The length of molds is calculated on a basis of 166⅔ to an em pica, while the body or thickness of slug is calculated according to the above table.
The slug should be the same thickness at points 1, 2, 3 and 4 (Fig. 40). If the machine locks up properly, and the back knife is set right, the slug should measure 918 to 919 thousandths high from bottom of slug to top of letter.
Fig. 39.
Matrix Hair Spaces.
These are furnished as sorts. They are similar in shape to the em and en spaces, but are inserted in the line by hand and automatically returned by the machine to the quad box. They are of the following thicknesses, respectively: .012, .013, .014, .015, .016, .017, .018, .019 and .020 of an inch. Regular thin spaces measure .028, .031, .035 and .0385.
Adjustment of Mold Slide and Disk.
Adjustment of the mold slide is done by means of two set screws, which adjusts the gib on which it slides. This gib should be adjusted so that the slide has .007 play. This will allow it to work freely.
The mold disk is held in position for casting and trimming the slug by means of pins attached to the vise, called mold disk locking studs. The studs are located in relation to the mold disk locking bushings at the factory so as to give perfect alignment of the matrices. They are dowelled in place and should never be changed.