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Date: | Mon, 20 Nov 2017 17:31:55 -0700 |
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The Spiral Pitch: John Larson & Peter Bavington have suggested that it is
the pitch of the spiral causing problems. I have to admit I wasn't
monitoring the pitch carefully. I just happy that I could spiral it down
the wire and keep it tight! I have copied an updated string list including
the original pitch and 4 measurements of my pitch. Mine were all at least
1/2 of what they should be, too dense/tight. I have spent this afternoon
making 3 more strings striving to get a 2mm pitch. The first one I was
able to tune up to pitch (F#) without a hitch and the pitch is 2mm! The
second, tuned up to almost F# and then broke. Measuring this bad 2nd
string I noticed that the pitch was closer to 1.5mm. For the 3rd string I
took the piece of leather that I was pinching the Cu-wire to apply tension
with and made 2mm marks along the edge so I had something to eye-ball up
the 2mm spiral better. The 3rd string also tune up to F# without a
problem! So I think my entire problem was too close of spirals.
So how do the professionals manage to spiral exactly 1.5mm, 2.0mm, 2.5mm or
3.0mm pitches? Is there a trick or just practice like hand-cut dove-tails?
Peter: Do you have a reference that I can look up to perform the tension
calculations myself? I am a geochemist so the math sounds interesting.
My Two successful splices: I George Debono & Michael Dunn: I managed to
make a small hitch-pin loop on the broken end of the old string, to the
right of the bridge and another hitch-pin loop on a short section of 0.018"
wire. Then I just slipped the loop over the other loop and fed the end
through the other's loop and pulled tight to make a sort of square note.
My proper piano-wire square knot tests didn't really hold up too well.
These splices don't look nice and I am not sure they will last the week but
lets see! I like your comment about soldering the twisted wire together.
I will give that a try next time after I re-wind some more strings with
broader spirals/pitch.
Tomorrow I will try to make a few more. If my girl friend is still willing
to turn the crank!
Thanks for the suggestions and I will keep the list informed of my progress
in the following days.
Phil
String #Note #1 Speaking Length_1 Yellow_Brass_Core Cu_Wrap Spiral Pitch
Winding Angl Pitch_MY_WIRE
1 C 1097 0.016 0.016
0.079”/2.0mm 50 0.041”/1.04mm
2 C 1097 0.016 0.016
0.079”/2.0mm 50
3 C# 1082 0.016 0.016
0.091”/2.3mm 46
4 C# 1082 0.016 0.016
0.091”/2.3mm 46
5 D 1069 0.016 0.012
0.055”/1.4mm 57 0.033”/0.8382mm
6 D 1069 0.016 0.012
0.055”/1.4mm 57
7 Eb 1054 0.016 0.012
0.063”/1.6mm 54
8 Eb 1054 0.016 0.012
0.063”/1.6mm 54
9 E 1038 0.016 0.012
0.071”/1.8mm 51
10 E 1038 0.016 0.012
0.071”/1.8mm 51
11 F 1022 0.016 0.012
0.083”/2.1mm 47
12 F 1022 0.016 0.012
0.083”/2.1mm 47
13 F# 1007 0.016 0.012
0.098”/2.5mm 42
14 F# 1007 0.016 0.012
0.098”/2.5mm 42 0.024”/0.6096mm
15 G 986 0.016 0.012
0.118”/3.0mm 36
16 G 986 0.016 0.012
0.118”/3.0mm 36
17 G# 968 0.016 0.010
0.051”/1.3mm 56
18 G# 968 0.016 0.010
0.051”/1.3mm 56
19 A 948 0.016 0.010
0.063”/1.6mm 51
20 A 948 0.016 0.010
0.063”/1.6mm 51
21 Bb 923 0.016 0.010
0.079”/2.0mm 45 0.026”/0.66mm
22 Bb 923 0.016 0.010
0.079”/2.0mm 45
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