Advice on how to produce a good touch with the Blüthner action
in a Blüthner Grand

The fitting of the Blüthner-action is based on a touch-depth of 9,4 mm and on a hammer-blow of 45 mm.

1. The hammer-flange screws should be tightened. The hammer-heads must then be spaced exactly on the strings.

2. Setting-up
The jacks can be adjusted by means of the carriage which is screwed on the key It should fall quite easily under the nose on the abstract. The guide-pin of the abstract must be straight and vertical.

3. Set-off
The hammers should release 1,5 mm from the steel strings and half string thickness from the bass strings. The set-off screws for this adjustment are situated on the hammer rest rail.

4. Touch
Contrary to the ERARD action, the jack should be released from under the nose of the abstract when the key is lightly pressed on the touch baize. No after touch is necessary.

5. Checks
The hammers should be checked 24 mm above the hammer rest . The surface of the check is adjusted parallel to the hammer tail.

6. Drop
The right-angled repetition spring which controls the drop should have a thickness of 0,85 mm in treble, 0,95 mm in the middle range and 1 mm in the bass; the guide pin of the abstract must move freely in the bridge leather so that the abstract drops by its own weight. The repetition springs must move freely in the abstract felt clips .By bending the spring forward or back the tension is altered which controls the drop. The hammer head should drop to 3 mm from the steel strings.

7. Now the touch has to be checked again.

8. The dampers should lift when the keys are depressed 5 mm.

9. The height of the damper shade-rail should allow 1 mm play for the dampers when the white keys are depressed.

10. When the key is in rest position the leather button on the coiled spring which is attached to the abstract should be at 3 mm distance to the jack.
 
A even touch is of the greatest importance.