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Topic: Misbehavin lever - A mechanical riddle for you |
Alex Cattaneo
From:
Quebec, Canada
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Posted 27 Dec 2012 8:01 am |
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Hey guys, this is for the mechanically inclined. Knock yourself out!
Set-up:
String 6 and string 1 connected to RKL lever.
Split tuning screw on string 6. String 6 lowers G# to F# with G natural when using the B pedal. So the F# is set by the hex screw and the G natural is set by the nylon hex tuner.
String 1: raise F# to G#
Behavior:
Here is how the 6th string behaves. Open string is in tune at G#. With RKL activated, it is in tune at F#. So that's ok. Bring in the B pedal with the lever, and it's out. So I tune that with the nylon hex tuner. If I mash the b pedal in and out, it stays in tune. It's releasing the lever that causes that note (G natural) to go out. Meanwhile, the G# (no pedal no lever) and the F# (lever only) stay in tune. Since the open string remains in tune, I'm thinking travel is ok.
String 1 behaves pretty much the same. Open string is ok, but the raise is acting funny. Tune the raise up to G#, release the lever, activate it again, it's way sharp. Tune it down to G#, release the lever, activate it again, now it's way flat. The open string stays in tune.
What do you make of that? |
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richard burton
From:
Britain
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Posted 27 Dec 2012 8:33 am
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Sometimes, with split tuning, you have to activate the pedal and lever in the same sequence every time, to get the correct note, ie you may have to always activate the lever before the pedal, and not vice versa.
The first string problem makes me think that the lower return spring is not quite tight enough, and therefore acting inconsistently, so when you initially tune it to G#, the spring has not held the lowering segment in place, but the next time you activate the lever, the spring might hold the segment in place, resulting in a sharp note. |
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Alex Cattaneo
From:
Quebec, Canada
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Posted 27 Dec 2012 8:56 am
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Richard, you are a gentleman and a scholar.
I did not know about the sequence. I am used to the tunable split system on the Sho-Bud, which is quite different from a split tuning bar. So if tune it for lever-then-pedal, I have to make sure not to play pedal-then-lever. You learn something everyday. Now I just need to decide which sequence I prefer. Input on the matter welcomed.
String 6 is solved!
String 1: maybe tightening the spring a little. I'll try that. |
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