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#2159057 - 09/28/13 12:32 PM Tuning pin replacement size for loose tuning pins?  
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I have a client with a nice German Schilling Upright. The condition of the piano is overall quite well. The steel strings look clean and not corroded, the bass strings look and sound good. Keyboard, action, hammers... all are rarely used.

The only one but severe problem are loose tuning pins. The current tuning pins are 60 mm x 7.0 mm. Some are just a bit on the loose side but still tuneable, other are extremely loose, so that they don't hold a tuning at all.

What size would be adequate for replacement tuning pins?


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#2159064 - 09/28/13 12:40 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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An application of low viscosity CA glue will probably be sufficient.

#2159084 - 09/28/13 01:41 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I am with beethoven on the thin CA glue as the first try repair. Lay the piano on its back. Use an extender tube on the bottle.

If after letting all the glue set up for a day, the pins still won't hold, go up by two diameter increments from the present pins. Except for the top octave or so where maybe one size increase would be better because really tight treble pins make tuning slow.


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#2160625 - 10/01/13 10:16 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I agree with Ed completely!


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#2160646 - 10/01/13 11:04 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Ed McMorrow, RPT]  
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Originally Posted by Ed McMorrow, RPT
I am with beethoven on the thin CA glue as the first try repair. Lay the piano on its back. Use an extender tube on the bottle.

If after letting all the glue set up for a day, the pins still won't hold, go up by two diameter increments from the present pins. Except for the top octave or so where maybe one size increase would be better because really tight treble pins make tuning slow.


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#2160710 - 10/02/13 02:08 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I know techs that change the tuning pins on site without putting the piano on its back. 1 size is enough usually 2 sizes you need to ream

if the bad pins are on lines the pinblock is in cause

piano at pitch and good pin setting allow most pianos to be tuned, unless the pinblock is at fault or the holes ovalized by time or brutal tuners (benders)

I consider that if the hammer does not come back, I can set the pin and string with enough stability.

Tapping 1-2 mm can buy about 10 years on a good quality block.

I would not take the risk of compromizing the wood (gluing the fiber that usually serve to lock the pins)

It may be possible that the thread on the pins have wear but the block is good.

Last edited by Olek; 10/02/13 02:13 AM.

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#2160986 - 10/02/13 10:02 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Dear Upright - Just curious if this is your first time repinning a piano?

I concur with the others who encourage you to try CA glue first. Just make sure you purchase a thin mixture - I use the product that Schaff Piano Supply sells, and it works well.

If that doesn't do the trick, repinning may be in order. If you haven't done a repinning job, I'm sure those who have would be glad to give you some tips to help you attain satisfactory results. Chuck Behm


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#2161040 - 10/03/13 02:29 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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To my knowledge, notwithstanding their technical merits, pinblock treatments, especially CA glue, are much more frowned upon in Germany than in America.


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#2161089 - 10/03/13 07:26 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Mark R.]  
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Quote
"To my knowledge, notwithstanding their technical merits, pinblock treatments, especially CA glue, are much more frowned upon in Germany than in America." - Mark R.


Hi Mark - That's interesting to know - I wasn't aware of that, but I'm not surprised at all.

I first heard about using CA at a lunch break during a technician's meeting and I remember thinking (and commenting on) how dumb I thought the idea was. Supergluing a pinblock! I seemed ridiculous to me.

Then, a few months later, I had occasion to try it. I had a little old lady customer with a little spinet that she loved with pins so loose some of them would turn counterclockwise by themselves when you let go of the hammer. She was on a fixed income, so repinning was out, and the pins had already been tapped in. Using Lundford's pinblock restorer was out, in that she lived in a tiny apartment where leaving the piano on its back for an extended time was out.

Long story short, I tried the CA treatment, only charging her for the cost of the glue. I told her it was an experimental procedure for me, and therefore I was willing to do it for no labor charge.

It worked very, very well, and the piano has been stable ever since, with pins which hold well.

Faced with a piano with loose pins, I ordinarily offer options, from CA treatment all the way to a new pinblock, pins and strings, with a huge difference in price range. I tell my customers that I've observed that CA treatment typically will give 75% of the benefit (in terms of torque) of repinning at a fraction of the cost.

Anyway, I can well understand if there's regional skepticism. I wouldn't particularly want to be the one technician using a procedure that everyone else in my area frowned upon. For example, here in the U.S. (and elsewhere I would imagine) use of the metal tuning pin sleeves intended for shimming loose pins are pretty much universally frowned upon. Using them would pretty much be the kiss of death for your reputation - at least among other technicians.

Thanks again for the heads-up. A good bit of information to keep in mind in the future. Chuck


Last edited by Chuck Behm; 10/03/13 07:28 AM.

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#2161103 - 10/03/13 08:22 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Chuck Behm, CPT-E]  
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Originally Posted by Chuck Behm
Quote
"To my knowledge, notwithstanding their technical merits, pinblock treatments, especially CA glue, are much more frowned upon in Germany than in America." - Mark R.


