I have the Sinumerik 828D post processor for SolidCAM. And I provide the service for post processor writing/customizing on 3 - Axis mill for NX CAM & SolidCAM.

Following attached the sample g-code file from sinumerik post that write for SolidCAM

You can contact me here (reply with your email) for post process requirements. I would charge $150 for the general 3 axis post process.

; Machine   : 
; Controller: Sinumeric 828D
; PART NAME : MILLING PART
; WORKPIECE : x=216. y=216. z=50.

; TOOL USED
;T2 = Flat End Mill 12 mm

G90 G710 G54 G17 
G94 G64 
FFWON
SOFT
STOPRE
G642
;TOOL CHANGE

N1 T2 ="Flat End Mill 12 mm"
N2 M06 
N3 ;OPERATION : P-contour
N4 G00 G54 G90 X82.7297 Y-87.2 S2100 M03 
N5 Z70. 
N6 Z50. 
N7 Z2. 
N8 G03 G40 X82.7297 Y-87.2 Z0.9249 I0. J4.9 F420. 
N9 X82.7297 Y-87.2 Z-0.1503 I0. J4.9 
N10 X82.7297 Y-87.2 Z-1.2254 I0. J4.9 
N11 X82.7297 Y-87.2 Z-2.3005 I0. J4.9 
N12 X82.7297 Y-87.2 Z-3.3756 I0. J4.9 
N13 X82.7297 Y-87.2 Z-4.4508 I0. J4.9 
N14 X82.3956 Y-77.4114 Z-5. I0. J4.9 
N15 X82.3956 Y-77.4114 I0.3341 J-4.8886 
N16 X82.7297 Y-87.2 I0.3341 J-4.8886 
N17 G01 Y-94.2 
N18 X94.2 
N19 Y-62.7742 
N20 G02 X62.7742 Y-94.2 I-94.2 J62.7742 
N21 G01 X82.7297 
N22 Y-101.2 
N23 X101.2 
N24 Y-32.2025 
N25 G02 X32.2025 Y-101.2 I-101.2 J32.2025 
N26 G01 X82.7297 
N27 X7.7271 Y-105.9285 
N28 G02 X-102.3165 Y28.4938 I-7.7271 J105.9285 
N29 G01 X-87.2 Y82.7297 
N30 G02 X-82.7297 Y87.2 I87.2 J-82.7297 
N31 G01 X-87.2 
N32 Y82.7297 
N33 X-94.2 
N34 Y62.7742 
N35 G02 X-62.7742 Y94.2 I94.2 J-62.7742 
N36 G01 X-94.2 
N37 Y82.7297 
N38 X-101.2 
N39 Y32.2025 
N40 G02 X-32.2025 Y101.2 I101.2 J-32.2025 
N41 G01 X-101.2 
N42 Y82.7297 
N43 X-105.95 Y7.4272 
N44 G03 X-102.5699 Y-27.5676 I105.95 J-7.4272 
N45 G01 X-87.2 Y-82.7297 
N46 Y-87.2 
N47 X-82.7297 
N48 G02 X-87.2 Y-82.7297 I82.7297 J87.2 
N49 G01 X-94.2 
N50 Y-94.2 
N51 X-62.7742 
N52 G02 X-94.2 Y-62.7742 I62.7742 J94.2 
N53 G01 Y-82.7297 
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N58 G01 Y-82.7297 
N59 X-105.9285 Y-7.7271 
N60 G02 X28.4938 Y102.3165 I105.9285 J7.7271 
N61 G01 X82.7297 Y87.2 
N62 G02 X87.2 Y82.7297 I-82.7297 J-87.2 
N63 G01 Y87.2 
N64 X82.7297 
N65 Y94.2 
N66 X62.7742 
N67 G02 X94.2 Y62.7742 I-62.7742 J-94.2 
N68 G01 Y94.2 
N69 X82.7297 
N70 Y101.2 
N71 X32.2025 
N72 G02 X32.2025 Y101.2 I-32.2025 J-101.2 
N73 X101.2 Y32.2025 I-32.2025 J-101.2 
N74 G01 Y101.2 
N75 X82.7297 
N76 Y108.2 
N77 X-108. 
