drill bit angle

[Dean S Walker]

The previous thread got me to thinking about the andle of a drill bit. There are 118 degree, 135 dregee etc. what is best for wood. I'm talking twist bits.

[Bruce Page]

118* is preferred for softer materials like wood, plastics and soft metals. 135* works best in harder materials.

[Greg R Bradley]

A lot more going on in addition to tip angle with thickness of the web, materials, etc. Here is a chart from Triumph Drill:
394950

[Wayne Lomman]

No set rule for me. It depends entirely on what the purpose of the hole is. For example, if you want quick and rough, go for a greater angle, if you have thin material, go for a shallow angle etc. The comments from Bruce and Greg are the starting point. Cheers