Bottom Chamfer in BOBcad-CAM V25

[magicniner]

You are asking V25 to do something not supported at it's release but it should be possible.

You can do it with 2D geometry with a little ingenuity, I use a thread milling operation with one turn and near-zero pitch to generate code to cut a groove at the bottom of a blind hole, this gives you the lead-in and lead-out to get in and out of the hole clearing the cutter, you can edit the Z move round the one turn out manually fairly easily if you need to.

If you need more help you can give me a file to put an example into for you,
Regards,
Nick