The tool setting point refers to the starting point of the cutting motion of the tool relative to the part when the precision part is processed. The selection of the position of the knife point has the following seven principles:
- Try to be consistent with the size design benchmark or process benchmark of the workpiece.
- Try to use the simple and convenient preparation of processing program.
- It is convenient to use conventional measuring tools and measuring instruments for alignment on the machine tool.
- The tool setting error should be small at this time, otherwise the machining error that may be caused should be the smallest.
- Try to keep the lead-in (or return) route in the processing program as short as possible and facilitate the tool change.
- Choose a position compatible with the agreed mechanical gap state of the machine tool (eliminate or maintain the maximum gap direction) to avoid causing it when performing its automatic compensation (reverse compensation).
Direct observation method of tool setting point
- When necessary, the tool setting point can be set on a certain element of the workpiece or its extended part, or set on a certain position of a fixture that has a certain coordinate relationship with the workpiece positioning datum.
(Selection of knife point)
There are many ways to determine the position of the tool setting point for precision parts processing. The machine tool with a fixed origin can be determined by manual and display functions. For machine tools without a fixed origin, displacement conversion algorithms and simulation positioning methods or approximate positioning methods can be used according to the determined accuracy requirements.