Round hole teaching, which in a frame 1 a first rotatable disk 2 which has an eccentrically adjustable holding device for a cutting tool 5, such as, preferably, a further rotatable of smaller diameter than the second disk 3 which has a receiving device for a cutting tool 5 has in the form of a recess, whereby this further smaller second disk 3 eccentrically in the first disc 2 is arranged, wherein preferably the second disk 3 at least one receiving device for a cutting tool 5 in the form of a recess which, through the center or directly on the center of the first disk 2 can be arranged or the second disk 3 can also be designed as a virtual disk and thus fixed component of the first disc 2 and on this can be arbitrarily large amount of recesses, that is, as many as spatially be used for receiving a cutting tool 5, preferably circular, or can be arranged the first rotatable disk has an oval recess 6 (downwardly open or closed) from the center up to the edge of the first disk, wherein the oval recess 6 a along the oval recess 6 arranged adjustable holding device has for a cutting tool 7.
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