monkeyfist
Established
I have attempted to have holes cutout from a crazed drum before and it went horribly bad. Everything looked great but as soon as mounted the drum on a scanner, it was clear that the drum was not balanced and would shake the scanner quite dramatically. It was cut using a CNC machine and I can't imagine if someone could cut it any better.
Just a fyi before anyone attempts to get a drum cut for negatives.
Pali
Hah, i actually did this also. Used laser CNC.
Had no balance issues, as i cut a hole for 35mm negative right on the mounting side so it would not wobble. But i think the laser might have warped the edges of the hole a bit and there is no way of getting the whole negative in focus.
CNC milling machine would have probably done a better job, and it might have worked for smaller negatives. Otherwise, it would just require balancing the drum.. much like we do for car wheels.