Tuning pin angle(s)

[Delwin D Fandrich]

Attached is a photo showing one of them. A maple strip is fitted under the felt
which raises the string to an appropriate level relative to the string coming
off of the pin.  

Another option -- and this is what I most commonly do these days -- is to use a
brass half-round or half-oval along the top of the ski slope. Again, this is to
bring the string up to an appropriate level relative to the tuning pin.

Del

| -----Original Message-----
| From: pianotech-bounces at ptg.org 
| [mailto:pianotech-bounces at ptg.org] On Behalf Of 
| jimialeggio5 at comcast.net
| Sent: June 26, 2007 4:33 AM
| To: pianotech at ptg.org
| Subject: Tuning pin angle(s)
| 
| List,
| 
| In searching the archives and reading whatever info is 
| available in past journals etc,  reasonable consensus is that 
| the string takeoff angle from the pin centerline to the 
| counterbearing bar should be around 90 deg.
| 
| A couple of questions regarding this:
| 
| 1-in looking at a number of plates, particularly ones with 
| the "ski slope/very minor counterbearing bar/lots of felt 
| contact ", the pin angle in relation to the webbing would 
| have to be a negative angle to achieve 90 deg string takeoff 
| angle from the pin. That is negative, ie  actually angled 
| towards the belly, often by 4-5 deg, assuming coil height at 
| 1/8 " from plate.
| 
| Is 90degrees takeoff ,90 degrees, irrespective of the 
| orientation to the webbing (or actually the rim top which 
| indexes many rebuilders drilling jig)?
| 
| 2-the difference in takeoff angle between the front pin of a 
| unison and the back pin of the same unison results in a very 
| different takeoff angle, maybe 2-4 degrees.
| 
| 90 degrees can't actually be 90 degrees throughout, unless 
| you're nuts.
| 
| 3-the 90 degrees (or so) is not in relation to the stretcher, 
| but in relation to location of the agraffe, which again 
| changes from note to note. Does anybody actually customize 
| the direction of the angle from note to note?
| 
| 4-Regarding the "ski slope/very minor counterbearing bar/lots 
| of felt condition"...rendering the string over all this felt 
| creates problems because of the tendency of the wool to hold 
| moisture, and rust the string/felt contact. 
| 
| ??Why is wool felt exclusively used in this place?  Besides 
| the obvious reason which is "because that's the way its 
| always been done".  Some rebuilders do in fact use acrylic 
| felt here, but keep it quiet in the fear that they might be 
| struck by lightening if anybody knew their dirty secret.  Any 
| thoughts?
| 
| Jim I   
| 
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