The Starrett Book for Machinists' Apprentices |
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Common terms and phrases
abrasive abrasive wheel accuracy accurate adjust altitude angle ATHOL MASS axis belt bevel blade bolt Brass cast iron chipping chisel chuck clamped clearance cone-point contact measurements contact points cutter cutting edges cutting lips cutting speed cutting tool cylinder degree diameter dimensions distance divided drawing drilled hole driver engine lathe equal example Feet Feet Feet flat flutes forced fits forged gages graduated grinding grinding machine HACK SAW hammer hand frames hardened High Limit L.S.STARRETT lathe centers lathe tools laying lead screw length located Low Limit Tolerance machinist metal micrometer Milling cutters milling machines multiplied number of teeth number of threads ordinary plane protractor pulley quantity radius reamers reaming revolutions per minute Revs scale screw thread shaft shank sides Slant height sleeve spindle spring caliper square standard STARRETT steel rule straight stud surface Table taper termed thimble thousandths tool steel usually Vernier wheels
Popular passages
Page 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.
Page 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.
Page 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.
Page 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.
Page 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.
Page 152 - The resultant is located between the forces at a point that divides the line joining the points of application inversely as the magnitudes.
Page 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'...
Page 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'...
Page 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.
Page 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...