Example of drawing a small hand vice

A common artefact in any workshop is a small vice. Such a small engineering vice is shown in Figure 3.1. The main body of the vice is a stubby 'U' shape in which a movable jaw is positioned between the two uprights. The movable jaw is actuated by a screw which is rotated by a small bar. Although the drawing is 'busy', the different lines help to make the artefact jump out from the page. This has been done by the use of different types of line thicknesses (thick and thin) and different types of line styles (continuous, discontinuous, dash, chain dotted). This is an assembly drawing and is not meant to provide any manufacturing details. The individual components making up the vice are numbered using a 'balloon' reference system, i.e., small circles with the part numbers in them. The assembly drawing is of little use on its own because it needs a list to identify each individual part within the assembly. Such a parts list or item list is shown as part of the drawing in Figure 3.1.

Part Drawing And Asembly Dimention

VICE ASSEMBLY DRAWING Not to scale

Figure 3.1 Assembly engineering drawing of a small hand vice

Item List

.i

Plate Screw

9

i

Plate

8

4

Insert Screws

7

.1

Tommy Bar

6

1

Jaw Clamp Screw

S

1

Bush Screw

4

1

Bush

3

1

Movable Jaw

?

2

.Hardened Inserts

1

1

Ni?.

No. Off

Description

VICE ASSEMBLY DRAWING Not to scale

Figure 3.1 Assembly engineering drawing of a small hand vice

Figure 3.2 is a third-angle orthographic projection 'detail' drawing of the movable jaw (part number 3). It gives all the information necessary for the part to be manufactured. The outline is drawn in thick (or wide) lines whereas additional information (e.g. hidden detail or section hatching) is drawn in thin (or narrow) lines. The thick lines are deliberately drawn so that shape and form 'jump' out of the picture. With regard to the front elevation, the 'equals' sign at either end of the centre line shows that it is symmetrical about that centre line. The 16mm wide tongue is thus centrally positioned in the front elevation and there is no need to dimension its position from either side. There are further outcomes from this symmetry. Firstly, both underside surfaces that contact the body (as shown by thick chain dotted lines) are to be polished such that the average surface finish (Ra) is less than 0,2um. Secondly, the counter-bored 5mm diameter holes are identical. The right-hand elevation is a section through the centre of the jaw but nothing tells you this. This is the designer's decision of how much to include in the drawing, called 'draughtsman's licence'. The side elevation shows that there is a vertical threaded hole in the base. The various line thicknesses of the threaded hole show that the initial hole is to be drilled (note the conical end) and then threaded to M8. The 'M8' means that it is a metric standard 8mm diameter thread. The designation 'M8' is all that needs to be stated since full details of the thread form and shape are given in ISO 68-1:1998. The 'xlO/12' means that the drilled hole is 12mm long and the thread is 10mm long. The right-hand side elevation section also indicates that the horizontal central hole is counter-bored. The dimensions of this hole are shown in note form on the inverted plan. The initial hole is 10mm diameter which is then counter-bored to 15mm diameter to a depth of 7.5mm with a flat bottom (given by the 'U'). The position of the hardened insert is shown on the sectioned right-hand elevation. It is shown in outline by the double chain dotted thin line. On the side elevation sectioned view, the position of the M8 hole is not given. In such instances as this, the implication is that the hole is centrally placed and since its exact position is not critical for functional performance, it perhaps does not matter too much. However, in product liability terms, all dimensions should be given and none left to chance. Thus, if I were drawing this for real in a company inj I

32 crs

Position of hardened insert polish

'Ra0,2um

-4-

in

.4-,

y/\

5-

" 1 1 1

2x<!> 8x5U <t>5 /

-LÜ-

X10/12

MOVABLE JAW.

Part No 3.

Material: mild steel. All dimensions in mm. Not to scale.

Figure 3.2 Detailed engineering drawing of the 'movable jaw', part number 3

I would label its position as 10mm from the left-hand or the right-hand side. However, to illustrate the point, I have left it off the drawing. The inverted plan (lower left-hand drawing) is a staggered section projected from the front elevation. The staggered section lines are shown by the dual thick and thin chain dotted lines terminating in arrows that give the direction of viewing. Thus, the inverted plan is a part section.

Figure 3.3 shows a detail drawing of the hardened insert (part number 2). This illustrates some other principles and applications of engineering drawing practice. Two views are shown. Note that the hardened insert is symmetrical as shown by the centre line and the 'equals' symbols at each end. Hence, I chose only to show one half. With regard to the left-hand side elevation, the side is flame hardened to provide abrasion resistance. The 'HRC' refers to the Rockwell 'C' hardness scale. The M5 threaded hole is 15mm from the lower datum place and the hole insert is 30mm high. The M5 hole could have been shown as being symmetrical with 'equals' signs on the other centre line instead of being dimensioned from the base.

Only two detail drawings (Figures 3.2 and 3.3) are shown for convenience. If this were a real artefact that really was to be manufactured, detailed drawings would be required for all the other parts. However, there is no need to provide detailed drawings of standard items like the screws.

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Responses

  • Antje
    How to label assembly drawing?
    9 years ago
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    How to design movable jaw of vise?
    8 years ago
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    What not to section in an assembly drawing?
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