Hi Mark - That's interesting to know - I wasn't aware of that, but I'm not surprised at all.

I first heard about using CA at a lunch break during a technician's meeting and I remember thinking (and commenting on) how dumb I thought the idea was. Supergluing a pinblock! I seemed ridiculous to me.
I would imagine) use of the metal tuning pin sleeves intended for shimming loose pins are pretty much universally frowned upon. Using them would pretty much be the kiss of death for your reputation - at least among other technicians.




It is also considered BS here, in fact I never seen one installed in a piano.

The idea is not to "glue" the pin, but probably to gain some resiliency in a wood that is mushy.

The reports I had confirmed the absence of the usual feedback from the pin. Now if it allow cheap grade pianos to be made more or less tuneable it may be a good sercice to the owner...

DUe to the way I see the tuning lever manipulations, I believe that part of the pinblock wear is due to tuners.

only very low quality pinblock under hard moisture conditions should fail, with good tuning methods.



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#2161121 - 10/03/13 10:02 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Quote
"only very low quality pinblock under hard moisture conditions should fail, with good tuning methods" - Isaac Olek

Isaac - Here in the midwest with frigid winters and humid summers, the effects of dry, heated air one season and dripping humidity the next can really affect pinblocks, no matter how good the piano. Granted, cheaply made pianos are bound to fail first, but I've seen very good pianos with pins that won't hold, due to a pinblock that has severely dried out.

Your comment about the absence of usual feedback from the pin (I think you're talking about CA) is correct. Pins treated with CA have a different feel from repinned pianos, which in turn feel differently than pianos which have an all-new pinblock and size 2 pins. I prefer the feel I get with a new pinblock, but I also charge 30 times as much for going that far than I do for an application of CA. In the end, for the customer the CA treatment can be very satisfactory, in that his piano will be much more stable than before the application. Chuck



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#2161128 - 10/03/13 10:23 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
It may be possible that the thread on the pins have wear but the block is good.

A hole (bush) is oval. Because a string have a pressure towards a floor (piano).
You can fill in a hole the CA or increase the size of a pin.
sometimes corrugated cardboard shim will a aid

#2161162 - 10/03/13 11:36 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I work on plenty of old pianos that have not visible oval holes.

Out of quality, and caution when tuning, it may be climate related, certainly.

Under normal conditions, the hole can oval a little, but not deeply, the force is reflected farther +- on the opposite side by the pin, so the bottom of the hole does not take stress as much, and of the pin can grip a little there, even with a slightly oval entry the pin can be set.

Moving back and forth or pushing strong on the hole will wear it at its deepest, and sand the bed of the key, the portion where it lay.

That is why a perfect knowledge of the rotation plane is prerequisite to tuning. So to apply force where it is not harmful, I. e, on the pin itself or the portion of hole that is not used for setting the pin.


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#2161488 - 10/04/13 12:09 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
Under normal conditions, the hole can oval a little, but not deeply, the force is reflected farther +- on the opposite side by the pin, so the bottom of the hole does not take stress as much, and of the pin can grip a little there, even with a slightly oval entry the pin can be set.

No need to distort the essence of physical phenomena fixing of a pin.
I think unimportant to consider: "Where a delete wood more in a bush or the upper part of the hole pinblock?".
Corrugated cardboard shim provides increased friction between a pin and wood hole

#2161585 - 10/04/13 05:50 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I agree, but what happens too is the wear of the thread on the tuning pin.

We do experience a cool climate so my experience in shot pinblocks is limited.

Now of course wood resiliency migrates farther from the pin with age. Only friction allows to tune then, but strangely even on very old pianos with original pins (Viennese forte for isntane) I could obtain a very firm pin setting (after numerous lowering/loading of the pin stress.

It is a "knot" with a balance of stresses, and the pin is an active part of the whole.

It is harder to learn to "tune the pin" than to tune the string only, and one need to base the setting on the amount of resistance coming from the upper wire segment.

Once that resistance is balanced by the pin's and pinblock resiliency you are directly impacting the sounding length, so the impression in the lever is that the tuning pin and upper segment are "transparent".

I have find no other mean to fine work the string.

Retuning often mean restitution of the balance of forces, and if not enough the whole thing can be put back under the correct tension/pitch without modifying the original balance.







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#2161689 - 10/04/13 10:43 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
I agree, but what happens too is the wear of the thread on the tuning pin.

We do experience a cool climate so my experience in shot pinblocks is limited.

Now of course wood resiliency migrates farther from the pin with age. Only friction allows to tune then, but strangely even on very old pianos with original pins (Viennese forte for isntane) I could obtain a very firm pin setting (after numerous lowering/loading of the pin stress.

Thanks,Isaac
I would want see this original pins (Viennese forte for isntane). If are you have foto or a link
Regards,Max

#2161840 - 10/04/13 05:46 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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I am not sure I have a picture.

They are made with wrought iron, so they cannot be tense much they may break if too much stressed.

very little length goes in the pinblock.

Despite that they can be set "strong" as piano tuning pins.

