Christian Brothers Piano Tuning
Home
Clientele
QUESTIONS?
REWARDS!
Contact Information
Grand Piano Mechanics
Upright Mechanics
Listen!

Grand Piano Action Mechanism Diagram

GRAND ACTION DRAWING

NUMERICAL KEY

1 String
2 Damper head
3 Damper felt
4 Damper guide rail
5 Damper wire
6 Hammer
7 Hammer shank
8 Drop screw
9 Hammer flange
10 Main action rail
11 Damper stop rail
12 Damper lifterflange
13 Damper wire screw
14 Sostenuto rod
15 Backcheck
16 Hammer rest*
17 Repetition leverscrew
18 Repetition lever flange
19 Repetition lever
20 Hammer knuckle
21 Repetition lever button
22 Whippen spoon
23 Combination jack
24 Whippen
25 Jack regulatingbutton
26 jack regulating screw
27 Letoffregulating screw
28 Letoff rail
29 Letoff button
30 Letoff buttonpunching
31 Jack
32 Action bracket
33 Damper leverflange
34 Damper lift rail spring
35 Sostenuto tab orlip
36 Damper lever
37 Damper lever key cushion
38 Backcheck wire
39 Whippen flange
40 Whippen rail
41 Whippen cushion
42 Capstan screw
43 Key button
44 Balance rail key pin
45 Key
46 Key stop rail
47 Damper lift rail
48 Back rail
49 Back rail cloth
50 Key frame
51 Balance rail
52 Balance rail bearing***
53 Key stop rail prop
54 Front rail key pin
55 Front rail punching
56 Front rail

Grand piano action
ALPHABETICAL-KEY


Actionbracket32
Backrail48
Backrailcloth49
Backcheck15
Backcheckwire38
Balancerail51
Balancerailbearing***52
Balancerailkeypin44
Capstanscrew42
Damperfelt3
Damperguiderail4
Damperhead2
Damperlever36
Damperleverflange33
Damperleverkeycushion37
Damperliftrail.47
Damperliftrailspring34
Damperlifterflange12
Damperstoprail11
Damperwire5
Damperwirescrew13
Dropscrew8
Frontrail56
Frontrailkeypin
Frontrailpunching
Hammer
Hammerflange
Hammerknuckle

Hammerrest*
Hammershank
Jack
Jackregulatingbutton
Jackregulatingscrew
Jackspring**
Key
Keybutton
Keyframe
Keystoprail
Keystoprailprop
Letoffbutton
Letoffbuttonpunching
Letoffrail
Letoffregulatingscrew
Mainactionrail
Repetitionlever
Repetitionleverbutton
Repetitionleverflange
Repetitionleverscrew
Repetitionleverspring**
Sostenutorod
Sostenutotaborlip
String
Whippen
Whippencushion
Whippenflange
Whippenrail
Whippenspoon

The hammer rest is built into the Steinway-style whippen. Other actions have a separate hammer rail located in the same position.

**These are two separate springs in many actions.

***The Steinway balance rail bearings take the place of the usual cloth punchings.