Upright Hammer Shank Length

[David Ilvedson]

Good idea but use a thread to tighten the fit...

David Ilvedson, RPT
Pacifica, California






Original message
From: "John Ross" 
To: "Pianotech List" 
Received: 4/3/2006 1:31:45 PM
Subject: Re: Upright Hammer Shank Length


Another idea that might work.
Put on a long hammer shank, and drill a spare hammer all the way through.
Then it can be slid, up or down. You could even have a screw tapped in the side of the hammer, that would contact the shank, to hold it secure.
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
----- Original Message ----- 
From: TOM DRISCOLL 
To: Pianotech List 
Sent: Monday, April 03, 2006 2:21 PM
Subject: Re: Upright Hammer Shank Length


 
Subject: Upright Hammer Shank Length


I'm installing a new action in an upright. I need to find the "sweet" spot up at C88 to determine how long to cut the shanks (determine strike point). Doing this on a grand piano is so easy by sliding the action in and out a bit and the hammer assembly can be glued nice and firm for good sound production. 
 
Does anyone have any suggestions on how to do this on an upright? If you move the action, the regulation changes, and if you have the hammer mobile, I fear it is too loose to really get a good sound. How do you folks do make this determination?
 
Terry Farrell
    
Terry,
    Thinking out loud here---How about a scrap butt @88 with a set screw on the side.Preglue the hammer on the shank,adjust for that "sweet spot " tighten and measure from the bottom of the hammer moulding to the top of the butt. 
    Add the depth of the hole(s) and there is your length.
    Might work.
    Tom Driscoll
  
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