[CAUT] Bushing cloth thickness

[Jim Busby]

A big yes vote from me!

 

Jim Busby BYU

 

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From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
David Ilvedson
Sent: Wednesday, August 01, 2007 7:03 PM
To: caut at ptg.org
Subject: Re: [CAUT] Bushing cloth thickness

 

Everyone agrees that the addition of teflon powder with new bushings is
a good idea?

David Ilvedson, RPT
Pacifica, CA 94044

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Original message
From: "Fred Sturm" 
To: caut 
Received: 8/1/2007 5:02:32 PM
Subject: Re: [CAUT] Bushing cloth thickness

On 8/1/07 4:02 PM, "Mark Cramer" <Cramer at brandonu.ca> wrote:

	However, when the bushing rides the pin down, much like normal
playing conditions, even on a polished/Pro-lubed pin, there is a
definite sensation of the fuzzy un-finished felt, and I don't like it! 


I agree. This is more the reason for ironing than "sizing," which seems
pretty temporary beyond a small amount. You need quite a bit of
pressure, time, and heat to create a "permanent" dimension change. But
ironing, though it may not make the side play feel perceptibly different
at all, reduces the drag, probably mostly by tacking down the fuzz and
knitting it to the rest of the felt. 
    I notice it when trying the bushings by using a loose key pin (keys
still in the clamp): a very loose hold on the pin, "allowing" it to
move/float from front to back of each bushing mortise. Ironing makes a
very noticeable difference. Similarly, when testing keys on the keyframe
using a weight (I use half and full jiffy leads) to counterbalance the
lead in the keys. The difference between ironed and un-ironed is really
rather dramatic. 
    Okay, not that much time in the practice room would probably "iron"
the bushings through friction, at least in the middle of the keyboard,
for purposes of avoiding sticking keys, though it will be in the middle
of the bushings, meaning a cupped profile. But if I am wanting to do
anything with measuring touchweight, even just rapid diagnosis of extra
friction (upweight using 16 gm, then 20, then 24 on each key, just
chalking the ones that don't rise, that kind of thing), getting the keys
as near frictionless as possible beforehand makes life much easier. 75%
or more of the time I would find it was "the keybushings, stupid!"
before I started ironing as a standard procedure. And then it means
pulling the stack or using the offset bushing pliers, which I prefer to
avoid.
Regards,
Fred Sturm
University of New Mexico 

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