View Full Version : drill bit angle
Dean S Walker
10-16-2018, 7:25 AM
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
10-16-2018, 11:24 AM
118* is preferred for softer materials like wood, plastics and soft metals. 135* works best in harder materials.
Greg R Bradley
10-16-2018, 11:44 AM
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
10-16-2018, 6:13 PM
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
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