Canned Cycles in Milling

There are times when a number of motions may have to be repeated without any change or with very small changes. In the case of drilling, the tool will be positioned at a position above the hole and then will be fed at feed rate to the depth and then brought back to the position above the hole at rapid as shown in Figure 14.

Figure 14: Typical Motions Embedded in G81 Canned Cycle

All these motions will have to be repeated at each of the hole. All the information given will have to be repeated except for the coordinates of the point where hole is being drilled. In such cases all the motions can be canned into a cycle such that a single statement or block could generate all the necessary motions without unnecessarily repeating the information. These are termed canned cycle or fixed cycle and would be generally useful for hole making operations such as drilling, counter sinking, reaming, boring and tapping.