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#2011042 - 01/08/13 07:51 AM Grand Piano Hinge Pins in Schools
UnrightTooner Offline
5000 Post Club Member

Registered: 11/13/08
Posts: 5256
Loc: Bradford County, PA
I have sometimes replaced missing pins on school grand piano lids with balance rail pins. There are a little bit thinner and go in without having to hammer so hard when the hinges get out of whack. It does bother me, though.

Without the "ell" part I keep thinking it could work its way out. Then I tell myself that is silly, it could work its way out even with the "ell".

But I am also bothered that they are not removable without tools, or if someone decided to use tools they would probably ding up the case work. Then I think about how dinged up the case is anyway and the rough use that caused the problem to begin with.

So then I was thinking about using TWO balance rail pins, each with an "ell" and each going only halfway into the hinge from each side. It is not usually hard to get a pin out once you are halfway there. But then why leave the temptation for the students to get at the pins to begin with? The length of the balance rail pins are the same width as the hinges. Nothing sticks out to grab hold of.

Any thoughts?
_________________________
Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?

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#2011075 - 01/08/13 08:53 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
rXd Offline
2000 Post Club Member

Registered: 03/11/09
Posts: 2151
That's a good tip, Jeff. If they can't grab the 'L' they can't take it out. They mightl also think twice about removing the lid if it doesn't look easy. They never thInk of putting the lid back on or keeping track of the pins (or the lid, sometimes).
_________________________
Amanda Reckonwith
Concert & Recording tuner-tech, London, England.
"in theory, practice and theory are the same thing. In practice, they're not." - Lawrence P. 'Yogi' Berra.
Eschew obfuscation.



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#2011124 - 01/08/13 11:13 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
RonTuner Online   content
1000 Post Club Member

Registered: 01/21/04
Posts: 1781
Loc: Chicagoland
I guess it depends on if there is a real reason to remove them. Most schools will never need to take the lid off, so if I notice a pin missing, I replace it with it with a longer one that I bend into a double "L" once it is in place. I found some giant paper clips that are brass colored and about the right diameter. They are soft enough to bend easily with pliers, if the lid needs to be removed.



Ron Koval
_________________________
Piano/instrument technician
www.ronkoval.com


my piano videos:
http://www.youtube.com/profile_videos?user=drwoodwind


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#2011132 - 01/08/13 11:26 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22785
Loc: Oakland
In an emergency, when the proper pin is not available, or the hinge is so whacked up that a pin will not fix, I take some music wire, stick it through, and bend both ends to hold it in place.
_________________________
Semipro Tech

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#2011138 - 01/08/13 11:39 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
Silverwood Pianos Offline
4000 Post Club Member

Registered: 03/10/08
Posts: 4263
Loc: Vancouver B. C. Canada


For grand’s in commercial areas such as restaurants, schools, hospitals, community centres, etc. I take out the hinge pins and put a slight bend in the middle of the length. This way the pins are impossible to remove without a set of grips and small hammer.
_________________________
Dan Silverwood
www.silverwoodpianos.com
http://silverwoodpianos.blogspot.com/
http://www.facebook.com/SilverwoodPianosDotCom
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur."

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#2011145 - 01/08/13 11:50 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
UnrightTooner Offline
5000 Post Club Member

Registered: 11/13/08
Posts: 5256
Loc: Bradford County, PA
An 1/8 inch diameter brazing rod can be used in an emergency, even though it is a bit small, damhik... Might be easier to find than a Goliath sized paper clip.
_________________________
Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?

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#2011148 - 01/08/13 11:55 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22785
Loc: Oakland
Or you could buy brass rods the proper size. Hardware stores carry them.
_________________________
Semipro Tech

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#2011410 - 01/08/13 07:47 PM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
Dave B Online   content
2000 Post Club Member

Registered: 08/01/11
Posts: 2165
Loc: Philadelphia area
I used hair pins once.

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#2011476 - 01/08/13 10:51 PM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
RonTuner Online   content
1000 Post Club Member

Registered: 01/21/04
Posts: 1781
Loc: Chicagoland
A future beginning tech will never know to thank you when you make sure those pins are tough to remove either by the double bend or the kink in the middle...

But they won't have to repair the hinge or refinish the top after watching it slide off the side of the piano while they lift the lid either!

