g96/g97 question on emcoturn 340

hi,

i'm using a siemens 810 on an emcoturn 340 and am having some
problems with using a constant spindle speed. we usually only turn
stuff with infrequent drilling so this may be ongoing. i use a G96
S2000 to set the constant surface speed for OD turning, but when a 97
S700 M3 is put in it does not give 700rpm spindle speed. here is a
sample of the code:

%MPF50
G70 G90 G40 G54
(TOP-CAP 15-01-07 16:16 )
(TOOL - 1 OFFSET - 2)
(FACE TOOL)
T01 D02
G0 X1.65 Z0. M8
M3 S1000
G96 S1000
G1 X-.0713 F.005
....
....
(TOOL - 7 OFFSET - 12)
(9mm drill)
T07 D12
G97 S700 M3
G0 X0. Z.12 M8
G1 Z-.5 F.004
G0 Z0.
Z-.45
G1 Z-1. F.004
....


any assistance is appreciated.

Regards,

Chris