I picked up a nice used 2536 Velox cnc, The Velox site says you can use vectric 2d software but not sure which post processor to use.. the guy i got it from said its set up for MACH3 and to try MACH3 INCH TAP and that came up as a text and not nc file so it wouldn't read it. which PP should i use from the Vcarve drop down ? thanks