Festool 483922 Trammel Unit OF 1010 is a router trammel accessory made for the Festool OF 1010 router. This is a trammel unit designed for routing precise circles and decorative curves in sheet goods and edge work. Model Number: 483922. If you need accurate round cutouts, curved profiles, or repeatable radii without building a shop-made jig, this is the purpose-built way to get there.

The big value here is control. Festool rates this trammel unit for circle diameters from 6 inches to 30 inches, or 153 mm to 760 mm. That covers a useful range for speaker openings, tabletop details, curved panels, template work, and decorative routing where being even a little off shows up fast. Instead of freehanding an arc and hoping the bit tracks cleanly, you get a fixed center point and a guided radius.

The setup is straightforward. The trammel unit anchors at the center using the included trammel point, then attaches to the OF 1010 with thumbscrews. That matters because accessories like this only earn their keep if they go on quickly and stay put. A secure mount helps the router move smoothly around the pivot, which is what keeps the cut consistent from start to finish.

Festool also calls out the ability to start and end cuts anywhere in the material. On the bench, that gives you more flexibility than edge-only routing. You can cut interior circles, rout partial arcs, or create decorative curves on surfaces without being locked into one entry point. For cabinet parts, furniture work, and custom details, that flexibility saves setup time and reduces the need for one-off jigs.

Because this is an accessory built specifically for the OF 1010 platform, the fit is the whole story. It is not trying to be a universal bar that kind of works on a bunch of routers. It is made for the Festool OF 1010, which is exactly what you want when precision matters. If your shop already runs that router, this expands what the tool can do without changing the handling you are already used to.

For day-to-day shop use, this is the kind of accessory that helps reduce waste and rework. When the radius is fixed and repeatable, you spend less time correcting layout errors, sneaking up on a line, or remaking a panel because the curve drifted. That is the practical payoff: cleaner results, better repeatability, and less material heading for the scrap pile.

Who should buy it? Woodworkers, cabinet installers, finish carpenters, furniture builders, and serious DIY users running a Festool OF 1010 router. If you regularly need accurate circular cuts or curved routing and want a cleaner, faster setup than a homemade jig, this accessory makes sense. If you do not own an OF 1010, it does not, because compatibility is specific.

Why the Festool 483922 Trammel Unit OF 1010 Earns Its Spot

If you already own an OF 1010 and need clean, repeatable circles, this is the right accessory instead of a homemade workaround.

• Who it's for: Woodworkers, cabinet shops, and detail-focused DIY users running a Festool OF 1010 router.
• Why it stands out: It is purpose-built for accurate circle and curve routing, covers a useful 6 inch to 30 inch diameter range, and mounts with a simple thumbscrew setup.
• Worth knowing: This is a specific-fit accessory, not a universal router guide, so it makes the most sense if the OF 1010 is already part of your setup.

• What router is this trammel unit made for? It is designed for the Festool OF 1010 router.
• What size circles can it cut? Festool lists a circle diameter range of 6 inches to 30 inches, or 153 mm to 760 mm.
• What kind of work is it meant for? It is made for cutting radii, full circles, and decorative curves on surfaces and edges.
• How does it attach to the router? It attaches simply and securely using thumbscrews and anchors at the center with the included trammel point.