Walking around the Domino, there are a number of features that control all aspects of the positioning of the mortises.

Festool Domino
The front support platform can both tilt through 90 degrees and be set to a specific height. There are preset locators for the primary mitre angles, and the ability to set any other angle between.

The Front End
At the front end, you can see where the mortising bit protrudes from, and there are the stop pins on either side for rapid positioning from the edges of the board. The three arrows cut in front platform are in line with the centre of the mortise, and the reference edge of the stops. The far left and right edges of the lower section align with the centre of the mortise.

Manually Aligning a Mortise
In addition to the stops, there is also a magnifying scale in the centre you can use to manually align up with a pencil mark drawn on the work. By abutting the two pieces to be joined together and drawing a line across the gap, the domino mortises can be easily aligned. There are also lines engraved on the base (not photographed) to also aid alignment, particularly for vertical plunging.

Height Setting
There are also two methods for setting the height of the mortise. The first is the lower scale, where you set the material thickness so the mortise becomes placed in the middle of the material. The second scale sets the absolute height of the mortise cut.

Depth of Cut
The depth of the mortise can be set to one of 5 settings. You can use combinations thereof to either centralise the tenon across the joint, or offset it as material thicknesses dictate.

Changing Cutters
With the cutter-change spanner, a release lever can be lifted so the entire front mechanism of the Domino can be removed, providing easy access to the cutter. It also allows access to the control rods, so if a different plunge depth than is provided by the presets, you can add a tube as a surrogate stop, for any other plunge depth that is required. Most of the time this isn’t necessary – the provided plunge depths are sufficient.

Festool Domino Cutaway
The mechanism inside the Domino is quite elaborate, producing the rotation and oscillation of the cutter. With a steady plunge by the operator, the mortise is quickly produced.
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