DIMENSIONING REVIEW OR

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Presentation transcript:

DIMENSIONING REVIEW OR YOU SHOULD HAVE LEARNED THIS STUFF IN Drafting 1 I KNOW, THAT WAS SOOOO LONG AGO

How to dimension round things Arcs use radius Radius symbol must precede measurement HOLE DEPTH THRU NEEDS NO NOTE BLIND HOLE MUST HAVE DEPTH SPECIFIED DEPTH SYMBOL MUST PRECEDE MEASUREMENT Circles (holes and cylinders) use diameter Diameter symbol must precede measurement Holes in round view Cylinders in rectangular view

Unidirectional vs aligned Mechanical = unidirectional Read everything from the bottom of the page!! Architecture = aligned Dimensions are parallel to the line they measure We are not drawing houses!! We do not use aligned dimensions!!!

Inches vs metric Inches Metric No leading zeros No inch marks At least 2 places after decimal Trailing zeros to fill two places or the required precision Metric Leading zero if less than 1 No mm required No trailing zeros MILLIMETERS UP TO 30000 THEN MEASURE WITH CENTIMETERS INCHES METRIC .50 0.5 1.00 1 1.75 1.75 2.20 2.2

WHY DOES THIS OBJECT HAVE ONLY ONE VIEW? ARE THESE THROUGH HOLES OR BLIND HOLES? WHAT DOES THE 2 X MEAN? WHERE SHOULD YOU GIVE MATERIAL THICKNESS?

WHAT DOES THIS SYMBOL MEAN? WHAT INFORMATION IS NEEDED TO FULLY DESCRIBE A HOLE? WHY ARE THERE MISSING DIMENSIONS? IS IT OK THESE DIMENSIONS ARE MISSING?

HOW CAN A HOLE AND THE CYLINDER IT IS IN BE THE SAME SIZE? ALWAYS CHECK YOUR MATH!! DO THE DIMENSIONS ADD UP? WHAT TYPE OF SECTION IS THIS?

HOW CAN WE FIGURE THE DIAMETER OF THE CENTER LINE CIRCLE? WHY ARE SOME ROUND OBJECTS DIMENSIONED IN THEIR ROUND VIEW AND SOME IN THEIR RECTANGULAR? SHOULD THE DIMENSION BEHIND THE 2 X BE DIAMETER OR RADIUS?

MOVING FORWARD YOU NEED TO KNOW HOW TO DIMENSION FIRST GO BACK AND ADD DIMENSIONS TO YOUR EXTRUDES, PRINT THEM AND TURN THEM IN YOU WILL BE ADDING DIMENSIONS TO ALL YOUR DRAWINGS WHEN COMPLETING DRAWINGS OUT OF THE TEXTBOOK MAKE SURE YOU USE ALL THE DIMENSIONS IN THE TEXTBOOK. NO MORE, NO LESS!! WHEN DRAWING A PART YOU MEASURED, THINK!!! WHAT DIMENSIONS ARE NEEDED TO FULLY DESCRIBE THE OBJECT. TOO MANY DIMENSIONS ARE ALMOST AS BAD AS NOT ENOUGH.