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About jack to knuckle alignment... #2946009 02/12/20 01:32 PM
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electone2007 Offline OP
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When I try to adjust the jack position using a slotted screw driver, the letoff dowels are in the way. The screwdriver shaft is too thick to fit in the narrow spaces between the letoff dowels. I can't gain access from the top of the dowels either. This is in a Yamaha G7.

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Re: About jack to knuckle alignment... [Re: electone2007] #2946048 02/12/20 02:53 PM
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BDB Offline
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I have run into that myself. Whoever thinks being a piano technician is easy is kidding him/herself.


Semipro Tech
Re: About jack to knuckle alignment... [Re: electone2007] #2946118 02/12/20 06:39 PM
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P W Grey Offline
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Some tools are thinner than others. You need a new tool.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
Re: About jack to knuckle alignment... [Re: electone2007] #2946213 02/13/20 02:21 AM
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Pianos & Pianos Mexico Offline
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Sometimes let-off dowels are attach to a rail screwed under the hammer rail, you can see small screws between hammer flanges or sometimes the hammer flanges had a notch for the screw, if removed you can take out a section of let off dowels, i suppose that you are doing jack alignment before let-off.


Sergio L. Ruiz Jones
Piano Tech
Pianos & Pianos
Piano tuning, service and restoration
Afinacion y Restauracion de pianos
www.pianosandpianos.com
Sergio.ruiz@pianosandpianos.com
Mazatlan, Mexico.
Re: About jack to knuckle alignment... [Re: electone2007] #2946294 02/13/20 08:47 AM
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CyberGene Offline
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This is funny smile I'm currently doing a DIY piano action regulation and stumbled upon the same problem two days ago and invented my own tool which I described in the digital piano forums, thinking that professional here have a special tool for that but it seems my solution might help.

So, basically I purchased a set of very thin and long screwdrivers that are made of an alloy that's not very hard and I could cut and file them. On the right is an unmodified screwdriver, in the middle is one that I cut through with a hacksaw and then extended each "horn" by inserting another screwdriver in the slot. (And on the left is a capstan and jack button tool that I made by sharpening another screwdriver and then twisting it)
[Linked Image]

[Linked Image]

So, with this tool and since it's a bit widened, it's possible to insert it between the jack buttons at an angle and still turn the screws. I basically aligned all the jacks under the knuckles and it was very helpful. Here's how it looks:
[Linked Image]

For whoever is interested, I also made my own key dip block from a white keytop and a woden block, as well as aftertouch gauge from a 1mm thick plastic:
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]


My YouTube, My Soundcloud
Currently: Yamaha N1X, DIY hybrid controller -> Garritan CFX
Previously: NU1X, ES7, MP6, CA63, RD-700SX, CDP-100, FP-5, P90, SP-200
Re: About jack to knuckle alignment... [Re: electone2007] #2949692 02/21/20 03:14 AM
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electone2007 Offline OP
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Thank you for all the responses here! Could anyone please point me to a link where I could purchase the tool? Maybe I could buy one before I try to make my own tool.

Re: About jack to knuckle alignment... [Re: electone2007] #2949721 02/21/20 05:47 AM
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Gregor Offline
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Originally Posted by electone2007
Thank you for all the responses here! Could anyone please point me to a link where I could purchase the tool? Maybe I could buy one before I try to make my own tool.


https://www.pianoteile.com/unsecure...&objid=A433300&page=2&red=pr


piano tech - tuner - dealer
Münster, Germany
www.weldert.de
Re: About jack to knuckle alignment... [Re: CyberGene] #2949722 02/21/20 05:49 AM
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Gregor Offline
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Originally Posted by CyberGene
Here's how it looks:


I clicked on that picture and then something ugly happened to my computer. A warning that my computer is blocked and I should call a phone number witihin 5 minutes. It pretended to come from windows support center. Be careful!


piano tech - tuner - dealer
Münster, Germany
www.weldert.de
Re: About jack to knuckle alignment... [Re: electone2007] #2949872 02/21/20 03:18 PM
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Chris Leslie Offline
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Sometimes you can manually lift the whippen to the point where the adjuster is accessible just above the dowels.
Other times, if you are doing many, you can remove the whole hammer rail with the hammers and dowels attached. All the adjusters are completely open then.


Chris Leslie
Piano technician
http://www.chrisleslie.com.au
Re: About jack to knuckle alignment... [Re: Chris Leslie] #2949885 02/21/20 03:54 PM
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BDB Offline
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Or the wippen rail. Either way, you may have to adjust the jacks at the end of each section by removing their wippens first.


Semipro Tech
Re: About jack to knuckle alignment... [Re: electone2007] #2949925 02/21/20 06:26 PM
Joined: Apr 2007
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rysowers Offline
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Posts: 3,240
Pianotek tool #JJS-1 is a good tool.
[Linked Image]
HOWEVER...
They also sell a tool for a combination handle: JCH-19 that is useless as a jack adjustment tool because the shaft is much too big. It turns out its perfect for spade type let-off screws that you find on some asian pianos. I believe that is what it is intended for, but is mislabeled in the catalog.[Linked Image]


Ryan Sowers,
Pianova Piano Service
Olympia, WA
www.pianova.net

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