Building a Solid pine wood, finger jointed guitar amplifier cabinet.

Picture of Building a Solid pine wood, finger jointed guitar amplifier cabinet.
measuring the four sections to be cut that will become the cabinet.
cutting and numbering the sections of the cabinet
Building a solid pine wood, finger jointed guitar amplifier for my Fender pro Jr.
Done the same way Leo Fender did back in 1946.
There is Nothing like the Warm sound of a pine wood cabinet!

Fender is a licensed trademark for FMIC Not to be affiliated with ampRiser or instructables.com
Remove these adsRemove these ads by Signing Up

Step 1: Measuring the four sections to be cut

Picture of Measuring the four sections to be cut
The Fender pro jr. cabinet measures 14 1/2" H x 15 1/4" W x 8 3/4" D
I wanted the wood grain to match throughout the cabinet,
After purchasing a piece of select pine wood 1" thick 10" wide and 8' in length,
I carefully marked the 4 sections to be cut at 14.5" then 15.25" then 14.5" then 15.25"
Measure Twice CUT Once! Make sure to always were proper safety glasses and
read and understand the proper use of your power tools!
I used my radial arm saw to cut the sections.

Step 2: Numbering the cut sections

Picture of Numbering the cut sections
After the sections are cut I number them so that they will go together in the proper order.

Step 3: Dry fit the sections

Picture of Dry fit the sections
After the sections are cut and numbered in order
for proper assembly.
I dry fit them to see how the cabinet will look,
notice how the wood grain matches and follows
throughout the cabinet.

Step 4: Cutting the finger joints

Picture of Cutting the finger joints
After the 4 sections are cut and numbered 1-4
I set up sections 1 and 3 in my finger joint jig
to be cut with my router.
1" stock is actually 3/4" thick, so I set the depth of cut at 3/4"
sections 1 and 3 start the cutting at an open finger on the jig
sections 2 and 4 start the cutting at the finger of the jig,
that way they are of set and will go together properly.
*Remember to ALWAYS wear safety glasses*

Step 5: Dry fit the cut sections

Picture of Dry fit the cut sections
Once again I dry fit the cut sections to check for proper fit.

(finger jointing a cabinet can be complicated and requires
special tools and skills, so if you want you could skip
these steps and simply assemble the cabinet with out them?)
Aadieu21 days ago
butt joints with bracing all around will do just as well

real simple too. and don't even need a buncha clamps, just glue and NAIL (mesa does it that way, and they've got the beefiest cab builds of the big brands)

bracing butt joints is simple:

> 1 2 2 2 2
1 3 <
1 ^

1, 2 - side boards
3 - brace board
^,<,> - nails with directional vector

glue & nail the brace FIRST, and to board #1 (offset) for a good butt joint with two planes of attachment & double the glue-up surface

important: use a "true" board for bracing... poplar dowels are crap to be avoided. maple can be nice but is crazy hard, difficult to nail, can break improperly/unpiloted screws, and weighs a ton. ALDER is your friend

if you can't find 1x1 (real 0.75x0.75") alder, go with 2x1 (1.5x0.75") and this pattern:

1 3 <
1 3 <
>1 2 2 2 2
Aadieu Aadieu21 days ago

1 2222
1 3
SimonF37 months ago

This is great! I'm just about to get started building a cab for a valve amp I made and this instructable is very helpful. Thanks for posting, and great job on some really neat jointing :)

tedvm7 months ago
from one guitarist to another....I tip my hat to you.
excellent craftmanship!

Question....and if I missed it somewhere in the instructable I apologize. But what's up with the bottom cabinet in the heading picture up there? Looks like a piece of wood obstructing the speaker grille on bottom. Is that the case?

Right now I have a danelectro honytone amp that I am going to make a wooden cabinet for. Your instructable used a thickness of 1". For a mini amp would I have to dial back the thickness?
bike5514 years ago
Where did you find the routing template and how much was is? Thanks chad
ampRiser (author)  bike5514 years ago
Sorry for the delay, havent been here in a while?

I bought the Box Joint Router Template and Jig at...


4 about $40.00?
Re-design4 years ago
Very nice work.
abadfart5 years ago
very nice good craftsmanship  
kelseymh5 years ago
This is very nice, and complete enough for someone to follow and duplicate.

One minor point: it looks like you uploaded all your photos at the beginning (certainly much easier :-). Unfortunately, that has the side effect of also attaching all of those pictures to your introduction. You may want to remove the "in process" pictures from that step (it won't affect where they are in the rest of the I'ble), leaving only the beautiful finish product.

If you're not familiar with the (slightly weird) markup I'bles uses, you could replace your all caps with either italics, putting two apostrophes before and after the text, like this:
        ''like this''
or with bold face, using three apostrophes, like this:
        '''like this'''