The taper clamp on the shaft is brilliantly designed, and does its job well. It is VERY tight, when it is supposed to be. Once you get the arm down, loosen all the cap screws, on the clamp ring, and slide it up the shaft. You will also need to spin the large bottom nut to back off the pressure from below. Just don't remove the large nut completely. You can mark the arm position on the shaft if you want. Mark/ lightly scribe it UNDER the arm. Then it takes some liquid wrench, or other penetrating oil, and lots and LOTS of tapping on the arm to free the taper rings.
To remove the arm from the shaft, you need to remove the large shaft nut, and the tool lock pins, etc... Don't remove the arm if you don't have to.
The trick is tightening clamp ring back.
Obviously the machine has to be on. And MAKE sure the z-axis is at z-zero!!!
Replace two of the cap screws in the shaft clamp with hex head bolts, you can put the other caps screws in, but leave them loose. Then raise the arm. Rotate the arm into position, and use the large nut to set the correct height. Tighten the 2 hex head bolts, as tight as you feel you can. The arm should be tight on the shaft. Then lower the arm, tighten the 4 other cap screws, remove the hex head bolts, and replace the last 2 cap screws. If you did it right, you won't have to adjust anything. I should be easier, to loosen the taper clamp, if you need to do it again.  |