Pat G
Hot Rolled
- Joined
- Apr 12, 2009
- Location
- California
I'm boring 7/8" cold roll steel to get a flat bottom at 2.250" depth- .563 in diameter.
What I've been starting with is peck drilling an 11mm hole with a carbide bit I have an abundance of, then following with a 1/2" x 4" long 4 flute carbide center cutting end mill to get a flat bottom, then using a boring bar to finish.
The carbide end mill works well until the edge chips and breaks, then it takes out my .250 I.C. boring insert.
Is there a better 1/2" bit to use for this? Roughing end mill? Roughing finishing mill? Flat ended dill bit? HSS center cutting end mill? Coated? Or?....
The cycle time is taking longer to get the end result than I would like. Sure would like to find a better way.
What I've been starting with is peck drilling an 11mm hole with a carbide bit I have an abundance of, then following with a 1/2" x 4" long 4 flute carbide center cutting end mill to get a flat bottom, then using a boring bar to finish.
The carbide end mill works well until the edge chips and breaks, then it takes out my .250 I.C. boring insert.
Is there a better 1/2" bit to use for this? Roughing end mill? Roughing finishing mill? Flat ended dill bit? HSS center cutting end mill? Coated? Or?....
The cycle time is taking longer to get the end result than I would like. Sure would like to find a better way.