Precision machining tells you the difference between hand board and first board! And how to avoid the accident of crashing knives in CNC machining!
Essentially, the hand board and the first board is the same, belong to the engineering model prototype, and through the computer way to draw out, however, there are subtle differences between the two.
The word "hand board" originated in the 1990s and was introduced from Taiwan. Handboard is also divided into oil clay handboard and plaster handboard, when the industrialization process is relatively backward, 90% of the process needs to rely on hand to complete, so it is called handboard. However, due to the long production period and the immaturity of the process, it was difficult to apply color, so the handboard was limited to the shape of the product. And the first board, as the name implies, in the "first" word, the meaning. With the gradual maturation of industrialization, the hand board and the first board gradually assimilated into two general terms, to today, the hand board is divided into: SLA hand board and CNC hand board, the obvious difference between the two manifested in the processing method, the former is to increase the consumption of processing, the latter is to reduce the consumption of processing.
The incident of knife collision is traceable. After actual testing, due to the difficulty and high cost of machining center maintenance, and processing parts mainly rely on machine precision to ensure that once the equipment accident, machine precision will be seriously reduced. In fact, to avoid the method is also very simple, in the simulation of machining before, should first confirm whether the machine is locked. Again, after the empty run simulation to check whether to return to the reference point, because in the inspection program, the coordinates do not match the actual position, this time must be used to return to the reference point to ensure the consistency of the coordinates. In the specified line of operation, in Dongguan CNC machining center must first call the coordinate system such as machining center must first call the coordinate system such as G54 and the length compensation value of the knife. Because the length compensation value of each knife is not the same, if not called may also cause a collision knife.