Does anyone here have strong feelings about the relationship between action stack height and string height in Steinway pianos? I seem to remember sometime ago there was a preference for the repetition center pin to be 4 1/2 inches below the strings I think this might have come from Dietz on Steinway regulation but it's been a long time and I can't be sure. i'm working on a model B action where the hammer shank center is about 3/32 inch higher than I would like and the repetition center is only 4 1/4 inches below the strings. In the current set up that would mean that I need a highly customized bore distance for the new hammers. I'm replacing all the action parts and I'm considering lowering the action stack but I'm not exactly sure how I'm going to thin the walnut support pieces. Just thought I'd throw this out there and see if I could entice the people who are smarter than me to weigh in.
------------------------------Karl RoederPompano Beach FL------------------------------
Thanks Mr Gravagne,
The string heights are around 192mm. A little higher in the mid-range and down to 190 at note 88. The stack is already a little too high from the factory (1967) as evidenced by a few notches from drop screws at the bottom of the cornice. The action comes out easy enough if you raise the middle three glide studs. With the original teflon era action parts, (16mm knuckle)the blow distance is between 49mm in the bass and 47mm in the top treble. At 48mm in the middle a 9mm touch depth gives 1mm aftertouch with 1mm letoff. I haven't run the numbers through AGP yet, but plan to tonight. I've just been thinking if I lower the stack by about wo millimeters. That I might be able to better accommodate a standard hammer bore distance and by using modern parts (17mm knuckle) get a more standard 10 mm touch.
Warning; Long winded post.
Thanks all for the replies.
It took some digging but I finally found the factory specs for stack height.
Apparently this level of tomfoolery has left Mr. Gravagne speechless.