Cautions for the Custom CNC Milling on Seal Covers for Auto Motors
This custom CNC milling part requires two-time machining whose process needs to be handled with more care than that of one-time machining. Because the custom car parts is clamped twice, there must be an error due to repeated positioning. Therefore, the accuracy of custom car parts may be unstable during machining. To solve the problem of large repeated positioning error, Yijin Hardware suggests that a custom dedicated fixture be used for part clamping.
1)In order to keep directional consistency between the custom car parts setup orientation, the machine tool’s coordinate system, and the programming coordinate system, the fixture should provide guaranteed directional setup. A certain coordinate dimension relation is also required to be maintained between the part’s locating surface and the machine tool.
2)In order to keep all of the surfaces to be machined in this process fully exposed for the workpiece, the fixture should be made open as much as possible. Therefore, a certain safe distance should be kept between the clamping mechanism component and the surface to be machined, and the former is also required to be as low as possible. This is to avoid collision between the fixture and the milling machine tool’s spindle sleeve, cutter case or blade.
3)The fixture must have good rigidity and stability. Try not to use the design which requires the change of clamping points during machining. If it is inevitable, pay extra attention to avoiding the damage of fixture or tool positioning accuracy due to the change of clamping points.