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四川读者来信问:从日本引进的推土机中的起动小齿轮,经长期使用已碎成三块,其外部是变位齿轮,内孔是渐开线螺旋内花键。在无专用设备的情况下能否加工这一零件,请给予解答。
Letter from Sichuan Reader Q: The starter pinion in a bulldozer imported from Japan has been broken into three pieces after long-term use. The outer part is a change gear, and the inner hole is an involute helical internal spline. In the absence of special equipment can process this part, please give answer.