HOW to create an assembly drawing. ? HOW to create a standard parts shell Key Points. ? Assembly drawings show how individual parts fit together to make a machine. A standard parts sheet contains purchased items. Copyright CHECK by K. Planters Restricted use only 12, 1) Definitions Assembly Drawing What is an assembly drawing and why do we need them? An assembly drawing is a drawing of an entire machine or system with all of its components located and identified. We need to know how to put the machine together. Parts List (Bill Of Materials) Part#s Subassembly Drawing
Subassembly: Two or more parts that form a portion of an assembly. Can you think of some examples of subassembly? A car differential A motorbike engine ? A compressor in an AC Definitions Does an assembly drawing normally show size? No. Its job is to locate parts. How do we show the size of an individual part? A detail drawing is a drawing of an individual part, which includes an orthographic projection and dimensions Copyright 02007 by K. Planters Restricted use only Working Drawing Package Working Drawing Package: A packet Of drawings that gives the specifications accessory to manufacture a design.Order now
A typical working drawing package A standard part sheet includes; contains information about ? an assembly drawing, purchased items and will not ? detailed drawings, be discussed in this course. ? and a standard parts sheet. Copyright 02007 by K. Planters Drawing Order Drawings included in a working drawing package should be presented in the following order, ? ? ? ? ? Assembly drawing (first sheet) Part Number 1 Part Number 2 Standard parts sheet (last sheet) Copyright @2007 by K. Planters Restricted use only 12. 2) Views Used in Assembly Drawings Selecting View. Does an assembly drawing need a FRONT, TOP and RIGHT SIDE view? Sometimes We need as many views as it takes to identify and locate each part. ?It may only take one view. Needed 3 views to locate all Of the parts. Needed only 1 view to locate all of the parts. Sectional Views Sectional views are used quite often when drawing assemblies, Why? Assemblies often have parts fitting into or overlapping other parts and we need to look inside the assembly to see clearly. Section Hatch in Assemblies Section Hatch: Section hatch in adjacent parts are drawn in opposing directions. ? In the largest area, section hatch are drawn at AS’ ? Next largest 135′ 450) Additional areas = 300 and 600 Smaller areas = The distance between the section hatch may also be varied to further distinguish between parts. Copyright 02007 by K. Planters Restricted use only Exercise 12-1 Section hatch in assemblies Draw the section hatch for the assembly shown. Copyright 02007 by K. Planters Restricted use only Fill in the section hatch is the largest area. Fill in the section hatch is the 2nd largest area.
Fill in the section hatch is the next largest area. _so Pill in the section hatch is the last area. 300, smaller spacing 12. 3) Things to Include/ Not Include Things to Include / Not Include When deciding what to include in an assembly drawing remember; ? The purpose of an assembly drawing is to show how the individual parts fit together. ? It is not used as a manufacturing print. The assembly drawing should not look overly cluttered. ? Some lines that are necessary in a detailed drawing may be left off the assembly drawing to enhance clearness.
Hidden Lines DO we include hidden lines? Usually ? They should be used wherever necessary for clearness. ? They should be left off when they impair clearness. ? When a section view is used, hidden lines should not be used in that view. Dimensions Do we include dimensions? Usually not ? a rule, dimensions are not given on assembly drawings, ? If dimensions are given, they are limited to some titillation tooth object as a whole. Identification Ballooning: A part is located and identified, in an assembly drawing. Y using a circle containing the part number and a leader line that points to the corresponding part. Leader lines point to the corresponding part. Balloons containing part numbers. Balloons are placed in orderly horizontal or vertical rows. The leader lines; . Should not cross, . Be as parallel as possible. Parts List / Bill of Material The parts list is an itemized list of the parts that make up the assembled machine. Parts lists contain the part number, part name, the number required and the material of the part.
Parts lists contain the Other information can be included, such as, stock sizes of materials and weights Of the parts. Parts are listed in order of their part#. Part#s are usually assigned based on the size or importance of the part. The parts list may be placed in the upper right corner of the drawing. – Part# 1 is at the top, The parts list may be placed in the lower right corner of the drawing. – Part* I is at the bottom. 12. 4) Standard Parts Standard Parts Standard parts include any part that can be bought off the shelf.