LINKAGE: The three most common linkages for a drafting machine are the
pin joint, the steel band, and the roller. Because of the ability to adjust
tension in the bands, steel band linkage is superior to pin joint linkage.
Drafting machines with a roller linkage are advantageous when you are
working on a large table or in a small space.
Figure 2-13 displays linkages most commonly found on drafting machines.
Figure 2-13. Linkage types.
TABLE CLAMP: The table clamp attaches the drafting machine to the table.
Adjustments to the clearance and the position of the protractor head are made
at the clamp.
Continued on next page