After laser cutting all parts from harden-able steel need to be fully annealed.
You can also have hole locations on blanks merely laser pierced and drill them out later. You’ll have a very tiny hole in an exact position that has not had enough heat exposure to harder the steel.
How many holes did you clean out?I just cleaned up 225 laser cut blanks with one very used 120 belt, one drill bit and a few old chamfer bits. I'd try to drill them out with a decent cobalt bit.
Fiber laser... not many holes. Nitro-V air hardening steel.
That is real interesting. Usually, the clean up passes are the worst because the nitriding/carbiding is so thin and only the corner of the drill makes contact. That can be mitigated by gas mix and dialing in the set up. Sounds like you got a good laser outfit.225 as this one only has a lanyard hole. They were only a few thousandths under though so probably not too helpful here.
My standard practice is to laser cut .007" undersize and ream to finished size after heat treat with a carbide reamer.
This is not true, I don’t know where you heard this.
Carbide will drill it out no problem. A little trick if the hole is just a tad on the small size then chuck up a carbide burr in your drill press and open up the hole. All the blades we cut here I center Mark with the cnc and then drill after. I use a carbide drill to spot drill the hard mark then drill to size with standard drill bit. Just remember to grind your profile a little bit to remove the HAZ. On the blanks we cut I usually recommend our customers remove .02 from the profile. The HAZ is less then that but better to much then to little.