Crankshaft Drill Mean?
A crankshaft drill is a variation of a twist drill made especially for drilling deep holes in harder materials. This type of drill has a higher helix angle than traditional drills, therefore, increasing the penetration efficiency in denser materials such as steel. In addition to the high helix angle, the crankshaft drill also has a sharpened (or notched) tip which further increases cutting power.
A crankshaft drill is also known as a split-point drill.
Trenchlesspedia Explains Crankshaft Drill
The unique features of the crankshaft drill make it better suited for drilling curved surfaces and metal alloys.
The helix angle in this type of drill bit usually ranges between 118 to 135 degrees. The notch at the tip of the bit generates two small cutting edges, which help reduce de-centering or “walking” of the drill bit when in operation. Combined, these features allow for faster drilling with fewer complications.
Because crankshaft drills are often used for metal drilling, they are available in harder materials such as cobalt steel and carbide.