8/16/2019 2015Drawing E

http://slidepdf.com/reader/full/2015drawing-e 1/5

 MM1DM1: Design and Manufacture

Drawing Exercise 4: Assembly Drawing

Drawing is a practical subject and you will learn mainly by performing theexercises. It is expected that you will look carefully at the exercises and attemptthem before you come to the class so that you can identify in advance whereyou will need support in the class.

This exercise is a compulsory, formative exercise and its adequate completionand submission is a prerequisite for the assessment of the CAE exercises.You must have your work marked during the eighth Drawing Class

(26/11/15) even if you have not completed all the sections. Workhanded in late will not be marked without supporting extenuating circumstancesdocumentation. Please ensure your name and DM1 workshop group is printedclearly on every sheet you submit. Marked work will be returned to you at your

next drawing (practical) class.

Do NOT hand in to the Engineering Student Support Office (ESSC). 

Student Name

Student ID No & usernameStudent ID:  Student username: 

Student DM1 Workshop Group No

Date of submission

Planning sketch Marks out of 10

Border, projection symbol and title block Marks out of 11

Answering questions Marks out of 2

Accuracy of 3 elevations Marks out of 50

Quality of drawing Marks out of 6

Parts list and BOM balloons Marks out of 16

Section plane Marks out of 5

Exercise 4 Total Mark Marks out of 100

Marker’s name (please write clearly!) Student marker name:  Student marker ID: 

Additional feedback from the marker will be given on the drawings if necessary.

Dept of Mechanical, Materialsand Manufacturing Engineering

8/16/2019 2015Drawing E

http://slidepdf.com/reader/full/2015drawing-e 2/5

 

Intended Learning Outcomes

Module Learning Outcomes - On successful completion of this module you will beable to:

  Communicate design solutions using CAD models and engineeringdrawings.

  Appreciate the function and working mechanism of machine elements, andselect suitable machine elements in mechanical design.

This exercise is used to develop and assess your ability to communicatetopological (i.e. form or shape) information about an assembly of objects in atwo dimensional form (i.e. on paper). Additionally, it is used to develop andassess your ability to consider how components fit together and how tocommunicate this.

Exercise 4 Marks Scheme 

Planning sketch  10 marks

Views drawn 1, 2, 3, 4, 5   5 marks

BOM balloons and parts list added 6, 7, 8, 9, 10  5 marks

Border, projection symbol and title block  11 marks

Border 1 cm from edge 11 & square corners 12  2 marks

Projection symbol–

 correct orientation 13

 & proportions 14

  2 marksTitle block PRINTED withname 15 , group 16, ID 17 , title 18, date 19, units 20 & scale 21 

7 marks

Questions 2 marks

Function of the machined shoulders on the base 22  1 mark

Material/process used for the idler roller 23  1 mark

Main elevation 22 marks

Base 24  1 mark

Brackets (3 marks per bracket 25, 26 including hatching 27, 28 & web 29, 30) 6 marks

Shaft 31 with flats 32, chamfers 33 & centreline 34  4 marks

Oil feed hole (axial 35  & radial 36, radial centreline 37 ) 3 marks

Idler roller (shape 38 including radii 39 & hatching 40) 3 marks

Bush (1 mark per bush including hatching) 41, 42  2 marks

Grub screw holes (including correct thread representation 43, hatching 44 

& centreline 45 )3 marks

Continued overleaf...

8/16/2019 2015Drawing E

http://slidepdf.com/reader/full/2015drawing-e 3/5

Plan elevation 20 marks

Base (shape 46 & radii 47 ) 2 marks

Brackets (boss 48, 49, web 50, 51, shoulder 52, 53 & radius edge 54, 55 ,4 marks per bracket)

8 marks

Shaft (including flats 56 & centreline 57 ) 2 marks

Idler roller (main section 58 & bosses 59) 2 marks

Bushes 60  1 mark

Grub screw holes (including correct thread representation 61 &crosshair 62)

2 marks

Fixing holes (size 63, position 64 & crosshairs 65 ) 3 marks

End elevation  8 marks

Base 66  1 mark

Bracket (profile 67  & web 68) 2 marks

Shaft (including flat 69 & crosshair 70) 2 marks

Oil feed hole 71  1 mark

Idler roller 72, 73  2 marks

Drawing quality 6 marks

Orthogonal axes 74, 75, 76  3 marks

Appropriately spaced views 77, 78, 79  3 marks

Good features include:Good line quality (not too wide or too thin, not smudged)Clear line ends (not ending as a cross)Construction lines clearly more faint and narrow than outlines

Orthogonal axes used and at the correct anglesCurves neatly drawnCentrelines and crosshairs included and correct

No hidden detail included as the section will suffice

Parts list & BOM balloons  16 marks

Parts list headers (item 80, description 81, material 82, quantity 83) 4 marks

Parts list items (base 84, bracket 85 , shaft 86, idler roller 87 , bush 88) 5 marks

BOM balloons (1 89, 2 90, 3 91, 4 92, 5 93) 5 marks

Position 94 & size 95  of BOM balloons 2 marks

Good features:Appropriately placed, not too close to object, not using hidden or obscured detailLeader lines correct, not crossingBOM balloons correctly sizedText correctly sized, placed and orientedAppropriate number of BOM balloons (no duplicates or omissions)Parts list complete

Continued overleaf...

8/16/2019 2015Drawing E

http://slidepdf.com/reader/full/2015drawing-e 4/5

Section plane 5 marks

Arrows in correct direction 96 & correctly labelled 97   2 mark

View correctly titled & PRINTED 98  1 mark

Chain-line with thickened ends 99  1 mark

Appropriate section plane 100  1 mark

Good features:Appropriately placedChain lines with thickened endsLeader lines correct and arrow heads appropriateText correctly placed and oriented

Hatching weight, spacing, angle and location appropriate

Total100marks

8/16/2019 2015Drawing E

http://slidepdf.com/reader/full/2015drawing-e 5/5

Exercise 4: General Assembly drawing of an idler roller

Component description

In this exercise detail drawings of a base, idler roller, brackets, shaft and bushesare provided. Please use the dimensions provided (n.b. the idler roller drawing

has two sheets–

 the second shows the internal fillet radii). The bushes have arunning fit on the shaft and fit more tightly into either end of the central hole inthe idler roller. Each end of the shaft fits into the brackets which are mountedon the base, fixing holes aligned and grubscrews (not shown) located on theflats.

Task

1. Use an A4 sheet of squared paper and sketch a scale drawing of theassembly, using the information given on the five detail drawings, adding allsection detail as necessary. You should choose your views and partsorientation to fully illustrate the assembly to best effect using sections where

appropriate. Also, plan your parts list and position of your BOM balloons.Bring the completed sketch to the first drawing class related to this drawingexercise.The plan sketch is worth 10% of this drawing exercise. 

2. Use an A3 sheet of plain paper and add a border, projection symbol and titleblock. Put your name, DM1 group, student ID no., date, drawing title,drawing units and drawing scale in the title block.

3. Using your plan sketch and the information given on the five detail drawings,draw (to scale, using a ruler for straight edges and compasses for circles) in

3rd angle projection, three full-size orthographic views of the idler rollerassembly illustrated overleaf. You should choose your views to fully illustratethe assembly to best effect using sections where appropriate. Section planes,where used, should be indicated on the drawing in the standard way, asdescribed in lecture 4.

Add a parts list to your drawing as described in the lectures.

4. There are 2 marks if you note on your on your plan sketch the answers tofollowing questions:

1.  What is the function of the machined shoulders on the base?

2.  What is unusual about the material/process used for the idler roller?