DIY Circular Saw Track Guide
Step-by-step guide made from Indy Farm Life's YouTube video.
Build a simple and inexpensive track saw guide for your circular saw. This jig, made from a single sheet of plywood, allows you to make long, perfectly straight cuts in sheet goods.
- Difficulty: intermediate
- Finished size: 8 ft long
Safety
- Always unplug the circular saw before making adjustments or leaving it unattended.
- Ensure the workpiece is securely supported on sawhorses to prevent it from falling or pinching the blade during a cut.
Must know before you build
- Use a factory plywood edge for the guide rail's first cut; it ensures initial straightness.
- For a reversible guide, use a table saw to straighten both edges of the guide rail before assembly.
- Always use both wood glue and screws for the guide rail bond; it prevents future flex.
- The jig's first circular saw cut establishes its zero-clearance edge; this defines your cut line.
- Use 3/4-inch plywood for the base and rail for rigidity. If your circular saw lacks the depth to cut through your workpiece when resting on the jig, you can use 1/2-inch plywood for the base or rail to gain more cutting depth.
Tools
- Circular Saw (Corded circular saw, Ryobi)
- Drill/Driver (Cordless drill/driver, DeWalt)
- T-Square
- Tape Measure
- Carpenter's Pencil
- Table Saw (Benchtop table saw, Ryobi) (optional)
- Clamps (Bar clamps, Irwin Quick-Grip)
Materials
- Plywood (1, Scrap plywood, 3/4 inch, 4x8 ft sheet)
- Wood Screws (Construction screws, #8 x 1-1/4 inch)
- Wood Glue (Small bottle, Titebond)
Step by step
Step 1: Cut the Guide Rail and Base
Use the factory edge of a plywood sheet as a reference to mark and cut a narrow strip for the guide rail and a wider strip for the base.
- Establish a Straight Edge. Identify the factory edge of your plywood sheet. This will serve as the perfectly straight reference for your guide rail. If you don't have a clean factory edge, create one by running a scrap piece through a table saw.
- Mark the Rail Cut. Measure and mark a 4-inch wide strip along the factory edge of the plywood. This will become the guide rail.
- Tip: Mark the 'good' factory edge with arrows so you don't get it confused with your freehand cut.
- Cut the Rail and Base. Make a freehand cut with your circular saw along the marked line to separate the guide rail from the rest of the plywood sheet, which will become the base.
Step 2: Assemble the Jig
Determine the placement of the rail on the base, apply wood glue, and screw it securely in place. Optionally, true up the second edge of the rail on a table saw for a reversible jig.
- Determine Rail Placement. Place your circular saw on the base piece. Position the guide rail next to it, ensuring the base extends past the saw's motor and blade on both sides. The factory edge of the rail should face outwards, away from the saw.
- Check Saw Depth and Clearance. Before attaching the rail, check that your saw's blade can cut through your intended workpiece material when resting on the jig. The combined thickness of the jig's base and rail will reduce your saw's maximum cutting depth.
- Tip: If your saw doesn't have enough depth to cut through your material when resting on the jig, you can use 1/2-inch plywood for the base or the rail to gain more cutting depth.
- Watch out: Ensure the combined thickness of your jig's base and rail doesn't exceed your circular saw's maximum cutting depth for the materials you plan to cut.
- Glue and Screw the Rail. Mark the rail's position on the base. Apply a bead of wood glue, then align the rail (with the factory edge facing out) and fasten it with wood screws.
- Square the Second Edge (Optional). If you have a table saw, run the freehand-cut edge of the rail through it to create a second straight edge. This allows you to use the finished jig from both sides.
Step 3: Create the Zero-Clearance Edges
Run the circular saw along both sides of the attached rail to trim the base, creating two perfect zero-clearance guide edges that match the saw blade.
- Trim the First Edge. Place the jig on sawhorses. Run your circular saw with its base plate held firmly against the guide rail to trim the excess plywood from one side of the base.
- Tip: Place scrap wood under your jig to avoid cutting into your sawhorses.
- Trim the Second Edge. Run the saw along the other side of the guide rail to trim the second edge of the base. This creates a second zero-clearance edge.