[pianotech] Best way to change touch on Yamaha Grand

[Mike Spalding]

Barb,

I've never tried this little trick, but reading your explanation got me 
thinking...  What you're actually doing is changing the action ratio by 
moving the fulcrum.  So doesn't that reduce the aftertouch, possibly to 
the extent that you have to either add dip or reduce blow to get letoff?

Barbara Richmond wrote:
> Hi Denise,
>
> To demonstrate the punching trick, measure the up and down weights on 
> the key.  Then take a half-punching, glue it on a paper 
> punching--matching the thickness of the original punching as much as 
> possible.  Remove the original punching and place the half-punching 
> combo on the balance rail (making sure the felt is to the rear of the 
> balance hole).  Measure  the up and down weights again after you 
> insert the half punching combo.  You will see/feel the difference.
>
> Also you could turn the punching combo so the half punching is in the 
> front, that will make the down weight go up.
>
> Yes, it's possible to glue in thin strips of veneer, etc. along the 
> balance rail, but then you would need to make changes in punchings to 
> adjust the key height.  Using the original punchings as half-punchings 
> is the quick and dirty way of accomplishing the task. 
>
> Think teeter-totter--adjusting the fulcrum so kids/people of unequal 
> weight can ride on it at the same time and still have fun.  :-)
>
> Barbara Richmond, RPT
> snowed-in near Peoria, Illinois
>
> ----- Original Message -----
> From: "Denise Rachel" <pp-ff at verizon.net>
> To: pianotech at ptg.org
> Sent: Thursday, January 7, 2010 11:28:27 AM GMT -06:00 US/Canada Central
> Subject: Re: [pianotech] Best way to change touch on Yamaha Grand
>
>
> BTW, I didn't really understand the process of changing the key 
> weights by trimming glued on balance rail felts.  One of the very last 
> posts of that thread seemed to contradict the others, and nobody 
> picked up on it.  Maybe I should just disregard that issue, which is 
> causing me the concern now.
>
>
> Denise
>
>
>
>