Drafting Guide

7/28/2019 Drafting Guide

1/7

machining of material

free to choose

S u r f a c e F i n i s h ( IS O 1 3 0 2 )

~

machining of material

required

machining of materiai

inadmissible

N:c

1 b

-~

.~

- - - , .

j f ~; ; j ; i ;milled~

1. The basic symbol consists of two lines of unequal lengths (ratio 1:2),. which are inclined to each other at 60. The symbol is to be used

only if explanations are given to clear its meaning.

H, =5 m m ; H2=10 m m ;

t h ic k n es s o f l i n e = 0 ,3 5; h e i gh t o f l e tte r in g =3 ,5 m m

2. The individual specification of the surface finish is to be added to.

the corresponding symbol.

a) Roughness value Ra in JLm or roughness class N 1 - N 12

b) Production method, surface treatment, coating

c) Reference distance in mm

d) Direction of grooves

e) Allowance for machining in mm

3. The specifications are to be written on an extra line of the longer

side. The instruction states the final condition of the surface.

4. Symbols and lettering must be readable from below or from the

right. They may also be joined to the surface by a reference arrow.

Symbol and arrow are to be placed from the outside on the object

edge or on an extension line .

C.: 5. The surface symbol is placed for each area in one elevation only,

i.e. where the corresponding dimension figure appears.

6. When surfaces have the same finish the symbol is placed next to

the workpiece. The word specification allround" may be added.

W (trW )7 .

~.

/

)tmilled 8 .

ij=4~

When identical surfaces prevail the deviating sign only is entered

on the object edge. The main symbol is entered next to the object

. drawn, the exception repeated in brackets next to it.

Turned objects are given one symbol only on the outer line.

Simplified entrjes may be made at the surface if specifications are

complicated or if short of space, their meaning must be e~plained

somewhere else. .

36- . . - - -


2/7

A s s em b ly D ra w in g ; P ar t -A s s em b ly D ra w in g , P ar ts D ra w in g

The assembly drawing shows a device, machine, building etc. in assembled condition.'

The part-assembly drawing shows individual component groups (often only 2 assembled parts).

The part drawing illustrates component parts.

2

3

"

o

o

I Ramiel "II

1 Zan e

r /(Iemmbo/zen

1 G. """,

Sf Be~nnUflg

I(lo'~ Dotum

4

, C"Zn40 .45~35

:) I 51U 3$1


3/7

R ea d in g 01 S im p le P ro d u c t io n D ra w in g s

/

rC>

IrnII

C>

ILf)

5- =:.=

II~

1; :f - - -II ,

C>co

I

I

II~

I

ILI

~:, I

20rMS

M 6

co

1 4

40

"U-Section

Main dimensions:

U .40x20xBO

Malerial:

St 37 . sleel 37 kp/mm'

minimum tensile strengthTools:

Marking tools, measuring tools,

centre punch, drill, countersink,

thread tap, tap wrench,

flat square 90, thread plug gauge,

angle gauge, saw, files

Machining sequence:

1. Remove tinder

2. File base surface

3. File length of sides

4. File sides (90)

5. File top surface (90)

6. File to length

7. Mark, drill, cOuntersink, cut thread

8. Mark and file the dovetail guide

9. Mark and file out the side recess

10. Debur all edges

j

Examine other drawings (e .g. exerc ises)

a c c o r di n g t o t h e a b o v e a s p ec t s .

.''

. - - - '~,

40


4/7

H a l f S e c t i o n -P a r t S e c t i o n /

1. Which dimensioning of a part section is correct? 2. When are part sections used?

,

A~

22 ~22~~~24

B ~24 A To save shading.~+26~C ." 26 B For workpieces which are not supposed to be drawn in section.~

D~

28 '--28C To give a pleasant appearance to the drawing.

~

I D Only by angular objects.

3. Which halt of a workpiece is mainly drawn in section 4, When drawing a half section how is the sectioned half defined

when producing a half section? from the other half?

A there is no special rule A by a freehand line

B the left half B by a center line

'c the upper half C by a thick dash/dot line

o the lower or right half D by a thick unbroken line

5. How are part sections defined? 6. Which rule has been disregarded in this drawing?

A Part sections are defined by thin V/\.If//.. Iunbroken lines. ~

A by thin unbroken lines B Shading of an object must run

B by freehand lines in the same direction.

~

C by thick dash/dot linesC The object must be drawn in full section.

D No rule: the object is drawn correctly.

D by no lines -

7. Which dlmenslonmg IS correct? 8. Which drawing is in halt section?

0 0

-~~$en . . . >D~tm ~t=mg mm r

iT' .A B C D A B C D

9. How many mistakes are in this drawing? 10. Which drawing is correct?

A 3 mistakes~

16

~ ~ & J 6JB 4 mistakes s ?len 20C 5 mistakeso No mistakes .!.!-A B C D .

