# Mortise Depth Rule

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A mortise into a 34 wide part should be about 12 deep. I calculate the mortise length at 12 to 23 of the width of the rail stock longer on wider stiles.

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### Maybe i should talk like my second son and say the mortise should barely hold the tenon you see patrick is a civil engineer with a specialty in bridges.

Mortise depth rule. Stock width and considering mortises that will be adjacent perpendicular to one another. What is the general rule of thumb for making a mortise in terms of mortise depth vs. The tenon should always be longer than it is wide so that when a racking force is applied the tenon can not twist out of the mortise without breaking.

Using these rules of thumb on 1 12 wide 34 stock the mortise would be 1 deep and 14 wide and the tenon would be 14 thick and would not exceed 1 14 wide. Insert the tenon through the mortise and lightly scribe a line around the exposed end of the tenon photo below. I find that this usually provides sufficient gluing surface without making the mortise so deep that it becomes difficult to cut.

In a blind mortise as you were referring to the depth of the mortise should be about 23 of the width of the part being mortised. But a practical limit is reached at about 23 the width. So for example for a matching 3 4 2 stile and rail first make the stiles mortise 1 1 2 long 1 4 wide and 11 3 8 deep.

The deeper hence longer the tenon the better for strength. For a blind mortise the mortise depth should be 23 the width of the board being mortised. Here are some standard rules of thumb which are good guidelines but actual dimensions can vary a bit ie i use a 38 mortise and tenon in 34 stock.

The rule i follow which came from observing antique furniture regards the ratio of length to width rather than length to thickness. Then make a tenon sized for a snug fit without forcing leaving it about 1 16 short of the mortise depth to allow for glue. Maybe i should talk like my second son and say the mortise should barely hold the tenon you see patrick is a civil engineer with a specialty in bridges.

Finish tenon and assemble. 1 tenon thickness should be 13 the thickness of the stock being mortised to ensure the stock being mortised doesnt weaken. Back to square onesigh.

The mortise depth has to be sufficient to house the tenon. The mortise depth has to be sufficient to house the tenon. Separate the joint parts and sand or plane a 450 bevel on each tenon face and edge until it reaches the scribed line second photo below.

The mortise depth is calculated as 23 of the thickness of the mortise stock.

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