METHOD

[Newton Hunt]

Hi Rogerio,

Assuming everything else has been done: level keys, space
hammers, travel hammers, jack position, repetition lever
height, etc., etc., then you can think about after touch.

After touch should be set only after the action has been
completely regulated first, this is just a refinement.

Key dip and hammer blow distance go hand in hand with each
other.  One effects the other.

Start by setting both to "standard specifications", 10mm for
dip and 48mm for blow distance.  Check the amount of after
touch which is defined as the amount of key movement after
the jack has lost contact with the knuckle.  1.2 to 1.7
millimeters.  Pick the best feel for that piano by lowering
or raising the hammer blow +2mm to -4mm then changing the
dip from -0.5mm to +1.0mm.

You want to vary each a bit at a time but if you have to use
the extremes to get what you want then there is something
wrong with the action or it's geometry.

Checking dip should be done with the punching under the key
felts because the felt feels different than the cardboard
when evaluating the amount of after touch.

As you change the dip or hammer blow you need to recheck
your drop which goes hand in hand with ddip/blow distances.

When you have the action perfectly regulated then you can
vary the dip plus or minus two of the thinnest papers you
have to account for differences in the action parts.  Don't
over do this.

		Newton