[pianotech] Touchweight: Re: half punching & figuring FW

[David Love]

Interesting isn't it, it's an "accelerated action" (or so it's stamped on
the action frame) without the bearings.  No I didn't remove them.  Key lead
positions are consistent with the accelerated actions.

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jerry Cohen
Sent: Monday, June 27, 2011 10:33 AM
To: pianotech at ptg.org; ptg_touchweightne at egroups.ptg.org
Subject: Re: [pianotech] Touchweight: Re: half punching & figuring FW

 

David,

I have 1 question. You mentioned this was a Teflon L from the 70's.

>From the pictures, I don't see the 1/2 round bearings under the keys. Did
you remove them?

If so, how do you compensate for the key height difference?

 

Thank you very much.

 

Jerry Cohen, RPT

NJ Chapter

 


  _____  


From: David Love <davidlovepianos at comcast.net>
To: pianotech at ptg.org; ptg_touchweightne at egroups.ptg.org
Sent: Sunday, June 26, 2011 10:43 PM
Subject: [pianotech] Touchweight: Re: half punching & figuring FW

Follow up for Barbara Richmond, somewhere near Peoria:

Tried uploading these to the new "higher logic" website but alas, no go
(still waiting for those Vulcan consultants to arrive apparently).  So I'm
posting it here on the old list where it's much simpler and works.
@&#*#$(&%*$()$.  I hope you see it here.  I've copied the new website even
though I have no idea how it will come through there.  

Anyway, this is a picture(s) of the veneer method of lowering the action
ratio without moving capstans.  It works very well and drops the ratio by
about .6.  I just did this on an 1970's Teflon Steinway L where I was
replacing the action.  Switched to 17 mm knuckles but still had a 6.0 ratio
(hammer displacement method).  Doing this dropped it nicely to about 5.4.
(6 mm dip moved the hammer 36 mm on the original (6.0) and 32.5 once the
veneer was in place (5.41).    

Thin veneer (it's probably .025" thick) is cut into strips about 1/8" wide
and glued in place behind (in this case since I'm lowering the ratio).  In
this case I replaced the punchings with thinner ones which I prefer and
might be required in some cases.  Much easier than moving the capstan and it
works quite well.  Can also be done in place of changing the shank or
knuckle where a lower of the ratio is needed but you're not changing parts
or only changing hammers and don't want to alter the hammer weight
necessarily.  Takes a few hours with all the regulation stuff.  Perhaps you
are already familiar with the method.  

David Love
www.davidlovepianos.com  



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