Keep on filing...(picture attached)

[Porritt, David]

I've always tried for 1-gram at the jack, 3 or 4 at the wippen and 8 at
the repetition lever.

 

dp

 

David M. Porritt

dporritt at smu.edu

________________________________

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On
Behalf Of Joe And Penny Goss
Sent: Friday, June 22, 2007 10:50 AM
To: Pianotech List
Subject: Re: Keep on filing...(picture attached)

 

Just a thought,

Should the pinning of the jack be looser than that of the wippen so that
jack's needs are taken care first?

When Jack is happy!

Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com

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

	From: Porritt, David <mailto:dporritt at mail.smu.edu>  

	To: Pianotech List <mailto:pianotech at ptg.org>  

	Sent: Friday, June 22, 2007 9:06 AM

	Subject: RE: Keep on filing...(picture attached)

	 

	Ric:

	 

	You need to read more carefully.  Dean said " If you increase
the resistance of the pinning, you must also increase the spring tension
to overcome this resistance for a given hammer lift."  Of course the
spring tension doesn't get increased until you increase it.  The point
is you can increase the tension helping to return the key and hammer
without making a jumpy hammer.

	 

	dp

	 

	David M. Porritt

	dporritt at smu.edu

	-----Original Message-----
	From: pianotech-bounces at ptg.org
[mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Brekne
	Sent: Friday, June 22, 2007 10:29 AM
	To: pianotech at ptg.org
	Subject: Keep on filing...(picture attached)

	 

	Oh come on Dean... for criminees sakes... spring tension isnt
increased 

	until you actually increase it. Nobody said anything in previous
posts 

	about maintaining <<a given hammer lift>>.  But since you first
mention 

	it... have you ever actually tried seeing what happens to hammer
lift 

	for a say.... 5 gram change in rep pinning resistance ?  I
havent.. and 

	cant really say I know what the result would be.  But I would
imagine 

	(as in guess at) that you probably would not see all that much a
change. 

	Another little tidbit to check out tho... good fun.

	 

	Cheers

	RicB

	 

	 

	    Ric wrote: After all.. the spring tension is not actually
increased.  

	 

	    Seems to me it is. If you increase the resistance of the
pinning,

	    you must

	    also increase the spring tension to overcome this resistance
for a given

	    hammer lift.

	 

	    Dean

	 

	    Dean May             cell 812.239.3359

	 

	    PianoRebuilders.com   812.235.5272

	 

	    Terre Haute IN  47802

	 

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