Pekka,
I am finding no information on an ID50 model from Tapmatic. My guess is that this is a CNC machine model. Manual models have a "rod" that screws into the body of the tapping head and rests against some solid feature of the mill to prevent the body from rotating (the closely coupled "up extension" off the side of the body should mate to a feature on a CNC spindle to accomplish the same thing). Also, manual models have a gear-set that reverses (and speeds up) the rotation when the spindle is raised. When the spindle on the head is manually spun, you should see the "chuck end" (A) rotate in the same direction and (B) rotate much more slowly than your "input speed." IF this is the case, then you will need to add a "feature" on the spindle of your mill or drill press to "catch" the "up extension" noted above.
That is my guess on the subject...