HF500 spindle speed during cycle

Hi,

I am sure this should be very easy answer for most of you. I am milling a sheet of aluminum about 1mm tick. I have created the profile in Vcarve. I bring it to stepcraft UCCNC software I start the spindle (HF500) at 60% but whenever the actual cycle starts it always goes to and stays at 10%.

I found that aluminum optimal cutting speed should be around 12000rpm or 60%.

What I am missing. How the speed on the HF500 should be set?

here is the code just in case:

( test )
( File created: Wednesday May 16 2018 - 11:18 AM)
( for Stepcraft 2 )
( Material Size)
( X= 220.000, Y= 330.000 ,Z= 1.000)
()
(Toolpaths used in this file:)
(Profile 1)
(Tools used in this file: )
(1 = test1)
N100G00G21G17G90G40G49G80
N110G71G91.1
N120T1M06
N130 (test1)
N140G00G43Z0.001H1
N150S255M03
N160(Toolpath:- Profile 1)
N170()
N180G94
N190X0.000Y0.000F180.0
N200G00X2.528Y0.901Z0.001
N210G00X2.528Y0.901Z0.000
N220G1X2.528Y0.901Z-0.250F60.0
N230G2X28.428Y-24.999I0.000J-25.900F180.0
N240G1X28.428Y-254.999Z-0.250
N250G2X2.528Y-280.898I-25.900J0.000
N260G1X-122.472Y-280.898Z-0.250
N270G2X-148.372Y-254.999I0.000J25.900
N280G1X-148.372Y-24.999Z-0.250
N290G2X-122.472Y0.901I25.900J0.000
N300G1X2.528Y0.901Z-0.250
N310G1X2.528Y0.901Z-0.500F60.0
N320G2X28.428Y-24.999I0.000J-25.900F180.0
N330G1X28.428Y-254.999Z-0.500
N340G2X2.528Y-280.898I-25.900J0.000
N350G1X-122.472Y-280.898Z-0.500
N360G2X-148.372Y-254.999I0.000J25.900
N370G1X-148.372Y-24.999Z-0.500
N380G2X-122.472Y0.901I25.900J0.000
N390G1X2.528Y0.901Z-0.500
N400G1X2.528Y0.901Z-0.750F60.0
N410G2X28.428Y-24.999I0.000J-25.900F180.0
N420G1X28.428Y-254.999Z-0.750
N430G2X2.528Y-280.898I-25.900J0.000
N440G1X-122.472Y-280.898Z-0.750
N450G2X-148.372Y-254.999I0.000J25.900
N460G1X-148.372Y-24.999Z-0.750
N470G2X-122.472Y0.901I25.900J0.000
N480G1X2.528Y0.901Z-0.750
N490G1X2.528Y0.901Z-1.000F60.0
N500G2X28.428Y-24.999I0.000J-25.900F180.0
N510G1X28.428Y-254.999Z-1.000
N520G2X2.528Y-280.898I-25.900J0.000
N530G1X-122.472Y-280.898Z-1.000
N540G2X-148.372Y-254.999I0.000J25.900
N550G1X-148.372Y-24.999Z-1.000
N560G2X-122.472Y0.901I25.900J0.000
N570G1X2.528Y0.901Z-1.000
N580G00X2.528Y0.901Z0.001
N590G00Z0.001
N600G00X0.000Y0.000
N610M09
N620M30
%

Thanks