车网纹是车削加工中一种常见的表面纹理，通常用于装饰或增加零件的摩擦力。下面是一个数控车网纹编程实例：
假设需要车削一个直径为 50mm 的圆柱形零件，零件表面需要加工出网纹，网纹的间距为 0.5mm，深度为 0.2mm。
G99 G97 S500 M3
T0101
G0 X52. Z2.
G94 X48. Z-20. F0.1
G94 X47.5 Z-20. F0.1
G94 X47. Z-20. F0.1
G94 X46.5 Z-20. F0.1
G94 X46. Z-20. F0.1
G94 X45.5 Z-20. F0.1
G94 X45. Z-20. F0.1
G94 X44.5 Z-20. F0.1
G94 X44. Z-20. F0.1
G94 X43.5 Z-20. F0.1
G94 X43. Z-20. F0.1
G94 X42.5 Z-20. F0.1
G94 X42. Z-20. F0.1
G94 X41.5 Z-20. F0.1
G94 X41. Z-20. F0.1
G94 X40.5 Z-20. F0.1
G94 X40. Z-20. F0.1
G94 X39.5 Z-20. F0.1
G94 X39. Z-20. F0.1
G94 X38.5 Z-20. F0.1
G94 X38. Z-20. F0.1
G94 X37.5 Z-20. F0.1
G94 X37. Z-20. F0.1
G94 X36.5 Z-20. F0.1
G94 X36. Z-20. F0.1
G94 X35.5 Z-20. F0.1
G94 X35. Z-20. F0.1
G94 X34.5 Z-20. F0.1
G94 X34. Z-20. F0.1
G94 X33.5 Z-20. F0.1
G94 X33. Z-20. F0.1
G94 X32.5 Z-20. F0.1
G94 X32. Z-20. F0.1
G94 X31.5 Z-20. F0.1
G94 X31. Z-20. F0.1
G94 X30.5 Z-20. F0.1
G94 X30. Z-20. F0.1
G94 X29.5 Z-20. F0.1
G94 X29. Z-20. F0.1
G94 X28.5 Z-20. F0.1
G94 X28. Z-20. F0.1
G94 X27.5 Z-20. F0.1
G94 X27. Z-20. F0.1
G94 X26.5 Z-20. F0.1
G94 X26. Z-20. F0.1
G94 X25.5 Z-20. F0.1
G94 X25. Z-20. F0.1
G94 X24.5 Z-20. F0.1
G94 X24. Z-20. F0.1
G94 X23.5 Z-20. F0.1
G94 X23. Z-20. F0.1
G94 X22.5 Z-20. F0.1
G94 X22. Z-20. F0.1
G94 X21.5 Z-20. F0.1
G94 X21. Z-20. F0.1
G94 X20.5 Z-20. F0.1
G94 X20. Z-20. F0.1
G94 X19.5 Z-20. F0.1
G94 X19. Z-20. F0.1
G94 X18.5 Z-20. F0.1
G94 X18. Z-20. F0.1
G94 X17.5 Z-20. F0.1
G94 X17. Z-20. F0.1
G94 X16.5 Z-20. F0.1
G94 X16. Z-20. F0.1
G94 X15.5 Z-20. F0.1
G94 X15. Z-20. F0.1
G94 X14.5 Z-20. F0.1
G94 X14. Z-20. F0.1
G94 X13.5 Z-20. F0.1
G94 X13. Z-20. F0.1
G94 X12.5 Z-20. F0.1
G94 X12. Z-20. F0.1
G94 X11.5 Z-20. F0.1
G94 X11. Z-20. F0.1
G94 X10.5 Z-20. F0.1
G94 X10. Z-20. F0.1
G94 X9.5 Z-20. F0.1
G94 X9. Z-20. F0.1
G94 X8.5 Z-20. F0.1
G94 X8. Z-20. F0.1
G94 X7.5 Z-20. F0.1
G94 X7. Z-20. F0.1
G94 X6.5 Z-20. F0.1
G94 X6. Z-20. F0.1
G94 X5.5 Z-20. F0.1
G94 X5. Z-20. F0.1
G94 X4.5 Z-20. F0.1
G94 X4. Z-20. F0.1
G94 X3.5 Z-20. F0.1
G94 X3. Z-20. F0.1
G94 X2.5 Z-20. F0.1
G94 X2. Z-20. F0.1
G94 X1.5 Z-20. F0.1
G94 X1. Z-20. F0.1
G94 X0.5 Z-20. F0.1
G0 X52. Z100.
M30
在上述示例中，G94 指令用于车削端面网纹，其中 X 表示终点直径，Z 表示终点坐标，F 表示进给速度。通过设置不同的 X 和 Z 坐标，可以在零件表面加工出网纹。
需要注意的是，上述示例中的网纹间距和深度是固定的，如果需要加工不同间距和深度的网纹，可以通过修改 X 和 Z 的坐标值来实现。同时，还需要根据实际加工要求选择合适的刀具和切削参数。
