下图所示齿轮坯的内孔和外孔已加工合格，即<img src="https://nimg.ppkao.com/2018-08/lina/2018082911330777087.jpg?sign=5cf8a73e677ea7d66dcb467ccd37396e&t=62d05bb3" />，<img src="https://nimg.ppkao.com/2018-08/lina/2018082911331144549.jpg?sign=6838e7e56bc6e729d698640228fe0d06&t=62d05bb3" />。现在插床上用调整法加工内键槽，要求保证尺寸<img src="https://nimg.ppkao.com/2018-08/lina/2018082911330381786.jpg?sign=71f5fecf226b7b5e9bcfbd09faec377c&t=62d05bb3" />。忽略内孔与外圆同轴度误差，试计算该定位方案能否满足加工要求？若不能满足，应如何改进？<br /> <img src="https://nimg.ppkao.com/2018-08/lina/2018082911332330937.jpg?sign=9a9e7d66449719615d9ab8100c405e65&t=62d05bb3" />&ensp;