What specifications should the drill have when drilling stainless steel?

When drilling stainless steel, the specifications of the drill bit are critical for achieving effective results. An included angle of 140° combined with low-speed operation is ideal for several reasons.

Firstly, the larger included angle allows for a more efficient cutting action because it helps in creating a sharper edge that can penetrate harder materials like stainless steel without excessive wear. Stainless steel is known for its toughness and propensity to work-harden, so having a more acute cutting edge is advantageous.

Secondly, using a low-speed setting is essential when working with stainless steel. High speeds can generate excessive heat due to the friction caused by the cutting action. This heat can lead to the drill bit losing its temper (hardness) or even cause the stainless steel to harden further, making drilling even more difficult. Consequently, a slower speed keeps the heat at a manageable level and contributes to a longer lifespan for the drill.

In summary, the combination of a 140° included angle and low-speed drilling is well suited to address the unique challenges posed by stainless steel, ensuring that the process is efficient and that the tools used remain effective throughout their use.