HELP - Precision Bass has developed a warped neck

  • Thread starter Thread starter johnnymegabyte
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32-20-Blues said:
Stiff and brittle don't come into it. Read this, it's a great explanation:

http://www.noyceguitars.com/Technotes/Articles/T3.html

Like Lt. Bob said, pitch is governed by the interplay between tension, length and mass (what I'd call mass per unit length).
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Hi mate long time no see.

Just for the record this has been pointed out to him long before now not just in this thread but in others long ago.

You are all wasting your breath.

Just focus on basic school physics for now, post #21 and then again #26 asked the question. All he is accomplishing right now is making train wreck of some genuine OP's request for usable relevant information.
 
Lt. Bob said:
IMO they open and close because of temperature change and not humidity.
My concrete driveway does the exact same thing and it's certainly not because of the concrete absorbing water. It's because the sun heats it up causing it to expand. Bridges do the same thing which is why they have expansion joints in them.
Same thing on your house.

As for the string getting stiffer or more brittle ...... that still wouldn't change the mass and therefore wouldn't change the pitch or tension.
And I can't see how a string would just get stiffer sitting there. Metal changes elasticity for specific reasons ..... and just sitting there doing nothing isn't one of them.
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I keep my house 68 degrees. Well I am interested to see what happens with my experiments.
VP
 
muttley600 said:
Strings and their pitch are dependant on three properties. Their mass per unit length, the tension, and the string length. Exactly which one of these properties changes?
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Shit, didn't read the full thread, totally missed this.

Sorry for repeating you, Muttley. :o
 
Just for the record to clear up some of the other nonsense being posted in this thread.

It is provable and accepted by those that work with timber from the construction industry to fine joinery that the movement in service of timber occurs in three principle directions. Tangentially, radially and longitudinally. The movement tangentially is greatest followed by radially. The movement longitudinally is so small in all timbers to be negligible to all but the most demanding structural applications.

This isn't opinion this is fact and has been well documented.

Glad we could clear that one up to. Thank me later.
 
muttley600 said:
Just for the record to clear up some of the other nonsense being posted in this thread.

It is provable and accepted by those that work with timber from the construction industry to fine joinery that the movement in service of timber occurs in three principle directions. Tangentially, radially and longitudinally. The movement tangentially is greatest followed by radially. The movement longitudinally is so small in all timbers to be negligible to all but the most demanding structural applications.

This isn't opinion this is fact and has been well documented.

Glad we could clear that one up to. Thank me later.
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Please explain: "The movement longitudinally is so small in all timbers to be negligible to all but the most demanding structural applications".
VP
 
Victory Pete said:
Please explain: "The movement longitudinally is so small in all timbers to be negligible to all but the most demanding structural applications".
VP
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Well, I know this because on leaving schoOl I apprenticed as acabinet maker with five years experience at Rolls Royce and British Aerospace in their wood shops. I also know this because I have a degree and doctarate in musical acoustics and material science. I also know this because I have around thirty years experience building guitars and repairing them as well as teaching the subject at degree level. I also know this because thirty seconds of my life that I will never get back lead me to google and we have this. There are many other credited and reliable sources for this information. It is not hidden or secret in any way. Neither is it new or in anyway my idea or opinion.

A book of knowledge
 
muttley600 said:
Well, I know this because on leaving schoOl I apprenticed as acabinet maker with five years experience at Rolls Royce and British Aerospace in their wood shops. I also know this because I have a degree and doctarate in musical acoustics and material science. I also know this because I have around thirty years experience building guitars and repairing them as well as teaching the subject at degree level. I also know this because thirty seconds of my life that I will never get back lead me to google and we have this. There are many other credited and reliable sources for this information. It is not hidden or secret in any way. Neither is it new or in anyway my idea or opinion.

A book of knowledge
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Okay, But isnt "negligible" still a measurable amount?
VP
 
Victory Pete said:
Okay, But isnt "negligible" still a measurable amount?
VP
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VP, let it go man. How much proof do you want?

There are figures available for nearly every timber and there are standard tests used to establish those values. There are international standards that make the data reliable and accessible. There are tests that are carried out on timbers to establish all of the material properties just the same as there are for all materials.

If you really want a simple test to prove this to yourself I can outline one for you that I get first year students to do. It really shouldn't be required though. Just take me at my word and believe what you have just read.
 
muttley600 said:
VP, let it go man. How much proof do you want?

There are figures available for nearly every timber and there are standard tests used to establish those values. There are international standards that make the data reliable and accessible. There are tests that are carried out on timbers to establish all of the material properties just the same as there are for all materials.

If you really want a simple test to prove this to yourself I can outline one for you that I get first year students to do. It really shouldn't be required though. Just take me at my word and believe what you have just read.
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So are you saying that humidity doesnt change the neck and trussrod relationship?
VP
 
Victory Pete said:
So are you saying that humidity doesnt change the neck and trussrod relationship?
VP
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No I am not. What gave you that idea?

I am saying that you don't understand exactly what a truss rod does, how it works and the way materials behave.
 
Muttley, I was the first person to suggest adjusting the truss rod, but you said in another post that doing so could permanently damage the instrument if you're not careful. What happens? Is it just people cranking it too hard and breaking it the rod, or are there other issues that can arise (wood-warping and such)? Just wanted to be aware of it, so I don't damage my own instruments, and so I'm not one more jerk perpetuating misinformation.
 
muttley600 said:
No I am not. What gave you that idea?

I am saying that you don't understand exactly what a truss rod does, how it works and the way materials behave.
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Of course I understand what a truss rod does and how it works. You must be kidding.
VP
 
danw said:
Muttley, I was the first person to suggest adjusting the truss rod, but you said in another post that doing so could permanently damage the instrument if you're not careful. What happens? Is it just people cranking it too hard and breaking it the rod, or are there other issues that can arise (wood-warping and such)? Just wanted to be aware of it, so I don't damage my own instruments, and so I'm not one more jerk perpetuating misinformation.
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I cautioned him not to tinker because if things have gone that far off and it isn't a loose bridge or neck joint there is a good choice that something has gone wrong with the truss rod. A lot depends on how bad it is. Those fender rods, especially the early ones are locked in place with a pretty crude barb and they can bite and slip on rare occasions and also snag, slip, or just fail if the barb lets go or chews up too much wood. I'm not suggesting that that is the problem by any means just that there isn't enough info to go on yet.

If you re read the reply I was particularly interested to get some more info out of him., Its pretty hard to make a full diagnosis going on what he posted.

It may well be a truss rod adjustment is all that's needed but I wouldn't want to be the one to make it worse for him without knowing more info that's all.

I wasn't digging at anyone else as I said just had enough of VP and his train wrecks.
 
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