An alternative theory for Pirastro string roll
So, I finally got to try a (second hand) set of EP Weichs on my bass. They're pretty cool and I'm trying to work out whether they will replace my Spiro Mittels. However, they have a bit of the dreaded string roll but I noticed that, before I put them on, they had a spiral-twist down their length (ie, laying one flat would be like looking at a coil spring, albeit one with very few coils in it). I think this develops due to a twisting motion that occurs when winding a string onto the peg. It's like pinning one end down (ie, at the tailpiece) and then repeatedly twisting the string from the other end (the action of the turning tuning peg); I once had some guts that effectively unwound down their length somewhat due to this problem.
I reckon that the Pirastro synthetic core eventually adopts this twist permanently due to plastic 'creep', so when I detected the string roll when they were on the bass, this got me thinking: Perhaps the roll is due to the twist, rather than the 'loose core' problem that people talk about with Pirastro strings (particularly Obligatos). I think that initially the twist is tight (like winding a coil spring tighter), but as the material gives, it loosens up and ends up acting like a long spring of low coil tension which you can roll it along its length.
In the case of these strings on my bass, I think that my tuners may have a different number of turns (fewer) required to bring the strings up to tension compared to the bass of the string's previous owner. Either that, or my tendency to prewrap the string around the peg before pinning the end in the peghole has effectively reduced the number of twists introduced by the winding motion.
If this is correct, then it means the solution to string-roll is to remove and restring (without prewrapping).
What do people think of this theory?
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Last edited by swingingoodtime : 10-05-2013 at 02:55 AM.