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Tuning pin size #1513896
09/12/10 04:09 PM
09/12/10 04:09 PM
Joined: Jun 2010
Posts: 33
S
steppinthrax Offline OP
Full Member
steppinthrax  Offline OP
Full Member
S

Joined: Jun 2010
Posts: 33
I'm measuring the tuning pins in my piano to determine what size tuning hammer is required. I notice the pins taper off with the smallest end on the top and the largest end at the bottom. I'm getting these measurments when using a micrometer.

top (narrow) = 6.22mm (.244")
bottom (before the coil) = 7.25mm (.285")

length (between coil and end) = 1.5mm

I'm thinking a 2/0 hammer would work?

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Re: Tuning pin size [Re: steppinthrax] #1513901
09/12/10 04:21 PM
09/12/10 04:21 PM
Joined: Apr 2009
Posts: 407
Morgantown, West Virginia
D
Dan Casdorph Offline
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Dan Casdorph  Offline
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Joined: Apr 2009
Posts: 407
Morgantown, West Virginia
We dont measure the tapered end to replace pins, we measure the threaded portion. I don't remember the numbers as my guage says 1 2 3 4 beside the holes. Most likely you need a #2.


Casdorph Piano Service
Morgantown, WV
www.casdorphpiano.com
All pianos are bald ones.
Re: Tuning pin size [Re: steppinthrax] #1513915
09/12/10 04:43 PM
09/12/10 04:43 PM
Joined: Apr 2010
Posts: 1,920
Michigan
K
kpembrook Online content
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kpembrook  Online Content
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Joined: Apr 2010
Posts: 1,920
Michigan
Originally Posted by steppinthrax
I'm measuring the tuning pins in my piano to determine what size tuning hammer is required. I notice the pins taper off with the smallest end on the top and the largest end at the bottom. I'm getting these measurments when using a micrometer.

top (narrow) = 6.22mm (.244")
bottom (before the coil) = 7.25mm (.285")

length (between coil and end) = 1.5mm

I'm thinking a 2/0 hammer would work?


This is a common mistake that people make about tuning pin size and tuning tip size. There is no connection whatsoever.

Tuning pin size (2/0, 3/0, etc.) has to do with the diameter of the threaded portion of the tuning pin.

Given that the head of the tuning tuning pin is tapered -- as is the interior of the tuning hammer (or lever, take your pick) tip is also conical, any tuning tip should fit any tuning pin.

So what is the reason for the tip size of #1, #2, #3? It is to provide a varying "sweet spot" of two opposing parameters to meet the personal preference of the individual technician. Ideally, the fit would be tight on the pin and low on the pin. However the reality is that the choice is 'high and tight' (#1) or 'low and loose' (#3). I can use any tip, but happen to prefer the #3 tip simply because I am most comfortable with "low and loose". This means nothing at all for anyone else. I have other colleagues who use all sizes, heights, and shaft angles of tuning hammer tips. They all work -- and work well. It's just a matter of personal preference.

Where someone has no basis for their own opinion, I suggest starting with a #2 and figure it out from there. Whatever you do, don't stress out over the choice. Most of the theories, philosophies and opinions favoring one height, angle or size over another are inconsequential at best and invalid at worst.

Good luck!



Keith Akins, RPT
Piano Technologist
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair
Editor Emeritus, Piano Technicians Journal

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