Hello,
I hope someone can give me some advice.
SPECS:
Haas VF4-SS, 6061 Aluminum, Flood Cooling
Chicago Latrobe 120DHT Parabolic drill, depth of 2.3 inches
I bought a company that makes a product that has been in production for quite a while. I am a one man show at this point. Somewhere on the order of thousands of parts already made, 160 or so by me.
We are drilling 8x holes per part at a depth of 2.3" deep, approximately. Accuracy only matters for the top 1" or so, and even then the tolerance is not all that important. We spot drill first and are using Chicago Latrobe 120DHT 1/8" parabolic end mills. Historically these have been drilled at 6112 RPM at 24IPM (200 SFM, .004 IPR) with a 0.75" peck drill. Since I have taken over the company (one man shop) I have cycled 160 or so units without changing out the bit, until recently when the installed bit broke. After the 1st breakI replaced it and the new one broke on the 1st hole. I replaced it again and got 5 holes out of it. Replaced again and broke on the 2nd hole. I have tried reducing my speeds and feeds to be as safe as possible with no luck.
I have reduced my SFM to 150 which is 4584 RPM and and a IPR to .002 but still broke. I get a lot of squeaking on the plunge. Any ideas? Tired of making scraps! Those broken bits don't come out and my oops pile (wall of shame) is growing and more importantly I'm out of production at the moment.
Thanks in advance!
Alex
I hope someone can give me some advice.
SPECS:
Haas VF4-SS, 6061 Aluminum, Flood Cooling
Chicago Latrobe 120DHT Parabolic drill, depth of 2.3 inches
I bought a company that makes a product that has been in production for quite a while. I am a one man show at this point. Somewhere on the order of thousands of parts already made, 160 or so by me.
We are drilling 8x holes per part at a depth of 2.3" deep, approximately. Accuracy only matters for the top 1" or so, and even then the tolerance is not all that important. We spot drill first and are using Chicago Latrobe 120DHT 1/8" parabolic end mills. Historically these have been drilled at 6112 RPM at 24IPM (200 SFM, .004 IPR) with a 0.75" peck drill. Since I have taken over the company (one man shop) I have cycled 160 or so units without changing out the bit, until recently when the installed bit broke. After the 1st breakI replaced it and the new one broke on the 1st hole. I replaced it again and got 5 holes out of it. Replaced again and broke on the 2nd hole. I have tried reducing my speeds and feeds to be as safe as possible with no luck.
I have reduced my SFM to 150 which is 4584 RPM and and a IPR to .002 but still broke. I get a lot of squeaking on the plunge. Any ideas? Tired of making scraps! Those broken bits don't come out and my oops pile (wall of shame) is growing and more importantly I'm out of production at the moment.
Thanks in advance!
Alex