Bluthner 1916 action

[Farrell]

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Hello Ola! I copied these regulating instructions for a Bluthner Patent =
Action from the web page of Barrie Heaton PGP (I think). I hope this =
helps. Good luck!  :-)   I love reading your posts. I can hear your =
Scandinavian accent!



The necessary operations must be carried out strictly in the following=20
order. The fitting of the BLUTHNER-action is based on a touch-depth of 9 =

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 jack must be so adjusted, by means of the carriage=20
which is screwed on to the key, that it drops quite easily under the=20
nose of the abstract. The guide-pin of the abstract must be straight and =

vertical

3. Let-off. The hammers should release 1,3 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 touch is made quite firm.=20
The key is depressed slowly on to the touch-baize, after which the=20
hammer should continue to rise 1 mm, till it releases, so that it checks =

only on striking the key strongly. (No after-touch).

5. Checks. The checks should be adjusted at a slightly greater angle=20
than on the ERARD action. The check point is 24 mm above the normal=20
hammer tail line.

6. Drop. The right-angled repetition spring which controls the drop=20
should have a thickness of 0,85 mm in treble, 0,95 mm in the middle=20
range and 1 mm in the bass; the guide pin of the abstract must move=20
easily in the bridge leathers so that the abstract drops of its own=20
weight. The repetition springs must move freely in the abstract felt=20
clips and by pressure of either side of the right-angle spring, the drop =

is controlled. The hammer head should release 3 mm from the steel=20
strings.

7, It is now necessary again to check the touch throughout.

8. The dampers should lift when the keys are half depressed.

9. The damper shade-rail must be adjusted in such a way that when=20
depressing the sharps, is very little play.

10. The coiled spring which is attached to the abstract should in the=20
normal position of the key not rest on the jack, but remain about 3 mm=20
from it. An even touch is of the greatest importance.



Bluthner-patented action

1. Hammer flange screw
2. Whippen
3. jack
4. Abstract
5. Hammer shank
6. Hammer-rest rail
7. Abstract-pin
8. Set?off dolly
9. Abstract-spring
10. jack-spring

there is a photo at
http://www.a440.co.uk/bluthner.jpg

Take note the dampers are velum hinges.

Barrie
--=20
Barrie Heaton PGP key on request http://www.a440.co.uk/
AcryliKey Ivory Repair System UK =A9 http://www.acrylikey.co.uk/
The U.K. Piano Page =A9 http://www.uk-piano.org/
Home to the UK Piano Industry


Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com
  ----- Original Message -----=20
  From: Ola Andersson=20
  To: pianotech@ptg.org=20
  Sent: Saturday, January 06, 2001 6:44 PM
  Subject: SV: Bluthner 1916 action



  Paul S. Larudee wrote


    Ola,=20
    You will no doubt observe that the hammer rest rail is NOT =
adjustable.  The hammer was not designed to rest on the rail.  Rather, =
the spring which you removed and then put back must be adjusted until it =
suspends the hammer at just the right distance=20

    Paul S. Larudee, RPT=20
    Richmond, CA=20

  But is there supposed to be lost motion or was it right to lift the =
jack up to the hammer?
  If it should be lost motion, how much?
  The Grand is sold to Malaysia and I'm affraid of lifting the bass =
hammers up from the restrail=20
  because the hammers can't go under the pinblock. Comments?

  Ola



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