The Starrett Book for Machinists' Apprentices

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L. S. Starrett Company, 1917 - 184 σελίδες
 

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Σελίδα 144 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Σελίδα 149 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Σελίδα 31 - Tolerance is provided for holes, which ordinary standard reamers can produce, in two grades. Classes A and B, the selection of which is a question for the user's decision and dependent upon the quality of the work required ; some prefer to use Class A as working limits and Class B as inspection limits.
Σελίδα 22 - ... bar. To read the tool, note how many inches, tenths (or .100) and fortieths (or .025) the 0 mark on the vernier is from the 0 mark on the bar; then note the number of divisions on the vernier from 0 to a line which exactly coincides with a line on the bar.
Σελίδα 167 - The above assumes that the lathe is geared 1:1; that is, the lathe screw constant is equal to the number of threads per inch on the lead screw. If the lathe is not so geared, the lathe screw constant should be used in place of the threads per inch on the lead screw. The foregoing example shows how the figuring can be done when the gears are on the spindle stud and lead screw; but the problem is usually one of finding out what gears to use.
Σελίδα 152 - The resultant is located between the forces at a point that divides the line joining the points of application inversely as the magnitudes.
Σελίδα 52 - J* inch and smaller, and from .007 to .015 for larger is about all that should be required. This feed is based on a peripheral speed of a drill equal to : 30 feet per minute for steel ; 35 feet per minute for iron ; 60 feet per minute for brass. It may also be found advisable to vary the speed somewhat according as the material to be drilled is more or less refractory. We believe that these speeds should not be exceeded under ordinary circumstances. Table of Cutting Speeds Ft. per Minute 15' 2025'...
Σελίδα 52 - Ji inch and smaller, and from .007 to .015 for larger is about all that should be required. This feed is based on a peripheral speed of a drill equal to : 30 feet per minute for steel ; 35 feet per minute for iron ; 60 feet per minute for brass. It may also be found advisable to vary the speed somewhat according as the material to be drilled is more or less refractory. We believe that these speeds should not be exceeded under ordinary circumstances. Table of Cutting Speeds Ft. per Minute 15' 20'...
Σελίδα 140 - For the purpose of measuring angles, the circumference is divided into 360 equal parts, called degrees; each degree into 60 equal parts, called minutes; each minute into 60 equal parts, called seconds.
Σελίδα 43 - ... of different grades. Turkish emery is a hard black and brown stone found in Turkey and brought to this country for use in machine shops. Its quality, for hardness and durability in mechanical work, has never been excelled in any stone yet found. The cloth made is of various grades of coarseness. " The numbers representing the grades of emery run from 8 to 120, and the degree of smoothness of surface they leave may be compared to that left by files as follows : .8 and 10 represent the cut of a...

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