Dimensioning is the use of numerical values and units of measurement to define the size, shape, and other characteristics of objects depicted in technical drawings. There are two main types of dimensions: size dimensions specify overall and detailed measurements, while location dimensions position parts or features. Proper dimensioning is important for unambiguous communication in technical drawings and to ensure manufactured parts meet design specifications. Dimensioning rules establish guidelines for placement, formatting, and other conventions to make dimensions clear and consistent.

1. DIMENSIONING
PRESENTED BY: MS. LYKA NOCIDO
BTTE IV-L/ DRAFTING MAJOR

2. WHAT IS DIMENSION?
•DIMENSION IS NUMERICAL VALUE EXPRESSED IN
APPROPRIATE UNIT OF MEASURE AND INDICATE
ON A DRAWING.
•DIMENSIONS AND NOTES DEFINE SIZE,
LOCATION, AND OTHER REQUIREMENTS TO
FULLY DEFINE WHAT YOU WANT
MANUFACTURED.

3. KINDS OF
DIMENSION

4. SIZE DIMENSIONS
LOCATION DIMENSIONS
•GIVE THE DETAILS AND OVERALL
SIZES OF THE OBJECTS.
•MERELY LOCATE PART OR PARTS OF
THE OBJECTS.

5. E
X
A
M
P
L
E

6. TWO SYSTEM
OF LINEAR
MEASUREMENT

7. METRIC ENGLISH
•M E T E R
•K I L O M E T E R S
•C E N T I M E T E R S
•K I L O G R A M S
•L I T E R S
•G R A M S
•I N C H E S
•P O U N D S
•O U N C E S
•M I L E S
•G A L L O N S
•F E E T

8. METRIC ENGLISH

9. DIMENSION
RULES

10. 1. DIMENSIONS SHOULD
BE PLACED BETWEEN
VIEWS.
2. AVOID REPETITON OF
DIMENSIONS.

11. 3. DIMENSION LINES BE
PARALLEL TO THE EDGE OR
LINE BEING MEASURED.
4. THE FLARE OF THE
ARROWHEAD SHOULD BE
PROPERLY MADE.

12. 5. THE FINE LINE IN A
DIMENSION LINE MUST BE
STRICTLY OBSERVED.
6. THE FIGURES OR NUMBERS IN
DIMENSION LINE SHOULD BE
LEGIBLE AND PROPERLY LOCATED.

13. 7. DIMENSIOAL FIGURES ARE
PREFERABLY DIRECTIONAL.
8. USE AN OUTSIDE DIMENSION IF
THE SPACE IS LIMITED, AND USE AN
INSIDE DIMENSION OF AMPLE OR
WIDE.

14. 8. ONLY METRIC
MEASUREMENTS SHOULD
APPEAR IN DRAWINGs.
9. CONTINUOUS DIMENSIONS
SHOULD BE USED WHENEVER
POSSIBLE.

15. 10. STAGGERED DIMENSIONING
SHOULD BE USED WHEN THE
SPACES FOR THE DIMENSIONS ARE
NARROW.
11. A DIMENSION LINE MAY BE
TERMINATED BY A PROJECTION,
VISIBLE, HIDDEN, OR CENTER LINE.

16. 12. DIMENSION LINES SHOULD
NOT BE BEYOND THE EDGE OR
LINE BEING MEASURED.
13. ARROWHEAD SHOULD POINT TO
THE TERMINATING LINE AND NOT
TO THE DIMENSIONAL FIGURE.

17. 14. LET NO WORKMAN
ADD OR SUBTRACT
DIMENSIONS.
15. PLACE THE DIMENSIONAL
CLOSEST TO THE PART BEING
MEASURED.

18. 16. WHEN GIVING THE
LOCATIONAL DIMENSIONS FOR
ROUND HOLES, MEASURE THE
CENTER-TO-CENTER DISTANCE
BETWEEN HOLES AND FROM THE
CENTER LINE OF THE HOLES TO
THE NEAREST VISIBLE LINES.

19. 17. NEVER CROWD
DIMENSIONS.
18. PROJECTION OR EXTENSION
LINES SHOULD BE PROPERLY
DRAWN.