What is the tool setting point for precision parts processing, and what are the selection principles?
The tool setting point refers to the starting point of the cutting movement of the tool relative to the part during the machining of precision parts. The following seven principles apply to the selection of tool setting point position:
1. Try to keep consistent with the dimension design datum or process datum of the workpiece.
2. The preparation of processing program shall be as simple and convenient as possible.
3. It is convenient to use conventional measuring tools and gauges for alignment on the machine tool.
4. At this time, the tool setting error should be small, otherwise the possible processing error should be minimum.
5. Try to make the lead in (or return) route in the processing program short and easy to change the rotary tool.
6. Select a position compatible with the agreed mechanical clearance state of the machine tool (eliminate or maintain the maximum clearance direction) to avoid causing (reverse compensation) when performing its automatic compensation.
7. If necessary, the tool set point can be set on an element of the workpiece or its extension, or on a position of the fixture that has a certain coordinate relationship with the workpiece positioning datum.
There are many methods to determine the position of tool setting point for precision parts processing. The machine tool with fixed origin can be determined through manual and display functions. For machine tools without fixed origin, displacement conversion algorithm and simulation positioning method or approximate positioning method can be used according to the determined accuracy requirements.