Have you ever tried to print a document two-sided on a printer that doesnāt do it automatically? You need to manually turn the paper or flip the paper, and when you do, it usually doesnāt work out right the first time.
The same can happen when youāre machining on a two-sided item, which is why itās important to make sure that the position panels are always totally accurate. It can be hard to make this happen if you donāt have pop-up pins, but there are alternative ways to ensure accuracy.
Woodworking Network suggests starting with engraving a line around the outside of the spoil board with the CNC tool. After, surface the spoil board and clean up the line. Once youāve done this, itāll be much easier to locate sheets on your router with precision.
Another alternative, according to Wood Web, is to simply machine the more complicated side first in your nest and then to cut the perimeters. Once thatās finished, use pins if you have them as a home base to turn the parts over and cut.
Remember that just like when dealing with a paper printer, itās important to keep the orientation of the parts youāre machining in mind. Consider using a method for marking the orientation of the parts each time you use your CNC machine, that way youāll have a foolproof method.
You should keep your machineās calibration in mind as well. If you have pins and youāre working with a two-sided part, itās easier to use the pins as a starting point for both sides.
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