Object Name
Plane, Dado
R. Juson & Co
Wood --Iron
Catalogue Number

Length 24.2cm x Width 3.0cm x Height 17.1cm
a- Length 24.2cm x Width 3.0cm x Height 8.6cm
b- Length 14.6cm x Width 2.5cm x Height 0.8cm
c- Length 18.0cm x Width 1.9cm x Height 0.3cm
d- Length 17.3cm x Width 2.2cm x Height 0.8cm
e- Length 17.1cm x Width 1.5cm x Height 0.4cm


Dado grooving plane comprised of five parts, a wooden rectangular body with two cutouts through the middle for two sets of wedges and irons and a 90 degree grooving profile on the sole, as well as a metal screw on top of the plane (a), a wooden wedge that tapers to a point at the bottom and has a rounded top (b), an iron with a flat angled blade at the bottom (c), another wooden wedge with the same shape as the first (d), and another iron with a forked blade to match the flat surface of the grooving profile on the body (e). The wedges and the irons fit together inside the two cutouts in the body of the plane and the wedges hold the irons in place as they cut the wood below. Stamped on the toe of the plane is "I BLOWER", and "R. JUSON & Co HAMILTON". Stamped on the heel of the plane is "I BLOWER", "NO. 177", and "5/8". Stamped on the (c) iron is "WARD", and stamped on the (e) iron is "VIII".


Dado planes are used to cut dado grooves, strict rectangular grooves with straight bottoms and shoulders. Dado grooves are worked across the grain. A double spur is installed in front of the cutting iron, and cuts two trenches on either side of the blade. This way, the blade can dig out material with minimal tear-out and exceptionally clean lines. This plane was traditionally used for preliminary work in wood floors or to cut grooves for bookcase shelves. When working across the grain, the artist must first make a reverse stroke to ensure the double spur cuts through the surface of the wood.