Maundril

The cutting maundrils taper directly from the centre to the points, the holing maundrils are somewhat stronger and bluffer.

The whole cylinder is then placed in the furnace, and brought to a proper welding heat; it is next passed through a series of grooved rollers, the grooves of which are furnished with a maundril, or an egg form, attached to, and supported on, the end of a fixed bar, firmly secured at the opposite end, to resist the end pressure or strain during the process of rolling. The maundrils are made of cast-iron, chilled, and are socketted on the end of the bar, and secured by a screw-nut, so that they may be easily removed, when required.

The increased facility for dividing and punching the pitch pins on the rollers for engraving by mill and other machines, and in setting out for hand and other engraving, is obtained by an improved method of securing the roller to the maundril. Instead of the usual box maundril made in segments or wedges and coned inside to fit the inside circle of the roller, the roller is fastened on the maundril by a bell chuck or chucks, formed so as to grip the whole outside coated circle of the roller, the chuck being coned inside to receive rollers of different sizes, one of the chucks either forming part of the maundril or not, as required.