capstan spacing

[Allen Wright]

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Isaac,

But how about the keys that have bends by design (bass and treble)?=20
They certainly don't line up.

Allen

Allen
On Thursday, August 5, 2004, at 03:41  AM, Isaac OLEG wrote:

> Ask some design oriented guys more experienced than me, but seem to me=20=

> that the goal in placing capstan and pins is to align them on a=20
> straight line (front pin, balance pin / capstan) while this ideal=20
> situation is not always possible indeed.
> =A0=A0
> Isaac OLEG
> =A0
> =A0
> -----Message d'origine-----
> De=A0: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de=20=

> Allen Wright
> Envoy=E9=A0: jeudi 5 ao=FBt 2004 03:28
> =C0=A0: College and University Technicians
> Objet=A0: Re: capstan spacing
>
> Wim and Vince,
>
> My question would be, what happens to the spacing of the rep to the=20
> hammer shank/knuckle after these acrobatics you mention?
>
> I certainly shim the whip flange in order to space the lever to the=20
> hammer flange, but I prefer to keep the top of the rep lever as=20
> horizontal as much as possible, and not tilt the lever off of 90=20
> degrees if I can help it.
>
> But what I'm really getting at is this: I notice quite a few of the=20
> capstans I've removed were slightly off center of the keys anyway, and=20=

> not always in the right direction (making the capstan spacing=20
> noticeably off). It just seems to make sense to me to take advantage=20=

> of the opportunity (while drilling new capstan holes) to see where the=20=

> whip heels are when all the action parts are properly spaced to the=20
> strings (particularly in the bass and tenor, where the strings can't=20=

> be moved) and drill capstans off center purposely in the right=20
> direction.
>
> Probably even just some form of eyeballing the relationship of the=20
> whip heels to the keys could be used to mark where to drill the=20
> capstan holes. I wondered though if anyone has thought about this and=20=

> perhaps come up with a real accurate way to do it.
>
> I also wonder if there is any reason why slightly off-center capstans=20=

> could be a bad idea, in terms of geometry or wear. Perhaps more wear=20=

> on one side of the keybushings? I imagine that would be subtle if=20
> noticeable at all.
>
> Any comments will be appreciated.
>
> Cheers,
>
> Allen Wright
> Northern Kentucky University
> On Wednesday, August 4, 2004, at 03:28 PM, Wimblees@aol.com wrote:
>
> In a message dated 8/4/04 11:15:10 AM Central Daylight Time,=20
> awright440@cinci.rr.com writes:
>
> I
> noticed before removing the capstans that quite a few of them aren't
> centered perfectly to the whip heels, some being quite noticeably off
> to one side or the other. The rep levers are spaced to the hammer
> shanks accurately (with the hammers spaced to the strings).
>
>
> Alan
> =A0
> You can try to center the cushions=A0over the capstans by tilting the=20=

> wips.=A0You might need to paper the flange to do that, just like you=20=

> paper one corner of a hammer flange to move the hammer to the right or=20=

> lift. (not the same as traveling).
> =A0
> The other way to center the capstan under the wippen is to move the=20
> front of the key. I just did this on an older D. There=A0were quite a=20=

> few=A0capstans that were not=A0center under the wippen cushions. So =
after=20
> I tilted the wips as much as I could, I moved the front of the key=20
> slightly, and moving some of the keys around them to make sure=20
> the=A0keys were still evenly spaced. Also, make sure the keys are =
level.=20
> That can also effect the centering of the capstan.
> =A0
> Wim
> Willem Blees, RPT
> Piano tuner/technician
> School of Music
> University of Alabama
>

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