Checking

[William R. Monroe]

Quentin, Matthew,

I would add that where you place your knees under the key-frame changes the
checking, so be very attentive to how you place your knees under the action.
This is the way Yamaha taught us to set checking at the LRSchoolhouse, but
they were very quick to acknowledge the importance of supporting the
keyframe as consistently from one section to the next.

Best,
William R. Monroe



----- Original Message ----- 
From: "Quentin Codevelle" <quentin.codevelle at tiscali.fr>
To: "pianotech" <pianotech at ptg.org>
Sent: Thursday, March 23, 2006 10:04 AM
Subject: Checking


Hi Matthew,

As you say, checking height changes when varying the force of the pressure
on the keys.

That is why you have to be careful to put the same amount of force on each
key, and that is also important when regulating key dip, because if you do
not press all the keys the same way, you will not have an accurate
regulation, and key dip is very important for backcheck regulation.
You can help that with the installation of firmer front punchings, like the
Crescendo white punchings.

For me, the best way to regulate backchecks (on a grand), is to make a well
regulated sample in each section(15mm from the strings is the Yamaha
standard, for example), and then with the action on your knees, align the
adjacent hammers with that sample, and so on.
You have to bend the backcheck wire with your fingers a little bit, be
careful because sometime you don't have to move the wire too much to get a
big difference.

At the end, if your backcheck regulation is fine, you will have a straight
line with your hammers in checking position.

I hope this helps,

Quentin