Question

82.6 642 6.40 - 57 5.4 R0.8 MAX 28.6 035 28.4 #51 3 45 ф100 R3 #8.5 M10 X 1.5-6H 45 4X 10.5 NOTE: ALL DIMS IN mm ーAX 90. GRAY IRON FIN. DIMS i02 UNFİN, DIMS 최 ANGLE ±0° 30' FLANGED HUB 31A059 2 Refer to drawing 31A059 to answer the following questions. the units of measurement in (a) inches, (b) millimeters, or (c) centimeters? 2. Is the section view a (a) half-section or a (b) full section? what tolerance spplis to the lange diameter 3. What 4 What is the MIMC of the bore diameter? 5. Write the flange diameter in limit form. . Write the bore diameter with an equal bilateral tolerance. 7. Convert the flange diameter to its decimal inch equivalent. (See7 3. 4. 5. 6. page 259.) What is the diameter of the bolt circle? 9. What is the diameter of the spotface? 10. Does the spotface run tangent with the diameter of the flange 8. 10. (calculate)? 11. What is the major diameter of the threads? (See page 260.) 12. What is the pitch of the threads? 13. What is the tolerance class of the threads? 14. Are the threads coarse or fine? (Consult the table on page 261.) 15. How many full threads will the tapped hole contain? INSTRUCTIONS: Calculate the dimensions for the following letters. 12. 13. 14. 15 ① MIN: MAX: Optional Math Exercises: 1. Using only the dimensions given, calculate the X&Y coordinates of the four Ø10.5mm holes. (See page 383.) 2. Using the dimensions given, calculate the MOP (Measurement Over Pins) of adjacent 010.5 holes. (See page 386.) Unit 11 UNIT METRIC DRAWINGS ors and more companies are producing metric drawings today More may be recognized by a block enclosing the word M letters, or a note stating When a new part is uswis are i that all dimensions are in millimeters. made to the desi millimeters or half-millimeters, except where standa involved (drills, reamers, counterbores, etc.). Unlike whole system of dimensioning, metric dimensions do not show in- sicnificant zeros to the right of the decimal. Thus, a whole millime- r would not even include a decimal point and a half-millimeter would include only one digit to the right of the decimal (for example: 15), Also, a dimension of less than 1 millimeter will always in- clude a zero to the left of the decimal (for example: 0.5). Metric dimensions may be converted to inches by multiplying millimeters by .03937, but it is preferred to have the machinist using metric measuring instruments. Some met ude the inch equivalents of all dimensions in a think me ric drawings incl chart on the left side of a drawing. Other metric drawings are dual-dimensioned, with the inch equivalent adjacent to each metric dimension. Metric drawings were the first to have symbols precede the di mension figures (see examples on page 260), while inch-dimensioned drawings continued to have the symbol follow the the trend today is for both systems to uniformly place the symbol in front fi However, DIMENSIONING SYMBOLS A major move toward international standardization of drawin has been to adopt symbols in place of words and abbreviations the next page are dimensioning symbols that you must be able to recognize for the correct interpretation of the most recently drawn blueprints. 259 EXAMPLE SYMBOL INTERPRETATION DIAMETER RAD I US S025 SR12.5 S SPHERICAL DIAMETER SPHERICAL RADIUS REFERENCE DIMENSO DIMENSION NOT-TO-SCALE NO. OF TIMES PLACES ARC LENGTH ) 50 sQUARE (shape) VDEPTH/DEEP V25 COUNTERBORESPOTFACE COUNTERSINK 0.2:1 CONICAL TAPER SLOPE DIMENSION ORIGIN (Reprinted from ASME Y14.5-2009, by permission of the American Socilety of Mechanical Engineers. All rights reserved,) METRIC THREADS Metric threads are specified on engineering drawings in a system similar to Unified threads. That is, the major thread diameter is listed first (after the prefix M, for ISO metric), then the pitch, followed by the tolerance class designation. Whereas the inch system speci- fies the threads per inch, requiring the pitch dimension to be calcu metric system specifies the pitch dimension (for example M10 x 1.5). Only two series of threads are standard in the metric system: coarse, the most common, falls between our Unified coarse and Unified fine series, and fine, which falls between our Unified fine and Unified extra-fine series. When the pitch does not appear in that the thread series is the thread specifications, it may be assu See the table on page 261 for standard sizes and tap drills. Tolerance Class coarse. The fine series is not available for threads smaller than 8 mm. Numbers and letters following the pitch in a thread specification designate the tolerance for the pitch and major diameters of exter- nal threads and the pitch and minor diameters of internal threads, The numbers indicate the amount of tolerance smaller the number, the smaller the tolerance. The letters indicate permissible; the the position of the thread tolerance in relation to its basic diameter Lowercase letters are used for external threads, with e ind large allowance, g a small allowance, and h no allowance case letters are used for internal threads, with G indicati PPer allowance and H indicating no allowance. For general-pu Up a small 260 Unit 11 applications, tolerance classes 6H/6g are usually assigned. They are rabl to the US. 2A/2B classes of fit, and may be assumed C from the specifications. A class 41H51H/4höh is approxi- mately equal to the U.S. class 3A/3B. 14 x 1.5-6 METRIC TOLERANCE MAJOR DIA PITCH METRIC THREAD TABLE Closest Inch Standard Dril Sze rch Equivalent sze Inch Equivalent M1.6 × 0.35 M1.8 × 0.35 0492 0571 1,45 1,60 1.75 2.05 2.50 M2 x 0.4 M2.5 × 0.45 M3 x 0.5 #46 0810 1130 1285 1470 1860 1960 1142 1299 M3.5 x 0.6 #33 M45 × 0.75 M5 x 08 M6 x 1 3.30 3.70 4.20 1654 1968 15/64 17/64 2656 2638 2756 6.70 7.00 8.50 8.70 10.20 10.80 M8 x 1.25 M10 x 1.5 M10 × 1.25 M12 x 1.75 M12 x 1.25 11/32 4219 15/32 4688 12.00 M14 x 2 M14 x 1.5 M16 × 2 M16 x 1.5 M18 x 2.5 M18× 1.5 4921 5512 5709 35/64 14.00 14.50 15.50 16.50 6875 M20 x 2.5 M20 x 1.5 M22 x 2.5 M22 x 1.5 17.50 18.50 19.50 7656 7677 8071 8268 8661 49/64 53/64 15/16 8281 M24 x 3 U24 × 2 M27 x 3 M27 x 2 21.00 22.00 Unit 11 261

Answer 1

mmL 25.5 mm 0 5 D. S M 40 6 H Fine Thread Ivo 82-6 (57-7-3 9-2 2