Wood Specie Insert for Capstan

[Greg Newell]

David,

The holes are predrilled but the capstan is pushed, not threaded, in.

 

Greg Newell

Greg's Piano Forté

www.gregspianoforte.com

216-226-3791 (office)

216-470-8634 (mobile)

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Nereson
Sent: Friday, February 29, 2008 1:50 AM
To: Pianotech List
Subject: Re: Wood Specie Insert for Capstan

 

    Sounds like something a factory would do.  And it explains why,
probably, I encountered a brand-new Boston studio where the lost motion
wouldn't stay put.  I regulated capstans, then proceeded to tune.  After
tuning, many notes again had way too much play.  Turns out, on a hard blow,
the capstans would just get pushed down into their holes.  The dealer
replaced the piano.

    But I can "see" a factory doing that, actually, to save time, if their
experience shows that the capstans stay tight in the wood.  

Driving very fine threads into hardwood is  similar to driving tuning pins
into the pinblock.  And most capstan screws do have fairly fine machine
threads, not wood screw threads.  But if I were replacing capstans, or
moving the capstan line, or installing wood inserts, I would drill the
holes.

    --David Nereson, RPT

----- Original Message ----- 

From: Greg Newell <mailto:gnewell at ameritech.net>  

To: 'David Nereson' <mailto:dnereson at 4dv.net>  ; 'Pianotech List'
<mailto:pianotech at ptg.org>  

Sent: Thursday, February 28, 2008 6:18 AM

Subject: RE: Wood Specie Insert for Capstan

 

David,

                Del once told me that is exactly what is done. I still
haven’t tried it but I guess it works. I saw it once at a factory and
couldn’t believe what I was seeing at the time. I think my mind just assumed
that the bit contacting the capstan top was spinning and the friction
between them caused the capstan to spin also, but not so. They were being
pushed in. 

 

Greg Newell

 

 

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