Pitch of thread in inches: 1.5/25.4 = .059055
Multiply that by your desired rpm to get the feedrate. Eg., 400 rpm would require a feedrate of 23.622 ipm.
Use a spiral flute tap to auger the chips up and out of the hole as the tap goes in.
Many guys hereabouts would recommend a cold forming tap, which requires a slightly larger tap drill diameter, but there are no chips to contend with.
There is a variable in Haas setup for repeat rigid tapping, in case you find a need to tap each hole in two or more stages.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)