I have to drill 50 .394" holes into the body of a titanium tube that is approximately 36" diameter X 44" long with 1/4" wall thickness.
The part is programmed at 900 RPM with a feedrate of 1.9 IPM. I am using a solid carbide drill. The problem I am having is the force of the drill is compressing the tubing as it drills and when the drill breaks through the tubing snaps back into place and chips the drill, causing the drill to cut over-sized on the holes that follow. I have been successful slowing the feedrate to .9 IPM, but had a drill fail on me this week and am looking for a better solution. In the past when I did my own programming I would drill a small pilot hole in situations like this to lessen the load on the larger drill. Is this something I should recommend to the programmers at my new company? Are there any other suggestions for getting around this problem? Any help would be appreciated.
Howard
The part is programmed at 900 RPM with a feedrate of 1.9 IPM. I am using a solid carbide drill. The problem I am having is the force of the drill is compressing the tubing as it drills and when the drill breaks through the tubing snaps back into place and chips the drill, causing the drill to cut over-sized on the holes that follow. I have been successful slowing the feedrate to .9 IPM, but had a drill fail on me this week and am looking for a better solution. In the past when I did my own programming I would drill a small pilot hole in situations like this to lessen the load on the larger drill. Is this something I should recommend to the programmers at my new company? Are there any other suggestions for getting around this problem? Any help would be appreciated.
Howard