N78 G03 X-108.2 Y108. I0. J-0.2 
N79 G01 Y-108. 
N80 G03 X-108. Y-108.2 I0.2 J0. 
N81 G01 X108. 
N82 G03 X108.2 Y-108. I0. J0.2 
N83 G01 Y108. 
N84 G03 X108. Y108.2 I-0.2 J0. 
N85 G01 X82.7297 
N86 G03 X81.3155 Y107.6142 I0. J-2. 
N87 G01 X82.7297 Y106.2 
N88 G00 Z50. 
N89 Y-87.2 
N90 Z-3. 
N91 G03 X82.7297 Y-87.2 Z-4.0751 I0. J4.9 F420. 
N92 X82.7297 Y-87.2 Z-5.1503 I0. J4.9 
N93 X82.7297 Y-87.2 Z-6.2254 I0. J4.9 
N94 X82.7297 Y-87.2 Z-7.3005 I0. J4.9 
N95 X82.7297 Y-87.2 Z-8.3756 I0. J4.9 
N96 X82.7297 Y-87.2 Z-9.4508 I0. J4.9 
N97 X82.3956 Y-77.4114 Z-10. I0. J4.9 
N98 X82.3956 Y-77.4114 I0.3341 J-4.8886 
N99 X82.7297 Y-87.2 I0.3341 J-4.8886 
N100 G01 Y-94.2 
N101 X94.2 
N102 Y-62.7742 
N103 G02 X62.7742 Y-94.2 I-94.2 J62.7742 
N104 G01 X82.7297 
N105 Y-101.2 
N106 X101.2 
N107 Y-32.2025 
N108 G02 X32.2025 Y-101.2 I-101.2 J32.2025 
N109 G01 X82.7297 
N110 X7.7271 Y-105.9285 
N111 G02 X-102.3165 Y28.4938 I-7.7271 J105.9285 
N112 G01 X-87.2 Y82.7297 
N113 G02 X-82.7297 Y87.2 I87.2 J-82.7297 
N114 G01 X-87.2 
N115 Y82.7297 
N116 X-94.2 
N117 Y62.7742 
N118 G02 X-62.7742 Y94.2 I94.2 J-62.7742 
N119 G01 X-94.2 
N120 Y82.7297 
N121 X-101.2 
N122 Y32.2025 
N123 G02 X-32.2025 Y101.2 I101.2 J-32.2025 
N124 G01 X-101.2 
N125 Y82.7297 
N126 X-105.95 Y7.4272 
N127 G03 X-102.5699 Y-27.5676 I105.95 J-7.4272 
N128 G01 X-87.2 Y-82.7297 
N129 Y-87.2 
N130 X-82.7297 
N131 G02 X-87.2 Y-82.7297 I82.7297 J87.2 
N132 G01 X-94.2 
N133 Y-94.2 
N134 X-62.7742 
N135 G02 X-94.2 Y-62.7742 I62.7742 J94.2 
N136 G01 Y-82.7297 
N137 X-101.2 
N138 Y-101.2 
N139 X-32.2025 
N140 G02 X-101.2 Y-32.2025 I32.2025 J101.2 
N141 G01 Y-82.7297 
N142 X-105.9285 Y-7.7271 
N143 G02 X28.4938 Y102.3165 I105.9285 J7.7271 
N144 G01 X82.7297 Y87.2 
N145 G02 X87.2 Y82.7297 I-82.7297 J-87.2 
N146 G01 Y87.2 
N147 X82.7297 
N148 Y94.2 
N149 X62.7742 
N150 G02 X94.2 Y62.7742 I-62.7742 J-94.2 
N151 G01 Y94.2 
N152 X82.7297 
N153 Y101.2 
N154 X32.2025 
N155 G02 X32.2025 Y101.2 I-32.2025 J-101.2 
N156 X101.2 Y32.2025 I-32.2025 J-101.2 
N157 G01 Y101.2 
N158 X82.7297 
N159 Y108.2 
N160 X-108. 
N161 G03 X-108.2 Y108. I0. J-0.2 
N162 G01 Y-108. 
N163 G03 X-108. Y-108.2 I0.2 J0. 
