aftertouch vs jack escapement

[ed miller]

I'm regulating a Knabe upright. I’m having a problem juggling acceptable 
aftertouch vs. an acceptable amount of jack escapement out from under the 
hammer butt.

With blow distance set at 1.75", let-off at 1/8", key dip at 3/8" and 
checking at 5/8".... aftertouch is about .040". With the dimensions as such 
the key feels like it plays well. In previous regulations I would have been 
very happy with this.

However, this time I'm regulating according to Bill Spurlock's Vertical 
regulation pamphlet. In it he talks about aiming to have jack escapement be 
1/16-1/8" out from under the hammer butt when the key is fully depressed. 
With all of the above dimensions in this Knabe upright the jack doesn't 
rotate completely out from under the hammer butt.

Spurlock suggests decreasing the hammer blow distance to allow the jack to 
escape further. When I do this my aftertouch becomes too great. If rather, I 
increase the key dip to allow for more jack escapement aftertouch becomes 
too great again.

In order to have the jack escape properly I would have to decrease the 
hammer blow distance to under 1.5” (I know because I tried it). As I 
suspected my aftertouch shot up, it was then .100”. If I then decrease key 
dip, the jack doesn’t rotate far enough.

Then I tried to make my checking earlier. Even at less then .5” checking the 
jack doesn’t completely get out of the hammer butts way before it is caught.

What do I do????

Thanks, Ed

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