no rep on upright

[tom]

Subject: no rep on upright

 

I installed a set of new hammer return springs on a Steinway console several
weeks ago. The touch is on the heavy side, but not unplayable. Even though
everything works "right", on soft blows, the jack isn't going back under.
The keys are eased, the wippens and not sluggish, the hammer flanges are not
tight, and the jacks return when the keys comes up all the way, and  But on
a medium fast repetition, the jack doesn't come back under, and the hammer
butt gets caught on the back check.  Would weakening the return springs help
this? Or is there something else I should be looking for. 

Willem (Wim) Blees, RPT

            

Wim,

 The late great Steve Jellen addressed this in class. A too strong hammer
return spring can overpower the returning jack. I would first check the jack
pining, jack springs and condition of the butt leather and smoothness of
jack tops. Also having the hammers check closer to the strings can give the
jack more room to return. Capstan-whippen cushion friction and maybe even
spoons digging into the damper levers could be worth a look. 

A thousand years ago I was stocking up on all sorts of supplies and
theorized that “heavy duty” and “heaviest -strongest “   had to be the best
choice for everything.

I think some of those springs are still kicking around the shop.

Best,

Tom D.






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