I don't recommend making your own panels. While I learned things creating a panel, it isn't cost-effective or the best use of my time.
Jerry's Artarama sells 18x24 inch wood panels for ~$33. The panels are offered in many sizes.
Creating a wood panel takes several hours.
The materials cost much more than $33. (Birch plywood ($11), poplar boards for cradle ($24), 4 hardwood dowels, acid free glue)
The archival quality of Jerry's wood panels is difficult to replicate.
Overview
I am retired, and in my retirement, I am going to focus on doing the things I want, such as, painting. Most of my art to date has been copies of other's work. Going forward, I am going to focus on original works.
Canvas is ideal for a very large painting or for paintings that need to be transported.
The oldest paintings were done on panels.
The goal is to make an archival panel, which won't negatively impact the painting.
I prefer the rigidity and texture of a smooth surface provided by a properly created panel.
Jerry's Artarama sells panels in various sizes.
if the panel is not going to be framed, then it requires an internal frame for hanging.
Why Custom Frames are Required:
One reason I wanted to make my own panels is to minimize my costs in retirement. And I was hoping to avoid the cost of custom framing on every painting. However, this is problematic.
I struggle to make a painting that fits a stock frame unless I pick out the matte and frame in advance.
A stock frame's inside is exact measurements. The frame's lip is 3/8 inch.
The issue of using a stock frame arises from the mattes. The matte has random measurements, which guarantees a custom frame. I went to several framing shops and took measurements. I found the same issue at each shop.
A matte has two dimensions of interest: the lip and the width (or the part between the frame and the painting).
The matte width ranges from 1-3/4 to 5/8.
The matte lip is non-standard, and ranges from a bit less than 3/8 to a bit longer than 3/8s.
I like the look a matte adds to a painting.
Parts
Birch plywood 2’x4’x1/4” project boards at Lowe's
Poplar 3/4' x 1-1/2' x 8'
1/4 hardwood dowel rod
Acid free wood Gorilla Glue
2x 1/4 #20 coarse 1-1/2" tapered bolts and nuts
2x 1-1/4 wood screws
Index card
Scotch tape
Paper towels
Blue painters tape
Tools
Rotary sander and very fine sandpaper
Table saw with blade that has at least 200 teeth
Power Drill with 1/4 wood drill bit and counter sink bit
Small hand saw
4x corner clamps
4x hand clamps
Spring clamps
Hammer, Phillips head screwdriver, Xacto knife, sharp wood chisel, measuring tape, sharpened pencil, small flat pull-saw
Part A. Create a jig to cut overlapping corners
Each wood canvas requires 8 overlapping corner joints.
To make these overlapping joints repeatable, create a jig.
Part B. Make the Cradle
Step B1. Cut supports to size
Cut the poplar supports to size.
Step B2. Create an overlap joint
I use an overlap joint instead of an angled join
Lower the table saw blade to 3/4"
Cut the overlap (3/4" x 3/4") notch at the end of each piece of poplar
Use the jig to cut the overlaps
The 3/4" side of poplar boards will be glued to the birch plywood
Step B3. Drill hole for dowel
Add corner clamps
Drill 3/4" hole in corners
Cut 3" pieces of dowel rod
Step B4. Glue
Loosen a corner clamp
Using a small brush, spread the glue on the overlap
Put some glue in the dowel rod hole
Using a hammer, pound a 3" piece of dowel rod into the hole
Tighten the corner clamp
Wipe off excess glue with a damp paper towel
Repeat for the other corners
Wash brush
Let dry for 24 hours
Step B4. Dowels
Remove corner clamps
Saw off the excess dowel rods
Use a chisel or orbital sander to remove excess glue
Part C. Attach plywood to cradle
Step C1. Cut 1/4" birch plywood to size + 1/4 inch
Mark approximate location of cuts
Wrap blue painter's tape around plywood where cuts are to be made
Remeasure and mark on blue tape
Cut on table saw
Step C2. Glue
Spread glue on top of supports with a brush
Place plywood and use hand clamps too apply pressure and keep the plywood from moving
With a damp paper towel wipe off excess glue
Let dry for 24 hours
Use a chisel to remove excess glue. Hand saand if necessary
Do not use an orbital sander on the birch plywood or its edges. It will take off the birch layer
Step C3. Trim to size
Use a fluch router bit to trim to size