Seimens 828D Turning: IPM and RPM using G94 and G97 vs G971..should I use G962/G972?

[bradley.daley]

Hello, 

I have a Romi C420 with a Seimens controller and the default post for seimens turning outputs code that looks like the code at the bottom of the post. 

The issue we are having is the post outputs a G94 (good!) to put the machine into inches/minute feed, and the feedrate in the moves below is F2.6 which seems fine at face value. 

But when we run the code the machine moves very quickly on Z and plunges the drill into the work (thankfully we were dry running it!) and the controller shows F2.6 in/rev!

I found the source of my issue, and that is using a G97 cancels the SFM spindle speed control and sets motion to in/rev mode. 

A G971 call would also cancel SFM spindle speed control, but set motion to in/min mode. 
I was able to test and prove this today doing manual edits. 
I have not tried using a G972 (it was not in my book, but from a seimens manual I found online) 

G972=

Deactivate constant cutting rate with feedrate type as with G94 or G95.

Would that do what I need?
Should I just modify my post to use G962/G972 instead of G96/97 only?
Any good logic out there on how to address this issue?
Thanks!

; %_N_1001_MPF
; Machine
;   vendor: Romi
;   model: C420
;   description: Romi C420
; T6 D=0.5 CR=0 TAPER=152deg - ZMIN=-1.6 - drill
N10 G90 G94 G18
N11 G70
N12 LIMS=4000
N13 G53 G0 X8.
N14 G53 G0 Z10.

; Drill2 (3)
N15 T6 D1
N16 G54
N17 M8
N18 G94  // G94 sets my feed to IPM (vs G95=in/rev)
N19 G97 S550 M3 // G97 sets the spindle to RPM mode and un-does the G94 by setting feed to in/rev! (a problem given the F2.6 below!) G971 would be RPM and IPM mode. 
N20 G0 X0. Z0.62
N21 F2.6
N22 G0 Z0.22
N23 Z0.2
N24 Z0.08
N25 G1 Z-0.125 F2.6
N26 G0 Z-0.115
N27 G1 Z-0.25 F2.6
N28 G0 Z-0.24
N29 G1 Z-0.375 F2.6
N30 G0 Z-0.365
N31 G1 Z-0.5 F2.6
N32 G0 Z-0.49
N33 G1 Z-0.625 F2.6
N34 G0 Z-0.615
N35 G1 Z-0.75 F2.6
N36 G0 Z-0.74
N37 G1 Z-0.875 F2.6
N38 G0 Z-0.865
N39 G1 Z-1. F2.6
N40 G0 Z-0.99
N41 G1 Z-1.125 F2.6
N42 G0 Z-1.115
N43 G1 Z-1.25 F2.6
N44 G0 Z-1.24
N45 G1 Z-1.375 F2.6
N46 G0 Z-1.365
N47 G1 Z-1.5 F2.6
N48 G0 Z0.22
N49 Z-1.42
N50 G1 Z-1.6 F2.6
N51 G0 Z0.22
N52 Z0.62

N53 M9
N54 G53 G0 X8.
N55 G53 G0 Z10.
N56 M30