How are threads represented in drawings?
What will be an ideal response?
Drawing a thread exactly as it looks is unnecessary. Engineers have developed two systems for representing screw threads. The classic schematic representation shows the threads as a series of lines that are perpendicular to the thread axis. The crest of the thread is shown as a line across the full diameter of the shaft or hole and the root as a slightly shorter line that does not reach the full diameter. The simplified system of representing threads is quicker and in greater use today. This representation shows the major diameter of the shaft or hole and the threads as a dashed, or hidden, line parallel to the thread axis.
To illustrate a blind hole, the drafter illustrates the pilot hole and the threaded portion. The hidden lines representing the major and minor thread diameters are spaced far enough apart to be clearly separate. The spacing is important because on threads, the difference between the major and minor diameters is often very small; and if drawn to actual size, the lines would run together. The hidden line dashes are usually drawn staggered for clarity.
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A. ?carbonaceous materials B. ?polymer fibers C. ?inorganic fibers D. ?fibrous glass
Reforestation and _____ have helped reduce erosion in forest areas
a. seedlings b. clear-cutting c. wind erosion d. cover crops
Determine the amount of brick, mortar, accessories, and any other related items required the Real Estate Office in Appendix E. Using the labor rates from Problem 7-31 and the crew rate for the masonry crew from Problem 7-32 determine the cost of the masonry.
What will be an ideal response?
Where is an accumulator normally installed?
a. Suction line b. Liquid line c. Discharge line d. Condensate line