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laser on a pin

  • 1.  laser on a pin

    Registered Piano Technician
    Posted 10-16-2023 18:20

    Hello all,

    I searched in the Journal index as well as on Internet, could not find, so I am asking the community about an article where they put a laser on a tuning pin to measure its "bend".

    It might have been subject of a class in Saint-Louis in Saint-Louis

    Anybody can help us locate this ?

    Bests,



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    Allan Sutton, m.mus. RPT
    Saint-Laurent QC
    (514) 344-8008
    www.pianotechniquemontreal.com
    www.facebook.com/pianotechniquemontreal
    twitter: @allansutton
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  • 2.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-16-2023 18:31

    Allan,

    I don't know about a Journal article involving a laser and bending of tuning pins, but I once attended a class by Dan Levitan in which he mounted a mirror on one tuning pin, pointed a laser at it (the mirror reflected the laser off a wall, exaggerating pin movement) and turned the tuning pin that shared the same piece of wire. It did indeed appear that the tuning pin with the mirror on it was actually turning a bit in the process!

    Could this have been what you were referring to, or is this anecdote related to your question soley because it involved a laser and a tuning pin?

    Alan



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    Alan Eder, RPT
    Herb Alpert School of Music
    California Institute of the Arts
    Valencia, CA
    661.904.6483
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  • 3.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-16-2023 19:15
    Very interesting ! Anyway the mirror is a great idea if we wanted to conduct our own experiments...

    Allan Sutton, m.mus. RPT, TEC
    www.pianotechniquemontreal.com





  • 4.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 07:16
    Got it ! Thank you 

    Nov 2015:

    The Lab Report...Measuring Tuning Pin Tilt and Twist 

    By the Appleton WI Chapter

    Allan Sutton, m.mus. RPT, TEC
    www.pianotechniquemontreal.com





  • 5.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 08:04

    Yay! I wanted this as well. Thanks for digging! 

    I was able to see this in person at the convention Pat mentioned. It was brilliant!



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    Maggie Jusiel, RPT
    Athens, WV
    (304)952-8615
    mags@timandmaggie.net
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  • 6.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-16-2023 20:03

    Aside from Dan Levitan's demonstration, I believe Keith Akin, and members of the Madison Wisconsin chapter (Baoli Liu, among others), and others did similar experiments/demonstrations that were written up on the Journal and presented in classes at our summer convention a few years ago.



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    Patrick Draine RPT
    Billerica MA
    (978) 663-9690
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  • 7.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 11:20

    Hi, Allan,

    In one of the Dan Levitan class that I attended, he used a laser to demonstrate how a conventional tuning lever bends (or, if you prefer, "flexes") the tuning pin. He showed how it was possible to turn the tuning pin with his "C" lever WITHOUT flexing it. I've seen some fine tuners who haven't grasped that idea. 

    Bob Anderson, RPT

    Tucson, AZ



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    Robert Anderson RPT
    Tucson AZ
    (520) 326-4048
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  • 8.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 11:32

    No matter what kind of lever you use, you're going to bend (flex)  the pin unless the lever is manipulated equally from both sides, like a T handle rotated around the pin.  Or an impact-type of hammer.  The C hammer is not immune from flexing the pin, but as the handle is generally in line with the string, the bending is side to side rather than fore-aft.  Thus it doesn't affect the pitch much as you turn the pin.  I used the C lever, but sold it to someone, so I have experience with it.  It did work well. 



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    Paul McCloud, RPT
    Accutone Piano Service
    www.AccutonePianoService.com
    pavadasa@gmail.com
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  • 9.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 14:24
    Paul, I understand the physics of this c-lever not flexing the pin, notwhistanding the fact that it is positioned parallel to the string.


    Allan Sutton




  • 10.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 18:10
    Well, I have to disagree, Paul. It’s certainly possible to bend the tuning pin side to side if you grasp the handle above the string plane but you don’t have to do that and that is not where it is suggested that you grasp it. With a conventional lever, the pin can be bent in any direction (limited by proximity to the rim), depending on how you place it on the pin. The pin must bend when the handle is above the string plane and the laser experiment confirms that. The Levitan C lever can bend the pin away from or toward the string and also at angles, limited by the stretcher, but not by just turning it. I have been using the Levitan lever for 10 years now and I would never get rid of it.

    Bob Anderson, RPT
    Tucson, AZ




  • 11.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 21:56

    I can see your point.  It can flex the pin, but not if you hold the lever in a neutral position.  I used to use a little bit of "English" to set the pin by lifting the lever to flex the pin forward and lock the pitch. I understand the theory of using handle of the lever below the plane of the string.  The ideal would be if the tuning tip would only touch the pin at the bottom against the plate (like a spanner or box wrench).  Then it could not flagpole the pin.  Like I said, it did work well, but it was hard to carry in my tuning kit, and it ended up staying in the trunk.  I sold it to someone with a shoulder problem, which was the reason I bought it in the first place.



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    Paul McCloud, RPT
    Accutone Piano Service
    www.AccutonePianoService.com
    pavadasa@gmail.com
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  • 12.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-17-2023 22:08

    The article mentions videos. Are there any?



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    Steven Rosenthal RPT
    Honolulu HI
    (808) 521-7129
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  • 13.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-18-2023 07:21
    The link and QR code to " Video and additional photos" return a "not found" error 404

    Maybe someone in that chapter could locate the video ?

    Allan Sutton, m.mus. RPT, TEC
    www.pianotechniquemontreal.com





  • 14.  RE: laser on a pin

    Registered Piano Technician
    Posted 10-19-2023 12:01

    When all is said and done, by the time you remove your hammer (lever...whatever) from the tuning pin, the pin is "bent" like it or not. If it's not bent you do not have a stable situation. 150-230 lbs of tension produces a slight bend in the pin...period. the amount of bend depends on the diameter, coil height, and other characteristics, but a bend is a bend. The totality of forces involved is what must be left in a reasonably balanced condition (which clearly includes the forced "bend" in the tuning pin). 

    As we all know, this is the "trick"...balancing all these forces for stability. I don't care whether I bend (flex) the pin or not (in fact I always do). What I care about is settling everything into a situation that is stable afterward. The bend is my friend, and if I treat it right it remains my friend. 

    Peter Grey Piano Doctor 



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    Peter Grey
    Stratham NH
    (603) 686-2395
    pianodoctor57@gmail.com
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