Machine 1,
Here is some info from the Iscar Book:..
First choice grade = IC910
second choice = IC4050
last choice = IC20 (uncoated)
speeds:
IC910 Grey cast = 1310 to 720 sfm
Nodular = 790 to 410 sfm
IC4050 Grey = 980 to 660
Nodular = 660 to 410.
chip load :
IC910 .004 to .012
IC4050 same
Feed:
IC910 .0028 to .0039 for finish up to .315 doc
IC4050 same
No info on IC20 but it would be less as it is uncoated.
Hope this is of some help.