P.S) while it is not absolutely recommended to install very firm pin setting as iron strings may need to be tuned more often (?) they also are used by Baroco ensembles and different temperament may be asked.

A colleague who specialized in tuning historical instruments told me that we "cheat" when tuning them, the idea is to give "an impression of justness" it is really up to the tuner to accept or not some intervals, and play with the unisons.

Last edited by Olek; 10/05/13 05:54 AM.

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#2161923 - 10/04/13 10:44 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
very little length goes in the pinblock.

Is it less 30 mm in a pinblock?

#2162001 - 10/05/13 05:54 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Probably less , yes


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#2162011 - 10/05/13 06:47 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Dear Chuck,

thank you for your comment. This is not my first time of repining. I did complete restringing as well as partial pin replacements. I also used CA in a few cases. But I wanted to know others opinions on the topic.

I know the rule of thumb to go up two sizes from Reblitz. But as the pins can be bought here in Germany in size steps of 0,05 mm, I wanted to know others rules of thumb and what they use, in different cases.

And I am glad, this developed into an interesting discussion.


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#2162026 - 10/05/13 07:45 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Originally Posted by Upright
Dear Chuck,


I know the rule of thumb to go up two sizes from Reblitz. But as the pins can be bought here in Germany in size steps of 0,05 mm,


What brand ? never seen that ? Noticed the "low torque" tuning pins with a thinner top section diameter, from Klinke. Good idea.

I only used Biene or Klinke and dimensions are the same standardized diameters.



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#2162061 - 10/05/13 10:02 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
Probably less , yes

Isaac, I have one question: Is thread notching Vienna's pin usual? Or it's has the big hight thread?

#2162062 - 10/05/13 10:06 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
A colleague who specialized in tuning historical instruments told me that we "cheat" when tuning them, the idea is to give "an impression of justness" it is really up to the tuner to accept or not some intervals, and play with the unisons.

Thank,Isaac.I understood about "an impression of justness"

#2162146 - 10/05/13 01:47 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Olek]  
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Originally Posted by Olek
Originally Posted by Upright
Dear Chuck,


I know the rule of thumb to go up two sizes from Reblitz. But as the pins can be bought here in Germany in size steps of 0,05 mm,


What brand ? never seen that ? Noticed the "low torque" tuning pins with a thinner top section diameter, from Klinke. Good idea.

I only used Biene or Klinke and dimensions are the same standardized diameters.


I can order Biene/Klinke in sizes of 6.6 / 6.75 / 6.9 / 7.0 / 7.10 / 7.15 / 7.20 / 7.25 / 7.30 / 7.35 / 7.5 / 7.65 / 7.75

Especially, when I have the old tuning pin with size 6.9 or 7.0 what would be the right upsize of the new tuning pins?


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#2162183 - 10/05/13 03:48 PM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Quote
"I can order Biene/Klinke in sizes of 6.6 / 6.75 / 6.9 / 7.0 / 7.10 / 7.15 / 7.20 / 7.25 / 7.30 / 7.35 / 7.5 / 7.65 / 7.75" - Upright


Dear Upright - 13 thickness sizes! Does each thickness come in 3 sizes of length, as they do here, and also in choice of blued or nickle plated? If they do, holy cow! I'd be in trouble! Chuck


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#2162395 - 10/06/13 04:26 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Correct, these sizes, blued or nickel plated, 5 sizes of length (52 / 55 / 57 / 60 / 64 mm)


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#2162396 - 10/06/13 04:35 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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so from 7.00 I'd go to 7.15 and see if it works.

some of those dimensions are too thick to be useful today.
the smallest one may exist only in small lengths is not it ?



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#2162397 - 10/06/13 04:37 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Maximillyan]  
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Originally Posted by Maximillyan
Originally Posted by Olek
Probably less , yes

Isaac, I have one question: Is thread notching Vienna's pin usual? Or it's has the big hight thread?


I have seen crude threading and no thread, but I do not remind much , did not see a lot.


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#2162464 - 10/06/13 10:07 AM Re: Tuning pin replacement size for loose tuning pins? [Re: Upright]  
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Quote
"Correct, these sizes, blued or nickel plated, 5 sizes of length (52 / 55 / 57 / 60 / 64 mm)" - Upright


Dear Upright - If my math is correct, your supplier has 130 types of pins available?! 13 thicknesses X 5 lengths X 2 finishes?

I have a compulsion (my wife says obsession) for purchasing supplies. Fortunately for me, my supplier (Schaff) has a more limited selection of tuning pins:

[img:center]http://[Linked Image][/img]

I'd have to big a bigger set of shelves if I lived over there! Chuck



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K331 Sonata in A
by peterws. 09/24/17 03:44 PM
Double crowned sounding board
by Davepost. 09/24/17 09:04 AM
SSD for samples, NTFS or FAT32
by stamkorg. 09/24/17 07:19 AM
K 545 Trills
by Qazsedcft. 09/23/17 11:04 PM
ES8, what I will miss the most
by EVC2017. 09/23/17 08:06 PM
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