[CAUT] Upright geometry problem (Nordiska)

[Jim Busby]

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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