Hi can someone please explain me the function is the dag blocks?
I would imagine that they also have a role in holding the action in place when the piano is being moved on its side, typically on a skid.
May we all please refer to them as dogs, not dags?
In most cases, dogs do not assist in bedding the back rail of the keyframe. They do, however, keep the rear of the keyframe from lifting when the piano is placed on its side for moving. They also, in some cases, act as a rearward stop for the keyframe, locating it fore/aft in the action cavity.
This is what grand piano keyframe/action cavity dogs do.
The majority of pianos would work (play) just fine with them removed, once all the factory bedding of the keyframe has been performed adequately. There are instances where dogs do in fact pinch the back rail down to the keybed, but these examples are few and far between.
"Dag" is perhaps the most conspicuous misnomer in our profession. They are dogs, as in pinch dogs on a workbench.
Kindly investigate the word "dag" in a dictionary. It is the fecal encrusted wool at the back end of a sheep.
In the 26+ years I have had the privilege of teaching at PTG regional and national conventions, I have presented both founded and unfounded terminology used in our industry regarding the nomenclature of piano parts and their functions, dag vs. dog being one of the many.
Come dinnertime at these events, I can overhear conversations of those who have attended my day's class reverting to the vernacular they have employed over their long and storied careers.
We can lead a horse to water, but...
Wim,In the 26+ years I have had the privilege of teaching at PTG regional and national conventions, I have presented both founded and unfounded terminology used in our industry regarding the nomenclature of piano parts and their functions, dag vs. dog being one of the many.Come dinnertime at these events, I can overhear conversations of those who have attended my day's class reverting to the vernacular they have employed over their long and storied careers.We can lead a horse to water, but...Sigh.Dave
You are likely correct as dogs are widely used in woodworking and I know of no other case where dag is used except in sheep husbandry. Interesting that dogs are common in a wood shop but are not mentioned specifically as such in the on-line dictionary I use, only that they are a machinists holding tool.
I hereby nominate you as the dog correction officer.
I think Capo D'astro is the biggest misnomer. I was taught it is supposed to be Capo Tasto. Tasto being a fret.
Re: your message #12 in this discussion of keybed dogs, we're getting off-topic, but d'astro = the stars, i.e. "overhead" or "from above". The capo d'astro bar is an overhead foundation for anchoring the speaking lengths in the melody range and high treble section of pianos.
David G. Hughes, RPT
David, the way it was explained to me was that the word "capo" (head) referred to the top of something and tasto makes it overhead fret. Which is certainly its function. Google translates capo d'astro as "star leader", maybe there's an Italian speaker that could expand on that for us.
I hadn't looked till today but there are plenty of references on a google search for capo tasto piano.
Maybe it's not a misnomer but just a different term.
Re: your message #11 in this discussion: I am honored. Thank you!
So it also seems to follow that "an old dog" can actually "learn a new trick"...yes?
Peter Grey Piano Doctor
No relation to this topic, but is there a technical term for when threads go on silly side tangents?