N164 G01 X108. 
N165 G03 X108.2 Y-108. I0. J0.2 
N166 G01 Y108. 
N167 G03 X108. Y108.2 I-0.2 J0. 
N168 G01 X82.7297 
N169 G03 X81.3155 Y107.6142 I0. J-2. 
N170 G01 X82.7297 Y106.2 
N171 G00 Z50. 
N172 Y-87.2 
N173 Z-8. 
N174 G03 X82.7297 Y-87.2 Z-9.0751 I0. J4.9 F420. 
N175 X82.7297 Y-87.2 Z-10.1503 I0. J4.9 
N176 X82.7297 Y-87.2 Z-11.2254 I0. J4.9 
N177 X82.7297 Y-87.2 Z-12.3005 I0. J4.9 
N178 X82.7297 Y-87.2 Z-13.3756 I0. J4.9 
N179 X82.7297 Y-87.2 Z-14.4508 I0. J4.9 
N180 X82.3956 Y-77.4114 Z-15. I0. J4.9 
N181 X82.3956 Y-77.4114 I0.3341 J-4.8886 
N182 X82.7297 Y-87.2 I0.3341 J-4.8886 
N183 G01 Y-94.2 
N184 X94.2 
N185 Y-62.7742 
N186 G02 X62.7742 Y-94.2 I-94.2 J62.7742 
N187 G01 X82.7297 
N188 Y-101.2 
N189 X101.2 
N190 Y-32.2025 
N191 G02 X32.2025 Y-101.2 I-101.2 J32.2025 
N192 G01 X82.7297 
N193 X7.7271 Y-105.9285 
N194 G02 X-102.3165 Y28.4938 I-7.7271 J105.9285 
N195 G01 X-87.2 Y82.7297 
N196 G02 X-82.7297 Y87.2 I87.2 J-82.7297 
N197 G01 X-87.2 
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N199 X-94.2 
N200 Y62.7742 
N201 G02 X-62.7742 Y94.2 I94.2 J-62.7742 
N202 G01 X-94.2 
N203 Y82.7297 
N204 X-101.2 
N205 Y32.2025 
N206 G02 X-32.2025 Y101.2 I101.2 J-32.2025 
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N208 Y82.7297 
N209 X-105.95 Y7.4272 
N210 G03 X-102.5699 Y-27.5676 I105.95 J-7.4272 
N211 G01 X-87.2 Y-82.7297 
N212 Y-87.2 
N213 X-82.7297 
N214 G02 X-87.2 Y-82.7297 I82.7297 J87.2 
N215 G01 X-94.2 
N216 Y-94.2 
N217 X-62.7742 
N218 G02 X-94.2 Y-62.7742 I62.7742 J94.2 
N219 G01 Y-82.7297 
N220 X-101.2 
N221 Y-101.2 
N222 X-32.2025 
N223 G02 X-101.2 Y-32.2025 I32.2025 J101.2 
N224 G01 Y-82.7297 
N225 X-105.9285 Y-7.7271 
N226 G02 X28.4938 Y102.3165 I105.9285 J7.7271 
N227 G01 X82.7297 Y87.2 
N228 G02 X87.2 Y82.7297 I-82.7297 J-87.2 
N229 G01 Y87.2 
N230 X82.7297 
N231 Y94.2 
N232 X62.7742 
N233 G02 X94.2 Y62.7742 I-62.7742 J-94.2 
N234 G01 Y94.2 
N235 X82.7297 
N236 Y101.2 
N237 X32.2025 
N238 G02 X32.2025 Y101.2 I-32.2025 J-101.2 
N239 X101.2 Y32.2025 I-32.2025 J-101.2 
N240 G01 Y101.2 
N241 X82.7297 
N242 Y108.2 
N243 X-108. 
N244 G03 X-108.2 Y108. I0. J-0.2 
N245 G01 Y-108. 
N246 G03 X-108. Y-108.2 I0.2 J0. 
N247 G01 X108. 
N248 G03 X108.2 Y-108. I0. J0.2 
N249 G01 Y108. 
N250 G03 X108. Y108.2 I-0.2 J0. 
N251 G01 X82.7297 
N252 G03 X81.3155 Y107.6142 I0. J-2. 
