S&S action numbers

[David Ilvedson]

Conrad,

I suggest you buy a simple tape recorder for things like this...it is very
nice to replay and pickup tips you missed...

David I.

*********** REPLY SEPARATOR  ***********

On 10/30/01 at 10:54 AM Conrad Hoffsommer wrote:

>Cauterizers/roasters,
>
>Houston, we have a problem....
>
>[yes, I did try searching the archives, but couldn't find this specific 
>method of evaluation.]
>
>I don't have fancy gram scales, so I haven't been doing stuff by the 
>Stanwood system, BUT... at our last chapter meeting we went over total 
>mechanical advantage.  Basically, multiplying the lever ratios of the
>three 
>levers of the action.  Since then I've been trying to make sense of it and

>some of the possible ramifications of stuff I've found.
>
>In our recital hall we have two D's. I want to replace hammers, shanks and

>wippens on the new yorker and have been trying make sure I order the right

>ones. Duh...
>
>Lately, I've also gotten reports that it seems hard to get sound out of
>the 
>(new to us)hamburger.
>
>I'm not a stenographer, so I didn't write down everything which was said
>in 
>the technical, but one thing I DID was that the magic number range for an 
>action to work and feel right is between .152 and .158.
>
>Today I measured both pianos.
>
>1949 NYC S&S D
>#1 - .153
>#88- .1486
>
>1984 Ham S&S D
>#1 - .1692
>#88- .1689
>
>The big difference I see is the knuckle/flange pin distance.  The
>hamburger 
>has 17.5mm!
>
>Re: Hamburger
>If I plug in the NY pre-'84 spec of 16mm, the numbers become:
>#1 - .1547
>#88- .1544
>Beautifully inside of the zone...
>
>Can I assume that the high number signifies that an action will play like
>a 
>truck?
>
>If 16mm shanks were put in there, wouldn't the touchweight increase 
>dramatically?
>{Incidentally, my Renner kit only has 16mm and 17mm choices, where did 
>these 17.5s come from?}
>
>Re: NYC
>I have a set of wippens which I am contemplating putting into the 
>NYC.  They appear to be Hamb specs (straight heel, 99mm flange-jack
>centers)
>
>Plugging in those nummers the NYC goes from .153/.148  to .155/.154. 
>Would 
>that feel significantly different?  If the numbers are so similar, would
>it 
>feel more consistant than original, or is there supposed to be a dropoff, 
>like touchweight?
>
>BTW, earlier this year I did substitute the straight heel for the original

>slant and saw a negligible difference in touchweight.  What problems am I 
>asking for if I change them?
>
>Feeling betwixt a rock and a hard place.
>
>
>Conrad Hoffsommer - Music Technician -mailto:hoffsoco@luther.edu
>Luther College, 700 College Drive, Decorah, Iowa 52101-1045
>Voice-(563)-387-1204  //  Fax (563)-387-1076(Dept.office)
>=== Note new area code ===
>
>"Reality continues to ruin my life." - Calvin and Hobbes