Current stringing diagram

Current stringing diagram

Postby Guizmo » Fri Jan 24, 2014 3:01 pm

Hey Guys,

Is this the most up to date stringing diagram? :

STRING ROUTING.png
STRING ROUTING.png (29.32 KiB) Viewed 49931 times


I read somewhere now it was needed to do 2 turns around the bolts.

Thanks!
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Re: Current stringing diagram

Postby Nicholas Seward » Fri Jan 24, 2014 3:20 pm

Do two loops instead of one.

It is not mission critical that you get everything just like this. What is important for tracking is that the active region of the spool is located as low as possible. I have it so that when I am completely closed that I have only 1 loop for one side of the string..
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Re: Current stringing diagram

Postby imrahil » Fri Jan 24, 2014 4:07 pm

I think this topic should be pinned at the top of the forum :)
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Re: Current stringing diagram

Postby Guizmo » Fri Jan 24, 2014 5:40 pm

Ok, I think I was getting things wrong.

The 2 turns are in the spool right, like a string buffer?. I was thinking they were around the bolts :P

So the string route is correct, you just want to make sure there is enough string on the spool to be usable, but not too much to cause diameter changes.

BTW, the active region is the pulling side, right?

Thanks!
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Re: Current stringing diagram

Postby owens-bill » Fri Jan 24, 2014 6:48 pm

The two turns are around each pair of bolts. Here's how I would describe the string path verbally:

- start at the guitar tuner
- wrap around the end of the arm and go under the nearest bolt (left bolt on the motor arm)
- go around the bolt above it (left bolt on the slave arm)
- go around the first bolt
- go around the bolt above it
- go 3/4 around the first bolt and under it, then under the other bolt on the motor arm (near the motor)
- go around the pulley, wrapping clockwise as seen from above, one wrap working downwards (I did two, too hard to hold with just one)
- go up through the vertical hole in the pulley
- wrap many times around the pulley, still clockwise, starting at the top and working down towards the middle (I think I did 11 wraps on each pulley)
- come off the pulley, go under the nearest bolt (right bolt on the motor arm)
- go over the bolt above it (right bolt on the slave arm)
- go around the neared bolt
- go over the bolt above it
- go 3/4 around the nearest bolt and under it, then under the other bolt (left bolt on the motor arm)
- wrap around the end of the motor arm and tie the string to the spring

I wrote that from memory, but after having strung all three arms twice each (once with the previous pulleys, then again with the current ones) I believe I have it right ;)

I've strung the arms both by starting at the pulley and working both strings through and around the bolts, and by starting at the tuner as I described above. I think starting at the tuner is better but it's probably a matter of taste; either way maneuvering the pulley and motor is difficult. Having the access hole in the side of the arm makes that a *lot* easier.

Also, the starting position is with the tips of the arms together; that way the left side bolts are as far apart as they're going to get, and having just a little string on the pulley for them is correct. Also also, my wrapping on the pulley is opposite-handed from Nicholas' diagram; I did it that way so I wouldn't have to reverse my steppers from how they were set up on the prototype. It doesn't matter, you just have to make sure that the arms move in the expected direction when you're done.
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Re: Current stringing diagram

Postby Guizmo » Fri Jan 24, 2014 7:02 pm

Thanks Bill. Much clearer!

In your explanation: shouldn't it be 1/4 of turn instead of 3/4?

Or am I totally confused? :oops:
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Re: Current stringing diagram

Postby tommythorn » Fri Jan 24, 2014 7:03 pm

Guizmo, kindly consider taking photos or video of the process when you figure it out :)
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Re: Current stringing diagram

Postby Guizmo » Fri Jan 24, 2014 8:10 pm

:lol: Yes!
In fact, I'm documenting with good pictures the whole process to make a formal assembly guide. That's why I'm asking everything.
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Re: Current stringing diagram

Postby Guizmo » Fri Jan 24, 2014 8:36 pm

Ok,

Here is a rough modification. Am I right?:

STRING ROUTING B.png
STRING ROUTING B.png (30.6 KiB) Viewed 49890 times
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Re: Current stringing diagram

Postby Nicholas Seward » Fri Jan 24, 2014 9:16 pm

Perfect! Thanks!!!
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