[pianotech] measuring action ratios

[David Love]

Here are two photos.

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Tuesday, January 15, 2013 9:13 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] measuring action ratios

A simple block of wood with an extension (mine is a machine screw) that lays
across the keys and  that depresses a key exactly 6 mm whereby you then
measure the amount of hammer travel and divide that by six to give the
action ratio.  It's been posted several times on the list by Dale Erwin and
others.  I'll post some pictures if I can find one.

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joseph Garrett
Sent: Tuesday, January 15, 2013 8:24 PM
To: pianotech
Subject: Re: [pianotech] measuring action ratios

David L said: 
"When analyzing actions I've used both the gauge for measuring key travel
versus hammer travel as well as the actual measuring and multiplying out the
three separate lever arms."

David,
What gauge are you referring to?
Joe 


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ratio device1.jpg
Type: image/jpeg
Size: 56249 bytes
Desc: not available
URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130115/f7ec8ba7/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ratio device2.jpg
Type: image/jpeg
Size: 40072 bytes
Desc: not available
URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130115/f7ec8ba7/attachment-0003.jpg>