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Master plates are made of wear-resistant, dense grey cast iron. The testing faces are of highest accuracy, the bottom sides mostly being equipped with stiffening ribs in order to make the roaster plate rigid and unbendable.
Surface plate
Large plate on which small to medium-size workpieces are checked; the workpiece is moved over the plate.
Figure 8 - Surface plate
Straight edge
Instrument for checking long and narrow workpiece surfaces, the instrument being moved over the workpiece.
Figure 9 - Straight edge
Planing bar
Instrument for checking prismatic guideways. Here, two testing faces have the same angle to which the prismatic guide shall be planed. The instrument is moved in the prismatic guide.
Figure 10 - Planing rod
Planing instrument for slideways
Specially shaped instrument for inking slideways of machines - the sliding faces are shaped corresponding to the machine bed. The instrument is moved over the bedways of the machine.
Figure 11 - Planing device for guides
Ink or inking paste:
Colouring agent for making visible the unevennesses on worked surfaces
Figure 12 - Inking paste
The paste consists of pine black, clay or red-lead and oil - for use in light rooms. With unfavourable light conditions, red ink (powdered iron oxide) is used for preinking and black ink for reinking. With spot scraping, the use of blue ink (iron cyanide compound) is recommended.
Inking block
Block of wood covered by cloth that does not unreval or by leather for distributing the ink.
Figure 13 - Inking block
What is understood by planing a
surface?
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When do you use surface plates and straight edges? Explain the
difference.
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What is the task the ink has to
fulfill?
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