Keyframe Bedding

[David Ilvedson]

The cheekblocks are in and tight, right?



David Ilvedson, RPT

Pacifica, CA 94044









Original message

From: "Jon Page" 

To: pianotech at ptg.org

Received: 7/7/2008 6:18:15 PM

Subject: Keyframe Bedding





I'm a little confused by the dimensions you give. You set the caliper for

.015 to .020 clearance, turn bolts up until the keys touch. Then you say

.010 is sufficient. Do you go for a range of .010 to .020?





Depending on the length of the key, you get differing key height effect from

stressing the frame. Start conservatively with .010".  Apply lift and tap the rail,

if knocking persists turn the bolt a little more then check your height for the

amount to set the next one, it might go to .010 or .020 +.   It was on the ends

of this key frame that it could only take a .010" rise as a little more and the

front rail knocked.

  

-- 





Regards,



Jon Page
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