[CAUT] Upright geometry problem (Nordiska)

[Willem Blees]

Jim



I had a similar problem with a Brentwood piano, (about 15 years ago, and a very cheap Chinese product). Instead of moving the capstans back, I added cardboard balance punchings between the wippen rail and the bracket, to move all the wippen heals closer to the balance rail. I don't know if that will be enough on the Nordiska, but you could give it a try. (It's at least a lot easier than moving all the capstans, and it's reversible.) The other thing you might want to try, again, if there is enough room, is to add a little more felt to the jack stop on each butt.   

Willem (Wim) Blees, RPT
Piano Tuner/Technician
Honolulu, HI
Author of 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com


-----Original Message-----
From: Jim Busby <jim_busby at byu.edu>
To: College and University Technicians <caut at ptg.org>
Sent: Thu, 11 Oct 2007 9:20 am
Subject: [CAUT] Upright geometry problem (Nordiska)




List,

 

I’ve never had to do a major geometry tweaking of an upright, but this new Nordiska needs help and maybe you have some ideas;

 

Problem: Bobbling hammers due to not enough aftertouch (Hammers are bouncing off jack. No space between jack and buckskin on any blow)

 

As it stands here are the vital specs;

 

Blow 42mm (Too short)

Dip .450 (Way too deep)

Letoff 1/8” 

Checking 5/8”

(Lost motion has been regulated)

 

If I make the let off 3/8” to 1/2 “ it begins to work but this is obviously bad.

More dip would make it work… (Anyone have a 12.5 mm dip block??)

Less blow would also be ridiculous…

 

Seems like I need to move capstans back. No?

 

Any other wisdom out there?

 

Thanks,

Jim Busby BYU



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