It took less than 30 minutes to cut, machine, apply glue and get this door in the clamps. A little finish sanding and it is ready for use. Click image to enlarge

Building Tongue and Groove Doors

Simple Tools, Solid Results

Text & Photos by Tom Hintz

   Building tongue and groove doors is easier than you might think, and you do not need an array of fancy tools to do it. Depending on the wood used, these simple-to-build doors can be used on shop cabinets or upscale interior applications.

   If this construction look familiar that may be because the same techniques are used to build dust and drawer frames for dressers and other cabinets. The rails and stiles are usually narrower, but the rest remains identical.

Sizing the Rails & Stiles

   Look at ready-made panel doors and measure the width of the rails (horizontal parts top & bottom) and the stiles (vertical sides) on doors that look good to you. You can alter these dimensions somewhat if you like but don't get carried away. Often the rails are a little wider than the stiles, the amount dependent on the overall size of the door.

   Measure the opening being covered and figure out the height and width of the finished doors. Remember to add the amount you want the doors to overlap the opening. 3/8 to ½" is usually a sufficient overlap.

Make small adjustments to the fence position to "sneak up" on the correct groove width for the panel material. Click image to enlarge

   Note: When cutting the rail and stile pieces, I usually cut them ¼" longer than what is needed to achieve the finished size of the door. This allows a little room to trim the completed door to final size and eliminate small irregularities at the joints and make it square.

   The stile length equals the finished height of the door as they run full length, top to bottom.

   To figure the length of the rails, take the finished width of the door, subtract the combined widths of the stiles and then add one inch to that. The extra inch is for tongues that will be cut at either end of the rails.

   (Remember, if you want to make the door slightly oversize, add that ¼" to these dimensions.)

Groove the Rails and Stiles

   Set the table saw blade height to ½". Adjust the fence so that the blade is very close to centered on the thickness of the wood. Run the inside edge of all rail and stiles over the blade, turning each of them end-for-end and making a second pass over the blade to center the groove.

The panel should fit the groove easily, but not so loose it rattles. Click image to enlarge

   At this point, the groove should be too narrow for your plywood to fit in it. Move the fence away from the blade slightly and repeat the cuts, again turning the pieces end-for-end and making a second pass to keep the grooves centered. Repeat this process, checking the fit of the plywood after each cut until the plywood fits in the groove. The plywood should slip into the groove with little force but not be loose in the groove.

Cut the Tongue

   Clamp a gauge block to the fence and set the distance from its face to the far side of the blade to ½". Lay one of the frame parts flat on the table and set the blade height to a little below the groove for the initial cuts.

   Using the miter guide, hold a scrap piece (same thickness as the frame parts) close to the gauge block and then slide it over the blade a couple of times,

(Top) Use a frame part to set the initial blade height for cutting the tongue. (Center) Make sure the gauge block is 1/2" to outside of the blade, not the inside edge! (Bottom) This is what the tongues on the rails should look like. Click images to enlarge

nibbling the wood back ¼" or so. Flip it over and do the same thing on the other side to form a short tongue. Check the fit in the groove. It should be too big yet but will provide an indication of how much material remains to be removed. Raise the blade slightly and repeat the process until the tongue fits in the groove snugly, not tight. When satisfied with the blade height, run both ends of the rails, cutting the material back the full ½".

   Start each tongue by placing the piece against the gauge block and then sliding forward over the blade. This cuts the shoulder of the tongue. Nibble the remaining material from that cut to the end of the tongue before flipping the piece over and repeating the process on the other side.

   Check the end of the rails where the tongue meets the groove. Using a sharp utility knife, cut away any remaining stock that could interfere with the panel fitting into the groove when the door is assembled.

   Test fit the rails in the stiles and place in clamps. The joints should pull together with slight clamp pressure. If the tongues hold the joint apart, use a block plane or rasp to shorten the tongues a small amount until the joints close.

Measure for the Panel

   With the rails and stiles still in the clamps, measure the

Add 7/8" to the height and width of the frame opening to size the panel. Click image to enlarge

opening side-to-side and top-to-bottom. Add 7/8" to both dimensions to get the final size of the center panel. Cut the panel to size and test fit in the frame, using the clamps again to close the joints. Make sure the joints close and the panel is not holding the frame apart anywhere. When satisfied, take the door apart.

Assemble the Door

   Apply glue to the ends of the rails and to the stiles in the area that contacts the rails only. No glue goes in the groove to retain the panel. Assemble the doors, put in clamps and squeeze the joints closed. Make sure the door is flat in the clamps, is square and the ends of the

Apply glue only to the rail ends and where they contact the stiles. Click image to enlarge

stiles are flush with the rails. Let it dry completely.

   After drying, scrape off any excess glue and sand the joints smooth. If you oversized the door for trimming, do that now. Take very light cuts to just clean the edges up until the door is at the final size.

   The outer edge of the doors can be routed for decoration if you like before final sanding and finishing.

Poof!
   You're done!

Resources

Mortise & Tenon Joints Made Easy
The procedure for sizing the tenons is exactly the same for making the tongues.
Using a Combination Square to Set Blade Height
An easy way to get it right.
Using a Gauge Block
A safety procedure you need to know and use!

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