In the manual model processing, the spindle should also have a broach system to load and unload tools, which is generally divided into hydraulic, pneumatic and mechanical. Following the traditional manual model machine tool tool loading method, the mechanical type only uses a screw through the spindle to tighten the tool. Its power comes from the broach motor at the tail of the spindle. The pull is torque monitored. When the broach pull reaches the set value, the tool mode will close. Compared with the front tool, there is no need to pull the nail.

而手办模型机械加工数控机床的液压与气压拉刀机构都比较烦琐，机械零件加工厂在主轴尾部既要装拉刀油缸，又要安装主轴喷雾、喷水、喷气机构，在设计制造上成本会高出很多。

The hydraulic and pneumatic broaching mechanisms of the machine tool CNC machine tools are rather cumbersome. The mechanical parts processing plant has to install the broach cylinder at the rear of the spindle, and also install the spindle spray, spray and jet mechanism. The cost will be much higher in design and manufacture.
               

手办模型加工指出，对于液压装刀，须要配置拉爪，从前到后这个拉杆都是中空的，因为它要考虑主轴内冷的设计。拉爪是4个靠弹簧顶开的爪瓣，靠在斜面上前后移动以达到收紧与张开，从而实现刀具的装卸。

Manual model processing experts pointed out that for hydraulic loading, it is necessary to configure the claw. The pull rod from the front to the back is hollow, because it needs to consider the design of internal cooling of the spindle. The pulling claws are four claw petals pushed open by springs, which move back and forth on the inclined plane to achieve tightening and opening, so as to realize the loading and unloading of cutting tools.

在手办模型加工的实际应用中，刀具有时候会松，如果确认刀具拉钉没有松的话，就是拉爪松了，操作人员可以给它拧紧，但要自制一个小工具。因为拉爪后边都有一个调整拉爪前后位置的螺帽，它是可以旋紧的，做成一个可以旋紧它的长柄小叉子，这样问题就解决了。

In the practical application of manual model processing, the cutting tool is sometimes loose. If it is confirmed that the pulling nail of the cutting tool is not loose, the claw is loose. The operator can tighten it, but a small tool should be made by himself. Because there is a nut at the back of the claw to adjust the front and rear position of the claw, it can be tightened to make a long handle fork that can be tightened, so the problem is solved.