Downbearing

[David ilvedson]

John,

What you want to see with the gauge is "some" bearing.  The 
actual amounts are not so important unless you are in the 
process of restringing and pulling the plate etc. and I wouldn't 
know what rebuilders shoot for in that respect.  I would guess 
minimal bearing under load?  In the field I rarely check 
bearing unless I hear a problem or I'm being hired for 
inspection.  For an inspection I will simply mention that the 
piano has some bearing and the board still has some crown or 
that it has negative bearing etc.  

David Ilvedson, RPT
Pacifica, CA


> Date:          Sun, 28 Jun 1998 19:11:10 -0300
> From:          John Ross <piano.tech@ns.sympatico.ca>
> To:            pianotech@ptg.org
> Subject:       Downbearing
> Reply-to:      pianotech@ptg.org

> List,
> On the use of the three legged guage #16397 in APSCO's catalogue, or
> similar type guage, I can see how to determine positive or negative
> downbearing. But how much is enough, I can see how using a feeler guage,
> allows you to compare sections.  Is there a table available that gives
> the information, as to what the minimum and maximum should be?
> The other question, it seems some people measure the speaking length and
> some the other. What is correct?
> Regards,
> John M. Ross
> PTG Assoc.
> Windsor, Nova Scotia, Canada.
> 
> 
>