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

[Barbara Richmond]

Thanks, David. 

So, what I've wondered is, how you calculate the FWs when using the veneer strip. Do you make all your changes to the action--including the veneer strip--regulate and then take the final down and up weights, enter them into the spreadsheet and then do the calculation? Or something else? 

Thanks, again. 

Barbara Richmond, RPT 
near Peoria, IL where a big thunderstorm is on the way and I'll have to unplug the computer soon...... 

----- Original Message -----
From: "David Love" <davidlovepianos at comcast.net> 
To: pianotech at ptg.org, "ptg touchweightne" <ptg_touchweightne at egroups.ptg.org> 
Sent: Sunday, June 26, 2011 9:43:06 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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