Double Striking Hammers

[Roger Jolly]

Hi Avery,
         Generally a combination of poor tail geometry, back check rake
angle, rep spring too stiff,and too little after touch. If the piano is
well used check to see if the tails are starting to get polished, if so
skuff them and use a brass suede brush to raise the nap on the checks. I
learned a little trick from John Hartman, make a 1 gram weight that will
clip on to the top of the hammer. set the springs to just lift the spring
very smoothly, the consistency that this method gives is unbelievable.
Regards Roger



At 12:09 PM 18/09/98 -0500, you wrote:
>List,
>
>   I'm having a minor problem on one of our 'D's with hammers that sometime
>double strike a little on very soft blows. The key(s) are being played all
>the way down but the hammers don't go into check on that soft a blow. So
>some bounce back up enough to sometimes "bubble" very softly.
>   It's happened before on another piano but I've always been able to change
>a little here, a little there, and manage to stop it. However, I've never
>really understood why it happens or what regulation adjustment would be
>*most* likely to stop it. Or is it a combination of things: like rep spring
>too strong, drop too little or too much? Dip? Something else? Comments?
>   Thanks.
>
>Avery
>
>
>
Roger Jolly
Baldwin Yamaha Piano Centre
Saskatoon and Regina
Saskatchewan, Canada.
306-665-0213
Fax 652-0505