Pine bass tester

[Jazzdogg]

Given a properly mixed adhesive, even application of adhesive in appropriate quantity, full observance of allowable open time, and a clamp/caul setup that applies pressure evenly: is it possible to apply too much pressure, because this squeezes out too much glue, leaving too little behind to make a strong/proper joint? Or perhaps, given the assumptions just listed, is it so unlikely as to be not a worry (even if it is not known for certain whether it is possible)?

The short answer is, given the above conditions: Don't worry!.

FWIW, I usually aim for minimal squeeze-out along the glue line, and either (1) wipe it away thoroughly using damp rags while the glue's still wet, or (2) wait until the squeeze-out is the consistency of a rubber band and peel it off with a sharp chisel. If you wait too long, e.g., overnight, you're likely to pull up wood fibers as you remove the dried glue .

 

[pilotjones]

Thanks, guys. I just asked because I was reading something on gluing on the FPL website that mentioned glue starvation, and I wondered whether it was yet another thing to worry about (especially after seeing the neck lam in the other thread that was either under-clamped under-jointed).

 

[allenhumble]

What would be the best way to glue up a wedged neck? (center piece is cut to taper and outside pieces run with grain at an angle.)

 

[Jazzdogg]

Thanks, guys. I just asked because I was reading something on gluing on the FPL website that mentioned glue starvation, and I wondered whether it was yet another thing to worry about (especially after seeing the neck lam in the other thread that was either under-clamped under-jointed).

What's the FPL website? Got a link?

Most of the failures that I've seen that were blamed on so-called starved glue joints were attributable to other causes:

Bad joinery
Too little glue
Using the wrong glue
Incorrectly applied glue
Waiting too long after glue application to commence clamping
Glue gone bad (expired, past its prime, sticky no mo...)
Improperly mixed glue
Bad clamping
Improperly prepared wood
...and the beat goes on...

 

[DSB1]

OK, a question I've always wondered about. A slight tangent, but I think an appropriate one.

I've heard of getting a low-strength joint because it is "glue-starved". If I remember correctly, I read somewhere that this can result from too much squeeze-out, from too much clamp force. Am I remembering wrong? Does anyone have any experience with this?

This can most certainly happen. I've had to redo a few odd parts years ago when I was just starting out because of this.

Once again, more is not always more.

How many clamps you ask? To summarize, it depends on the type of clamp being used and the thickness of the caul. Thicker caul = less clamps (because it can more evenly distribute force).

A good general rule of thumb to remember is to visualize a cone (the pressure from the clamp) spreading out from the bottom of the screw on your clamp. Is your joint inside that cone, and thus getting pressure from the clamp? Are there too many "cones" overlapping in one area?

EDIT: I posted this before reading the rest of the thread. Jazzdogg covered this in detail but I'll leave my post up to help illustrate

 

[pilotjones]

What's the FPL website? Got a link?

Miain entry:
Invalid Link Removed

There's tons of stuff hidden behind there, if a bit hard to find it what's relevant to your interests.

 

[JSPguitars]

I totally agree someone can use too many clamps and/or too much pressure....I did this just the other week on a 'transition block'.
I posted after reading this thread:

http://www.talkbass.com/forum/showthread.php?t=383367

and i just know more of my mistakes have been a result of poorly distributed clamping pressure or lack of sufficient clamps, which I was assuming might be more common with beginning builders. So my comment was influenced by reading that thread.

 

[Jazzdogg]

Miain entry:
Invalid Link Removed

There's tons of stuff hidden behind there, if a bit hard to find it what's relevant to your interests.

Thanks. Great site. At school we refer to it as the Forest Products Lab; guess I'm not quick-witted enough to correlate the initials with the full name this week: gradually losing my faculties (hair, hearing, knees, memory...) is one of the things I dislike most about the aging process