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String deflection #2600827
01/03/17 10:57 PM
01/03/17 10:57 PM
Joined: Nov 2010
Posts: 134
East TN
meadpiano Offline OP
Full Member
meadpiano  Offline OP
Full Member

Joined: Nov 2010
Posts: 134
East TN
How is the amount of force required to deflect a piano wire calculated? I want to find this so I can calculate how much downbearing force a single and/or set of strings will give at a specific deflection distrance.

Thanks,


Daniel Bussell MPT
Mead Piano Works
East Tennessee

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Re: String deflection [Re: meadpiano] #2600829
01/03/17 11:05 PM
01/03/17 11:05 PM
Joined: Oct 2004
Posts: 1,205
Nor California Sacramento area
D
Dale Fox Offline
1000 Post Club Member
Dale Fox  Offline
1000 Post Club Member
D

Joined: Oct 2004
Posts: 1,205
Nor California Sacramento area
Multiply the sine of the angle by the string tension for downbearing force. For example the sine of 1 degree is .0175. So, if you have a deflection of 1 degree and a string tension of 160 pounds then:

160 x .0175=2.8

It's fairly straightforward math.

Edit:
Of course in theory it's simple but in practice it's a complex system and theoretical downbearing is almost never what the actual measured downbearing ends up being.

Last edited by Dale Fox; 01/03/17 11:08 PM.

Dale Fox
Registered Piano Technician
Remanufacturing/Rebuilding
Re: String deflection [Re: meadpiano] #2600841
01/03/17 11:40 PM
01/03/17 11:40 PM
Joined: Nov 2010
Posts: 134
East TN
meadpiano Offline OP
Full Member
meadpiano  Offline OP
Full Member

Joined: Nov 2010
Posts: 134
East TN
OK that helps! I was thinking it was more complicated than that. I thought the diameter (gauges) would give some variation through A0-C88. But maybe it's just not a significant difference?


Daniel Bussell MPT
Mead Piano Works
East Tennessee


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