If your problem is that the chuck on the pillar drill doesn't close down enough to grip a 2mm drill bit then the simplest solution is to buy a smaller chuck ...

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Almost all of these bits are dull black or gold-ish colored and don't have much else in the way distinguishing them (that I know to look for). They just look like generic drill bits (not forstner, paddle, etc).

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STAINLESS STEEL-HARD. 50 – 250 .0002-.001 .001-.002 .001-.005. TITANIUM-SOFT ... If this conditions exists,. Conventional Milling should be used and feed per ...

Metal drill bits, on the other hand, have just an angle at the tip. They often are fully black (plain HSS), golden (often titanium oxide finish) or coppery (often cobalt steel) in color:

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This paper deals with the influence of the end mill helix angle on the flatness and surface quality of aluminium (EN AW 6082) thin-walled parts.

It does matter - wood drill bits won't work on metal (destroying the bit in the process, unless used on thin and soft metals) and metal drill bits will increase splintering and tear-out when used on wood (but this depends also on the wood type and the diameter of the bit, and for smaller diameters there is little difference between wood and metal drills bits).

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Aug 23, 2024 — We cover three of the most common operations including turning, drilling, and milling. Machining is a very common and versatile manufacturing process.

This set contains 7 multipurpose drill bits for precise drilling in a variety of materials with your Dremel Multi-Tool. Easily drill clean and smooth holes.

There are also copper coloured metal drill bits that are more suitable for metals, then there are darker metal drill bits that you use for walls.

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As for how to tell them apart - wood drill bits have two distinguishing features: a spar (also brad) and a lip. The spar helps in keeping the bit centered when starting the hole and prevents wandering of the bit on the surface of the wood. The lip acts like a chisel, slicing through the wood fibers in the circumference of the drilled hole, improving the quality of the finish. This is most important for through holes, where the lips helps reduce "blow-out" of the wood when exiting the wood on the other side. Wood bits are typical black and silvery in color, but other colors exist.