N253 G01 X82.7297 Y106.2 
N254 G00 Z50. 
N255 Y-87.2 
N256 Z-13. 
N257 G03 X82.7297 Y-87.2 Z-14.0751 I0. J4.9 F420. 
N258 X82.7297 Y-87.2 Z-15.1503 I0. J4.9 
N259 X82.7297 Y-87.2 Z-16.2254 I0. J4.9 
N260 X82.7297 Y-87.2 Z-17.3005 I0. J4.9 
N261 X82.7297 Y-87.2 Z-18.3756 I0. J4.9 
N262 X82.7297 Y-87.2 Z-19.4508 I0. J4.9 
N263 X85.1482 Y-78.0384 Z-19.9 I0. J4.9 
N264 X85.1482 Y-78.0384 I-2.4185 J-4.2616 
N265 X82.7297 Y-87.2 I-2.4185 J-4.2616 
N266 G01 Y-94.2 
N267 X94.2 
N268 Y-62.7742 
N269 G02 X62.7742 Y-94.2 I-94.2 J62.7742 
N270 G01 X82.7297 
N271 Y-101.2 
N272 X101.2 
N273 Y-32.2025 
N274 G02 X32.2025 Y-101.2 I-101.2 J32.2025 
N275 G01 X82.7297 
N276 X7.7271 Y-105.9285 
N277 G02 X-102.3165 Y28.4938 I-7.7271 J105.9285 
N278 G01 X-87.2 Y82.7297 
N279 G02 X-82.7297 Y87.2 I87.2 J-82.7297 
N280 G01 X-87.2 
N281 Y82.7297 
N282 X-94.2 
N283 Y62.7742 
N284 G02 X-62.7742 Y94.2 I94.2 J-62.7742 
N285 G01 X-94.2 
N286 Y82.7297 
N287 X-101.2 
N288 Y32.2025 
N289 G02 X-32.2025 Y101.2 I101.2 J-32.2025 
N290 G01 X-101.2 
N291 Y82.7297 
N292 X-105.95 Y7.4272 
N293 G03 X-102.5699 Y-27.5676 I105.95 J-7.4272 
N294 G01 X-87.2 Y-82.7297 
N295 Y-87.2 
N296 X-82.7297 
N297 G02 X-87.2 Y-82.7297 I82.7297 J87.2 
N298 G01 X-94.2 
N299 Y-94.2 
N300 X-62.7742 
N301 G02 X-94.2 Y-62.7742 I62.7742 J94.2 
N302 G01 Y-82.7297 
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N305 X-32.2025 
N306 G02 X-101.2 Y-32.2025 I32.2025 J101.2 
N307 G01 Y-82.7297 
N308 X-105.9285 Y-7.7271 
N309 G02 X28.4938 Y102.3165 I105.9285 J7.7271 
N310 G01 X82.7297 Y87.2 
N311 G02 X87.2 Y82.7297 I-82.7297 J-87.2 
N312 G01 Y87.2 
N313 X82.7297 
N314 Y94.2 
N315 X62.7742 
N316 G02 X94.2 Y62.7742 I-62.7742 J-94.2 
N317 G01 Y94.2 
N318 X82.7297 
N319 Y101.2 
N320 X32.2025 
N321 G02 X32.2025 Y101.2 I-32.2025 J-101.2 
N322 X101.2 Y32.2025 I-32.2025 J-101.2 
N323 G01 Y101.2 
N324 X82.7297 
N325 Y108.2 
N326 X-108. 
N327 G03 X-108.2 Y108. I0. J-0.2 
N328 G01 Y-108. 
N329 G03 X-108. Y-108.2 I0.2 J0. 
N330 G01 X108. 
N331 G03 X108.2 Y-108. I0. J0.2 
N332 G01 Y108. 
N333 G03 X108. Y108.2 I-0.2 J0. 
N334 G01 X82.7297 
N335 G03 X81.3155 Y107.6142 I0. J-2. 
N336 G01 X82.7297 Y106.2 
N337 G00 Z50. 
N338 M05 G91 Z0 G91 X-15.0 Y0. 
N339 M09
N340 M30