[CAUT] Steinway repetition center pin height

[Zeno Wood]

Chris,
This is great information.  Do you have these numbers for a model B?  Is it
any different?
Thanks,
Zeno Wood

On 6/13/07, Chris Solliday <solliday at ptd.net> wrote:
>
>  sorry hit the send button by mistake,
> to continue
> ...5 1/8" from the centerpin of the hammershank flange to the center line
> of the hammer moulding.
> Also
> The action stack height, as determined by the thickness of the mounting
> blocks. This action height is unique for each instrument, and is the result
> of the individual string height for a piano. String height variables are the
> result of the plate fitting and belly operations.
> SET ADJUSTABLE GAUGE for the string height at note #62.
> the gauge is set up in such a way that the relationship between the action
> stack and the string height is maintained.
>  : this ensures, A) the proper BLOW distance at the same time the
> hammershank is properly off the rest cushion (just slightly).
>  : the proper HAMMER ROTATION is needed to minimize overstriking or
> shallow striking condition.
> DETERMINE NEEDED HEIGHT OF MOUNTING BLOCKS
> Plane bass and treble action mounting blocks so that the two flange
> centerpins are in alignment with the gauge's referance points.
> Fit center wedges so that the front and rear feet of each action hanger
> SLIGHTLY rests on the blocks, at the same time, maintaining the STRAIGHTNESS
> of the frame. Continually check for straightness with the straightedge on
> top of the hammershank flanges."
> That is from the horse's mouth.
> We have found that sometimes the mounting blocks have been trimmed by
> others or for other purposes such as stopping "catastrophic action failure."
> In general if you raise (shim) or lower (plane) the height at the center
> pin you should do the opposite to the front foot so as not to throw the
> hammer fore or aft. You want to rotate as you raise or lower. The pin is the
> pivot point.
> I hope this a help. The bore is expected to be 2 1/4" in the bass and 1
> 15/16" throughtout the treble. We do not find varying the bore to be a good
> idea, however, sometimes the strike line is not straight. Hammers could vary
> around the 5 1/8" spec.
> In other words vary the stack height before fudging anything else based on
> your string height average compared to spec.
>  If you would like more info, like current boring angles etc., let me
> know. I am leaving for KC tomorrow. And will not be able to help while I am
> there.
> Best of luck.
> Chris Solliday
>
> ----- Original Message -----
> *From:* David Brown <dcbrown5 at exchange.asu.edu>
> *To:* caut at ptg.org
> *Sent:* Tuesday, June 12, 2007 2:20 PM
> *Subject:* [CAUT] Steinway repetition center pin height
>
> Dear List--
>
> Anyone know offhand the spec for the center pin height from the key bed
> for a S&S rep? This is a relatively new model D. Or an even better question
> is – how to determine if an action stack is tipped front to back? We are re
> hammering our American and sample bore distances and subsequent regulation
> leave us wanting more.  We plan to continue on by checking convergence etc.
> Enquiring minds and all!
>
> Thanks in advance-
>
> David
>
>
> David C. Brown
> Arizona State University
> School of Music
> Piano Technician
> 1-480-965-6760
> david.c.brown.2 at asu.edu
>
>
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