Furniture makers seldom fashion chair seats from a single piece of wood.
Repair split wooden chair seat.
Drill holes for the dowels in each side of the broken seat about 1 inch deep or as deep as possible and spaced about 4 to 6 inches apart.
While this will put the chair back together it may happen again.
A split seat on a wooden chair often sends it to the junk heap but this solution may save one at your house.
Instead they glue planks together edge to edge to form a single plank wide enough.
How to repair cracks in a chair seat.
The fix begins by forcing wood glue into the crack and clamping the seat back together.
If nails were used previously in the repair of the split chair seat pull them out with the help of angled pliers.
Use a wood stir stick to have more leverage and to protect the finish of the wood from scratches and dents.
Old glue that remains on the frame can be chiseled off.
With the seat clamped up reassemble the chair.
Then add some pressure across the grain anywhere you can get a clamp to hold.
Step 3 joining the split.