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

[Jerry Cohen]

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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