REPETITION

[Jim Coleman, Sr.]

Hi Rogerio:

You didn't mention backchecking. If this is approximately 14 to 16 mm,
then I would think that the problem is in tightness of the flange pinning.
If you remove a hammer flange, the hammer and shank should swing about
6 or 7 half swings before coming to rest after being dropped from a 
horizontal orientation to the flange. If it is less, then probably some
repinning is in order. You can also check the wippen flange for tightness
by placing a penny (3 grams) weight near the end of the flange when the
removed wippen assembly is held up on end. If this requires more than
5 grams to move the flange, then again repinning or shrinking is in order.

You also did not mention the keybushings or the key balance bottom hole.
These can also be a source of resistance.

Jim Coleman, Sr.

On Tue, 1 Dec 1998, Rogerio Cunha wrote:

> I am with a great problem with a YAMAHA  grand model G2 and I need help.
> All the measures that I did on it I think that they are  very good : =
> hammer weight, letoff, drop off, the jacks are correctly under the =
> knuckles, key deep etc., etc. but the repetition is poor !
> The friction is very good ( I used powder micro Teflon).The repetition =
> springs are good.
> There are a problem : I haven't the Yamaha measurements and I used the =
> relation key deep-hammer travel 1:5.
> What can I do in order to increase the repetition that is poor.
> Rogerio Cunha - IC Member of the Guild.
> 
>