11. Which dimension of the turned object is entered correctly?12. Which drawing is correct?

A 15 I T T

~~~~

>D

S en SB 20

~

_.- N .-S

C 50

~~

D 60A B C D

13. In which drawing is the cut view drawn correctly? Mark the corresponding squares!

~ !~1 2 3 4 5 6 7 8 9 10 11 12 13 Mistakes

rIA

BMarks

C

0

A B C D

Name Class Date

T 1 2


5/7

S c r e w /B o l t C o n n e c t i o n s /

1. Which drawing is incorrect? 2. Which drawing is correct?

l aww ~ tf J tf;jW

A BC D A B C D

3. Which drawing is correct? 4. The height ofa nut is

W $$WAh=e

B h=0,8. e

C h=0,8. d

D h=0,7. dA B C D

5. Which drawing of a nut is correct? 6. Valid for the height ofa screw head is

,A h=0,7. d

(e\'Wt; @ Bh=d\-.::.J \:.':-1 ~'f~ C h=0.8. dDh='4.e

A B C D .

7. Which drawing is correct? 8. Which detail is drawn incorrectly?

T n - I T r r r-~~.

I 4 u + -It-r/~'{~~ ~

;

r/I I I I I I I I I I I, /~A B C D A B C

9. Which drawing is correct? 10. Which drawing is correct?

~T7;" ~~ ~ r 7 / rmI T P J etJ ~rrm ~~. ~ %I ~: , o I ~ j I ~~~ ~~/;/ / - " Y

A B C DA B C D

11.Which drawing is correct?

E,

c_ l-f- _.- - - r- -1--+

A B C D

12. In which manner should nuts preferrably be drawn? Mark the corresponding squares!

A Corner-to-corner dimension in side elevation1 2 3 4 5 6 7 8 9 10 11 12 Mistakes

B Corner-to-cornerdimension in front elevationA

C Spanner opening in front elevationB

MarksC

D None is preferred0 -----

Name Class Date

T 1 4


6/7

,. What does this symbol mean? 2. Machining of material is free to choose. Which symbol is correct?

Su r f a c e F i n i s h ( ISO 1 3 0 2 ) /

A machining of material free to choose d .B machining of materiai required ~.~. ~ ~ ~C machining of material inadmissible

D machining of material unnecessary

A B C D

3. Which drawing is correct?

DCBA

4. Which drawing refers to a maximum aI/owed surface roughness

Ri.! = 3,2 pm?

oCBA

5. Which specification on surface finish refers to production

method?

6. Which designation is not according to standard? .

A Letter a

B Letter b

C Letter c

D Letter d

b~~

~.

A drilledB honed

C painted

D polished

10. Which drawing is correct if a/l sides have the samesurlace finish?

c

1,6

B

~ allround allround

D~~~

D

A D

A ..1

D

8. Which drawing is according to standard?

c

B

D

C

A

7. Which drawing isnot according to standard?N

m-

9. Which specification is incorrect?

t.I.

DCBA

Mark the corresponding squares!

12. Which drawing of the shaft is according to standard?

1 2 3 4 5 6 7 8 9 10 11 12 13 Mistakes

A

8Marks

C

DD

I! J.l/\JoCgl

CBA

Which symbol is to be placed on the surface?

d JL~.JL

13. Next to the drawing is the following

specification!

A surface with mainly same finish with Ra = 3,2 J ,Lrn

B surface with mainly same finish with Ra = 1,6 J Lrn

C surface with mainly same finish with Ra =0,8 .urn

D Roughness value Ra may be chosen between 0,8 p.m,

1,6 J ,Lrn and 3,2 JL m

1,. Which statement corresponds .to the following specification?

Name

,.

Class Date

T 16


7/7

A s s em b ly D ra w in g , P ar i -A s s em b ly D ra w in g , P ar is D ra w in g

3

4 5

Hexagon in position showing maximum

corner-lo-corner dimension

1 B

Task A: Draw part 6 in given position, I.e. front elevation in half section,

top view and side elevation. Enter dimension lines without dimension figures!

Task B: Draw part 3 (hand wheel) in front elevation (half section) and side elevation,

part 4 (sealing nut) in front elevation (half section) and side elevation,

part 7 (spindle) in front elevation!

Enter dimension lines without dimension figures! Produce a simple parts list heading!

Given: Part-assembly drawingRequired: Part drawings

1

Stop valve

2

MaterialA l B

Draw part 2 in front elevation, top view (half section) and side elevation in the given position!Enter the dimension lines without figures!

.,

\

Given: Part-assembly drawingRequired: Part drawing ,

Name Class

S 2:1 Vent screw

Date

MaterialC

""39

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Drafting Guide