Ron Koval
_________________________
Piano/instrument technician
www.ronkoval.com


my piano videos:
http://www.youtube.com/profile_videos?user=drwoodwind


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#2011539 - 01/09/13 03:06 AM Re: Grand Piano Hinge Pins in Schools [Re: RonTuner]
JohnSprung Offline
2000 Post Club Member

Registered: 08/02/11
Posts: 2085
Loc: Reseda, California
Piano Rule #1: Always check the pins before you lift the lid. ;-)
_________________________
-- J.S.

Knabe Grand # 10927
Yamaha CP33
Kawai FS690

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#2011559 - 01/09/13 05:19 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
Pianos & Pianos Mexico Offline
Full Member

Registered: 10/01/08
Posts: 46
Loc: Mexico
Nice paper clips! Ron they for real?

Once I had this hinge too loose from a fall board desk yamaha type, so i curve the pin a little and the hinge went harder, thinking on that if the balance pin try his way out you can curve it to keep it in place
_________________________
Sergio L. Ruiz Jones
Piano Tech
Pianos & Pianos
Afinación y Restauración de pianos
www.pianosandpianos.com
Sergio.ruiz@pianosandpianos.com
Mazatlán, Mexico.

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#2011566 - 01/09/13 05:49 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
Olek Offline
8000 Post Club Member

Registered: 03/14/08
Posts: 8572
Loc: France
The different diameters, in imperial or in mm are really a trouble ...

Hopefully those hinge rarely make noises, as I have seen anything used, nails, paperclips, NOTHING !!!
_________________________
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.! Euh.... sorry for the lengthy postings, I cannot refrain writing !

https://secure.avaaz.org/en/save_africas_lions_loc/?tcltqeb

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#2011581 - 01/09/13 07:27 AM Re: Grand Piano Hinge Pins in Schools [Re: JohnSprung]
David Jenson Offline
2000 Post Club Member

Registered: 10/22/06
Posts: 2451
Loc: Maine
Originally Posted By: JohnSprung
Piano Rule #1: Always check the pins before you lift the lid. ;-)
Piano Rule #2: Make sure there is someone else to blame if you forget rule #1.
_________________________
David L. Jenson
Tuning - Repairs - Refurbishing
Jenson's Piano Service
-----

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#2011584 - 01/09/13 07:32 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
UnrightTooner Offline
5000 Post Club Member

Registered: 11/13/08
Posts: 5256
Loc: Bradford County, PA
Lift the lid just a couple of inches, waggle it, and then decide about lifting it further. Even if the hinge pins are in place, the hinge screws might not be.
_________________________
Jeff Deutschle
Part-Time Tuner
Who taught the first chicken how to peck?

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#2011647 - 01/09/13 10:33 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
Olek Offline
8000 Post Club Member

Registered: 03/14/08
Posts: 8572
Loc: France
lift the lid a little, and when you are sure there are no hinges lift it all (just wait for someone to stand on the left of the piano before)

Works nicely when there is also only one hinge left, but the results are less spectacular
_________________________
Professional of the profession.
Foo Foo specialist
I wish to add some kind and sensitive phrase but nothing comes to mind.! Euh.... sorry for the lengthy postings, I cannot refrain writing !

https://secure.avaaz.org/en/save_africas_lions_loc/?tcltqeb

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#2011747 - 01/09/13 03:02 PM Re: Grand Piano Hinge Pins in Schools [Re: Pianos & Pianos Mexico]
RonTuner Online   content
1000 Post Club Member

Registered: 01/21/04
Posts: 1781
Loc: Chicagoland
Originally Posted By: Pianos & Pianos Mexico
Nice paper clips! Ron they for real?

Once I had this hinge too loose from a fall board desk yamaha type, so i curve the pin a little and the hinge went harder, thinking on that if the balance pin try his way out you can curve it to keep it in place


That was a random online photo, but I found some a little smaller at the local office supply store and keep a few in my tuning kit. Handy to snip off as much as I need...

Ron Koval
_________________________
Piano/instrument technician
www.ronkoval.com


my piano videos:
http://www.youtube.com/profile_videos?user=drwoodwind


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#2013755 - 01/13/13 01:44 AM Re: Grand Piano Hinge Pins in Schools [Re: UnrightTooner]
James Scott Offline
Full Member

Registered: 08/22/09
Posts: 164
Loc: Phoenix, AZ
Mine came with a couple of nails instead of pins. I eventually replaced the nails with brass rods (as BDB mentioned) with a custom L bend. It's not a school instrument so I don't have to worry much about them being removed, but I do have kids so I suppose that I should start.

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