[CAUT] 90 Degree Rake on Hammer Revamp

[Dale Erwin]

Hi Bob
 Put the back side, the flat side down on the platform. There should be enough flat surface left to represent the original flat surface. The result will be the same. 
 ASk me how I know?  Try boring just one and dry fit it.... you should discover it works.
 

 

Dale S. Erwin
www.Erwinspiano.com
Custom restoration
Ronsen Piano hammers
Join the Weickert felt Revolution
209-577-8397
209-985-0990



 

 

-----Original Message-----
From: Bob Hull <hullfam5 at yahoo.com>
To: caut at ptg.org
Sent: Tue, Feb 15, 2011 7:48 pm
Subject: [CAUT] 90 Degree Rake on Hammer Revamp


In the bass section hammers on a Steinway rebuild, the hammers did not get 

enough bore angle on the original drilling.   This was not noticed until the 

hammers had been arced.  Now after removing the shanks and plugging the hole, 

they need to be redrilled.  However, with the tails arced, they won't sit in the 



boring jig in a way that will enable a 90 degree rake.

I adapted the jig to line up the center line of the hammer core at a 90 degree 

angle but this still did not produce 90 deg., I guess because I'm still 

referencing off the rounded top of the hammer.



Any ideas on how to get the 90 degree. rake angle?  I think my jig is similar to 



the Brooks jig.  It works well for normal circumstances.  



Thanks,



Bob Hull





      


 
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