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#2116871 - 07/13/13 06:36 AM Yamaha C7 hammer boring angles
mariotto Offline
Full Member

Registered: 05/19/12
Posts: 56
Loc: EU
Does anyone perhaps have the hammer boring angles for Yamaha c7, year 1974, model with 23 bass?

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#2116933 - 07/13/13 10:51 AM Re: Yamaha C7 hammer boring angles [Re: mariotto]
kpembrook Offline
1000 Post Club Member

Registered: 04/06/10
Posts: 1294
Loc: Michigan
No, but your piano will tell you.
_________________________
Keith Akins, RPT
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair

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#2116937 - 07/13/13 11:05 AM Re: Yamaha C7 hammer boring angles [Re: mariotto]
mariotto Offline
Full Member

Registered: 05/19/12
Posts: 56
Loc: EU
Yes I know smile It is a long story.... It will cost me another two weeks to complete my order, until I will be able to measure it myself...

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#2116956 - 07/13/13 11:49 AM Re: Yamaha C7 hammer boring angles [Re: mariotto]
Ed McMorrow, RPT Offline
1000 Post Club Member

Registered: 12/09/12
Posts: 1875
Loc: Seattle, WA USA
Probably better to wait and get the specs from the piano. You never know some on-line rascal could give you wrong specs on purpose.
_________________________
In a seemingly infinite universe-infinite human creativity is-seemingly possible

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#2116959 - 07/13/13 11:54 AM Re: Yamaha C7 hammer boring angles [Re: mariotto]
Olek Offline
7000 Post Club Member

Registered: 03/14/08
Posts: 7178
Loc: France
Hello, you can use a "standard" bore order on a piano that size.

the concern could eventually that the bore proposed have too strong angles, (often they angle up to note 65 while it is not always necessary) the other way around is not really a concern.

Hammers are all the same dimension so that part is easy.

You could also use a picture from above to have an idea of the angles. they can be a little less pronounced than originally, that will help with travelling and other things.

I am unsure but seem to recall 10>11 gon for basses and 110- even 108) to 100 grad for the first medium section.


Edited by Olek (07/13/13 01:13 PM)
_________________________
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#2116978 - 07/13/13 12:56 PM Re: Yamaha C7 hammer boring angles [Re: mariotto]
pianolive Offline
Full Member

Registered: 09/09/11
Posts: 325
Loc: Europe
You could also send samples to the hammer maker. First and last hammer from each section including tha shanks.

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#2116997 - 07/13/13 01:30 PM Re: Yamaha C7 hammer boring angles [Re: mariotto]
BDB Offline
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21266
Loc: Oakland
Or you could ask the supplier.
_________________________
Semipro Tech

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#2117049 - 07/13/13 03:13 PM Re: Yamaha C7 hammer boring angles [Re: mariotto]
Olek Offline
7000 Post Club Member

Registered: 03/14/08
Posts: 7178
Loc: France
I asked a lot of time and never was given any boring data by my supplier, even "standard" boring (which is common for uprights)

Secrecy ! It could be easy to measure so I dont understand the point and it is not easy to understand the refernces of pre bored heads then.
_________________________
Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

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#2117097 - 07/13/13 04:55 PM Re: Yamaha C7 hammer boring angles [Re: mariotto]
mariotto Offline
Full Member

Registered: 05/19/12
Posts: 56
Loc: EU
Yes I asked too. Interesting, I was given an offer for Yamaha bored and glued to shank hammer set for the model, but it is too expencive to me. So, there are somewhere the proper measures. I assume by Yamaha is like by Steinway, for all models it is possible to have all the data, or not? Steinway also offers preglued hammers to shank if you give them the serial number of the piano. I thought there is something similar for Yamaha. Never mind I will wait until I get home and take the proper measurement.

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#2117390 - 07/14/13 07:12 AM Re: Yamaha C7 hammer boring angles [Re: Ed McMorrow, RPT]
David Jenson Offline
2000 Post Club Member

Registered: 10/22/06
Posts: 2034
Loc: Maine
Originally Posted By: Ed McMorrow, RPT
Probably better to wait and get the specs from the piano. You never know some on-line rascal could give you wrong specs on purpose.
Drat! 'Foiled again. I was about to type a mildly malicious answer. wink
_________________________
David L. Jenson
Tuning - Repairs - Refurbishing
Jenson's Piano Service
-----

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#2117398 - 07/14/13 07:52 AM Re: Yamaha C7 hammer boring angles [Re: mariotto]
Olek Offline
7000 Post Club Member

Registered: 03/14/08
Posts: 7178
Loc: France
Well I have seen a 1890+- Chickering grand where all hammers where bored the same direction (bass hammers with the orientation of medium hammers if I recall correctly) .

Don't know if they where original or if someone bored them that way.
_________________________
Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

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#2117499 - 07/14/13 01:13 PM Re: Yamaha C7 hammer boring angles [Re: David Jenson]
mariotto Offline
Full Member

Registered: 05/19/12
Posts: 56
Loc: EU
Originally Posted By: David Jenson
Originally Posted By: Ed McMorrow, RPT
Probably better to wait and get the specs from the piano. You never know some on-line rascal could give you wrong specs on purpose.
Drat! 'Foiled again. I was about to type a mildly malicious answer. wink

smile

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