How to Join a Picture Frame

Joining a picture frame typically involves connecting the four mitered corners securely and seamlessly to create the final rectangular or square shape.

One effective way to join a picture frame is by using adhesive along with specialized clamping tools and reinforcement. A common method involves applying glue to the mitered ends of each frame piece and then holding them together firmly while the glue dries.

Using Clamps for Picture Frame Assembly

Tools like Web or Strap Clamps are particularly useful for this task. These devices excel at holding an entire frame together simultaneously.

• Mechanism: Web or Strap Clamps operate on a principle similar to a ratchet tie-down strap. A strong strap or web runs around the perimeter of the assembled frame, and a ratchet mechanism is used to apply even pressure to all four corners at once.
• Process:
  1. Apply wood glue evenly to the mitered (angled) surfaces of the frame corners.
  2. Assemble the frame pieces, fitting the glued miter joints together.
  3. Wrap the Web or Strap Clamp around the outside of the assembled frame.
  4. Tighten the clamp using the ratchet mechanism, applying gentle and even pressure to ensure the corners are tightly joined and aligned.
  5. Let the glue set completely while the frame is held under pressure by the clamp.
  6. Once the glue is dry and cured, the frame can be further reinforced by inserting small nails or brads through the joint, as mentioned in the reference.
  7. Remove the clamp.

This method, utilizing tools like Web or Strap Clamps, makes it quick and easy to change sizes between different frames due to the adjustable nature of the strap.

Other Common Frame Joining Methods

While gluing and clamping are fundamental, frame corners are often reinforced using various techniques depending on the frame's size, material, and intended use.

Here are some common methods for joining and reinforcing picture frame corners:

• Glue Only: Suitable for very small or lightweight frames where minimal stress is applied.
• Glue and V-Nails: V-nails are small, wedge-shaped metal fasteners inserted into the back of the joint using a specialized tool called an underpinner (or V-nailer). This creates a very strong mechanical lock.
• Glue and Brads/Nails: As described in the reference, small brads or finish nails can be driven through the corner joint, typically from the side or back, after the glue has dried.
• Glue and Biscuits/Dowels: Small wooden biscuits or dowels are inserted into corresponding slots or holes cut into the mitered faces before gluing. This provides excellent alignment and reinforcement.
• Corner Keys/Splines: Small wooden pieces (keys or splines) are glued into slots cut across the mitered joint after assembly. This adds significant strength and can also be a decorative feature.

The choice of method depends on factors like required strength, visible finish preference, and available tools. However, securing the corner while the glue cures, often with a clamp like the Web or Strap Clamp, is a crucial step in most techniques.