Bow drill troubleshooting: when no ember forms

An ember forms when enough very hot, fine wood dust collects in the notch of the board and stays together there. The dust comes from wear on the spindle (the spinning stick) and the socket. The notch is a wedge-shaped cut at the edge of the socket where the dust gathers, stays warm and eventually starts to smoulder by itself.

For this to work, pressure and speed must match. Too little pressure just lets the surfaces slide over each other and polishes them. Too little speed produces dust, but only lukewarm dust. Moisture in the wood uses up heat because the water has to evaporate first before the wood can get hot enough – which is why no technique helps with damp wood.

Lots of smoke but no ember: usually you stop too early or the notch is too small. Smoke only means that it is getting hot – not that there is already an ember. Keep going for a few dozen more even strokes after the first smoke and widen the notch so that it reaches roughly to the centre of the socket.

Squeaking and shiny surfaces: spindle and socket are “glazed”, i.e. polished smooth, and slip instead of grinding. Roughen them with the knife and start with more pressure. If it keeps happening, the wood is probably too hard or too resinous. The dust also tells you a lot: light, coarse dust points to too little speed or damp wood. Dark brown to black, fine dust that clings together is a good sign.

The spindle pops out: carve it straighter and rounder, deepen the sockets slightly and brace the hand holding the bearing block firmly against your shin. Move the bow along its full length and evenly. If the cord slips, adjust the tension; if the top end gets hot, smooth or grease the upper socket and carve the top of the spindle a little more pointed.

The wood matters more than anything else. It must be dry, medium-hard and low in resin. Wood species are deliberately not named here because the atlas does not describe plant identification – it is best to learn this on a course with wood that someone knows for certain. Unsuitable wood cannot be “corrected away”.

Body position is just as important. A stable, calm stance with your foot firmly on the board and the pressing hand braced on your shin makes the movement even. Jerky, short bow strokes produce less heat than long, steady ones. And once the ember is there: leave it alone for a moment before moving it – a young ember falls apart easily.

The bow drill takes a lot of strength and sweat. In a real emergency with cold and exhaustion, exactly that can become dangerous, because sweaty clothing and fatigue make you cool down. In that case, first secure warmth with clothing and shelter and use modern ignition sources. Always carry at least two of them.

When re-cutting the notch and socket, work away from your body and rest the board securely, not on your thigh. A practice fire is also a real fire: check local rules and wildfire danger beforehand and keep extinguishing water ready.

Practise in good weather, with wood you know and with plenty of time. Change only one thing at a time – for example only the pressure or only the notch – so you can tell what really helps. A partner who watches and tells you whether the spindle is upright is very helpful.

Success rates typically improve only after many hours of practice. That is not a sign of clumsiness; many small details simply have to come together. When your arms get tired, take a break – with exhausted muscles the movement gets shaky, and that costs more than it gains.