Curious to how everyone goes about chamfering the bottom of a thru bore on a part. Say we have a 1" thick plate were opening up a laser cut hole to a finished diameter, then I want to chamfer the top and bottom of that bore. My current process is drawing 2 circles on the center of the bore, then changing the diameter of these circles and there z depths until it looks right in simulation. This is not hard, but its annoying fiddling with the arc diameters and z position several times until I get the correct chamfers I'm after. There has to be an easier way to do this I am hoping.

Here is what the test part ended up looking like.

I have a part that has an id oil groove that cannot start or exit outside the front or back. The part is 4140 material with a 6" bore and is 6" long. I did a test part out of plastic and got the results I was after but am a little skeptical on how well this will go in steel. I used c axis contour and after fumbling around with different settings I had something that posted somewhat close. I still did a bunch of hand editing to the code however. Using a full radius groove insert, I started the tool in one of the cross holes and went back and fourth until it got back to the start point. Repeated this process several times until final depth was achieved then repeated with the C 180 different to get what I was looking for. The machine I tested this on was a Mori nl3000, but were probably going to be running this on an Okuma Multus. Machining this feature is new to me, my main concern is having the insert break or rolling a burr with going at it this way. I attached the test file, just scaled the part down to a size we had for a plastic test. Maybe its the right approach? Thinking taking .003-.005 depth of cut in steel maybe? Here is what my code ended up looking like G98 G17 M45 G28 H0. G54 G0 T0909 G0 C0. Z.1 X2.5 Z-1.3063 G98 G1 X2.62 F10. W1.0886 H-180. F100. W-1.0886 H-180. W-1.0885 H-180. W1.0885 H-180. X2.63 F10. W1.0886 H-180. F100. W-1.0886 H-180. W-1.0885 H-180. W1.0885 H-180. X2.64 F6.16 W1.0886 H-180. F100. W-1.0886 H-180. W-1.0885 H-180. W1.0885 H-180. X2.65 F10. W1.0886 H-180. F100. W-1.0886 H-180. W-1.0885 H-180. W1.0885 H-180. G1 X2.5 F10. G0 Z.1 G28 V0. G53 X0. Y0. G53 Z-30. M01 OIL GROOVE TEST 3.0 PLASTIC INC METHOD.mcam