[CAUT] Shimming the Steinway Action Stack

[David Love]

Good advice by Jon.  Especially the "start over" part.  Now to convince the
powers that be to let you do the work (and pay for it).  One of the issues
if you do start over will be choosing a set of hammers that will accommodate
the longer bore with adequate tail length.  It may not be a Steinway stock
hammer-not the worst thing.  

 

David Love

www.davidlovepianos.com

 

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Jon
Page
Sent: Friday, March 05, 2010 6:32 PM
To: caut at ptg.org
Subject: Re: [CAUT] Shimming the Steinway Action Stack

 

Left to right string height, measured at each break.

Bass 8&1/16" to 8&1/8"  Tenor 7&13/16 to 7&7/8  "alto" 7&7/8 to 8"  

treble (across the break) 7&15/16" to 7&7/8"


Looks like the plate is 1/4-3/8" too high.

 

Hammer Bore: bass 2&3/16"  tenor 1&13/16" to 1&3/4"


Stock hammer don't fit

 

Hammers were sanded and polished, presuming circa 1/16 to 3/32 wear

 

hammer tail length measured from center of shank to tail  bass 1&3/16" 

tenor up 1&1/16

 

Nice tail length

 

hammer shank flange center pin height 5&13/16" consistent

 

wippen center pin height 3&5/16"

 

HCH can be anywhere between 5 5/8" and 5 3/4", yours is already 1/16" higher

 

 

action spread 4&3/8"

 

Rick Baldassin recommends 112.75 mm which is 4.439 (yours is 3.375)

 

 

drop screw clearence below pinblock & stretcher >=5/32"

 

hammer blow distance varying from 2&1/16" to 1&15/16" in high treble

 

A far cry from 1 3/4 or 1 7/8 for a D

 

key dip is 7/16"

 

.437, yeah that's deep

 

Best to start over, completely :-) Or start by placing a sandpaper strip
above

the wippen screw to tip the flange center back.

 

Longer hammer fer shur,

 

I'm working on a 90's M where the action spread is 4.375 on A0 and

4.440 on C8. I'm placing a double thickness of sandpaper in the bass

and tenor and possibly one strip in T 1 & 2.

I have to check the first note in the top treble section for spread.

 

-- 


Regards,

Jon Page

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