Line Types
A thick, continuous line used to show the visible edges and outlines of an object.
Object Line
Ø
Diameter
This piece of PPE is to be worn at all time when in the shop.
Safety Glasses
The difference between the upper limit and lower limit.
Total Tolerance
A rigid measuring tool marked with units and subdivisions.
Steel Rule
A thin, continuous line that extends from a feature to indicate the limits of a dimension.
Extension Line
⌴
Counterbore
Hazardous chemicals or materials should be stored in this.
Safety Cabinet
A tolerance that allows variation in both directions from the nominal dimension.
Bilateral Tolerance
The ability to obtain consistent measurements when measuring the same feature repeatedly under the same conditions.
Repeatability
A thin line made of alternating long and short dashes that identifies the center or axis of a circular or symmetrical feature.
Center Line
4X
Number of Places
If you get chemicals in your eyes you should use this to flush your eyes out.
Eyewash station
The intentional difference between the dimensions of mating parts, often used to provide the desired fit.
Allowance
Measurement used for general-purpose work where extremely fine precision is not required.
Semi-Precision Measurement
A thin, dashed line used to show edges or features that cannot be seen from the current view.
Hidden Line
↧
Depth
If a piece of equipment is not functioning properly and may be a hazard in the shop, you should follow this procedure.
Lock Out Tag Out
A tolerance that allows variation in only one direction from the nominal dimension.
Unilateral Tolerance
A tool used to check perpendicularity between surfaces and can also be adjusted for layout purposes
Adjustable Square
A thin line with arrowheads at both ends that shows the distance, size, or angle being measured.
Dimension Line
⌵
Countersink
The Class A fire extinguisher is best suited for this type of fire
A fire with ash. Wood or paper fire
The intended or stated size of a feature on a drawing.
Nominal Dimension
A tool used to measure angles and has two sets of one degree graduations to allow measurement from either side
Protractor