT.

Zona-2That is so fine, you can use these to polish out scratches on CDs and DVDs. (Let alone achieve a mirror finish on an object).

1µm. 6 times smaller than an anthrax spore. Around P8000 sandpaper!  If that isn’t smooth enough, you have a real problem!

One Response

  1. I do use those tiny drills but I usually pop them into a mini-drill. I’ve not tried those spiral manual drills, do they work well? I am tempted by the drills with thicker shanks though as I don’t really need to drill really deep holes this kind of size.

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