bobble heads

[David Ilvedson]

Wim,

I believe the curvature of the backcheck should be about a 3.5 inch radius.
Make that curve on a piece of paper and hold it up against a hammer for comparison.
I think that is the single most important item in good checking. 

David I.

----- Original message ---------------------------------------->
From: Newton Hunt <nhunt@optonline.net>
To: College and University Technicians <caut@ptg.org>
Received: Tue, 15 Oct 2002 19:08:57 -0400
Subject: Re: bobble heads

>Hi Wim,

>Checking has more to do with tail length, contour, roughing and the
>backcheck leather, height and angle than regulation.

>Hammers:
>	Tail min. 3/4" from underside of shank
>	Contour, radius 1/2 the shank length, center to center
>	Roughed with 80 grit paper
>Backchecks:
>	Nice unworn, undry leather
>	Height set to 1/8" above shank at rest and 1/16" below tail at drop.
>	Angle set so hammer cannot be tapped past check but can be driven
>deeper with firmer taps, about 68 degrees from verticle.

>Make sure keys do not chuck.  Springs should not be overly strong.  Try
>new leather.

>Others may have other suggestions.

>		Newton
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>caut list info: https://www.moypiano.com/resources/#archives