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

[Joe Goss]

Very interesting
Joe Goss BSMusEd MMusEd RPT
imatunr at srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "David Love" <davidlovepianos at comcast.net>
To: <pianotech at ptg.org>; <ptg_touchweightne at egroups.ptg.org>
Sent: Sunday, June 26, 2011 8:43 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
>