'D' Designates the depth of the first cut, the depth automatically gets smaller as the thread is cut due to more material being removed on each pass. This information can be found in thread charts such as the charts available in my free ebook. The 'K' Value is used to tell the controls the depth of the tooth of the thread. This value can also be used to cut a tapered thread if required. This is adjusted during setup if the thread gauge is tight or lose at one end of the thread. We often need to add a taper to be able to cut a parallel thread especially if it is a long thread on a small diameter. 'I' tells the machine the amount of taper that is applied to the thread over the full length. ![]() We are assuming that the datum is on the front face of the part on our example. ![]() The Z dimension is the distance to the end of the thread from the datum position. The X dimension is the core diameter of the thread, the distance between the bottom of the thread tooth to the centreline multiplied by 2. This cycle contains a lot of information within the G76 line.
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