[CAUT] Shimming the Steinway Action Stack

Jon Page jonpage at comcast.net
Fri Mar 5 19:32:11 MST 2010


>>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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/caut.php/attachments/20100305/40e26d99/attachment.htm>


More information about the CAUT mailing list

This PTG archive page provided courtesy of Moy Piano Service, LLC