Festool Domino DF 500 Review

The Domino cuts an oval mortise by plunging a spinning, oscillating bit sideways as well as down, then swivelling it to widen the slot to one of three preset widths. A domino tenon — a small, ribbed birch or beech spline — glues into the matching mortises on both workpieces. The result behaves like a mortise-and-tenon joint for strength, cut in the time a biscuit joiner takes.

Power is 420W at 25,500rpm, routing depth goes to 28mm, and the tool weighs 3.6kg. Cutter sizes run from 4mm to 10mm, and preset depth stops (12, 15, 20, 25, 28mm) cover the great majority of furniture-scale joinery without a separate depth-gauge step. The current DF 500 Q-Set ships with the cutter, support bracket, Trim Stop, Cross Stop, spanner, Plug-It cord and a Systainer3 case.

Two accessories do most of the work of justifying the price. The Trim Stop turns the fence into a perpendicular reference for end-grain mortising — table legs into aprons, for instance — without a shop-built jig. The Cross Stop indexes off a mortise you have already cut, so a row of evenly-spaced shelf-pin-style mortises across a panel edge does not need separate measuring for each one.

Set-up accuracy matters more than it does with a biscuit joiner, because the joint is tighter. The fence’s height scale and the viewing-window centering scale are both worth checking against an actual test cut before committing good stock — a scale that reads a millimetre off is invisible until the joint does not close flush.

The honest case against it is price. It is not a small purchase, and the tenons and cutters are ongoing costs rather than one-off. For someone building the occasional frame or box, a doweling jig or biscuit joiner does the same structural job for a fraction of the outlay. Where the Domino wins is time and repeatability at volume — cutting forty-plus joints for a piece of furniture is a different task with this tool than with anything else on the market.