A hole, even a small one, also makes drilling much easier. Punch a dimple with a center punch, and start with a small drill, which will stay in the dimple better than a big one. Honestly, I'm a big fan of pilot holes simply because they are easier to position precisely. It's hard to gauge feeds and speeds when overdrilling in small increments, but again you have it right if you have cool fast running with long chips. In that case, drill a smaller hole of a size where it is practical. On a large bit diameter, the pressure required to hit the "sweet spot" may be impractical with a hand tool. Being gentle/wimpy is the most common error.
Unfortunately with hand drills, there is no such thing as feed rate, and "feed force" is an imprecise substitute.
To be clear, one type of "wrong feed" is too little feed. The machine industry has exhaustive tables and formulas which serve as starting points, but it's also helpful to listen to what the tool is telling you. drill bit) and the speed of movement into the material.
Mainly, we are concerned with feeds and speeds. If anything else is happening, stop doing that RIGHT NOW.Ĭontinuing not only wrecks the bit, but can work-harden the surface of the hole, which will make it harder to start doing it properly. run quite cool, to where you can disengage the bit from the work and grab it with your fingers without fear, and it feels barely warm.cut long, continuous "chips" (strings, really) that come off like pasta, to the point where you sometimes have to intervene to break them, to keep them from rats-nesting around the drill.This is true for generally all tool-bit-upon-steel work.
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