Engineering Drawing Car Jack

Car Jack Assembly Drawing Autocad

Figure Q65

66. Obtain a component that is simple and commonly available and produce a detail drawing of it sufficient for it to be manufactured. Such a component could be: a paperclip, key, drawing pin, ruler, centre punch, coat hook, glass jar, special nut or washer or bolt (e.g. casellated, lock), spanner, nail, paper cup, plastic cup, CD, needle, cotton reel, cable tie, house brick, cardboard cereal box.

67. Beg, borrow or buy an artefact that consists of an assembly of parts and perform a reverse engineering exercise on it by analysing the constituent parts, making measurements, working out how the parts were made, the materials, the processes and how they are assembled. From this analysis, draw an assembly drawing of the artefact, detail drawings of the parts and an item list in third angle projection. Include dimensions and tolerances sufficient for it to be made.

■ Typical candidate small-scale assemblies are: a bicycle pump, torch, pencil sharpener, floppy disk, audio tape, audio tape box, CD box, fizzy drink can, craft knife, electrical plug or socket, door lock, stapler, paint brush, biro, pencil, pipe clip, hole centre punch, highlighter, door handle, 'Sellotape' dispenser.

■ Typical candidate large-scale assemblies are: a desk, chair, stool, bench, bookcase, door, window, shelving system, ducting, rainwater piping, cardboard box and its packaging, road sign, manhole cover, picture frame, filing tray set, lamp, car jack, TV aerial, stepladder, flat-pack furniture.

68. The drawing in Figure Q68 shows a section through a relief valve assembly. The spring length within the assembly is 52,00mm and it has a rate of 1.05kg/mm. The critical dimensions are as follows: a = 58,00 ± 0,1; b = 3,00 ± 0,1; c = 18,00 ±0,1 and d = 2,00 ± 0,05. The body, cap and piston are made of steel and the washer of aluminium alloy. Using scaled measurements, draw detail drawings, an assembly drawing and an item list in third angle projection. Add dimensions and tolerances sufficient for it to be made.

69. A company makes a hinge for wooden doors, see Figure Q69(a). The hinge consists of three parts: two identical drilled and folded strips and a pin. The flat part of the strip is 75mm wide,

Assembly Drawing Bench Vice

Figure Q68

20mm wide and 1,5mm thick mild steel. The holes for the screws are 5,5mm diameter. The hole centre distances are as shown in the figure.

The sketch in Figure Q69(b) is a designers 'ideas' sketch for the small hand-held jig to be used for drilling the wood-screw holes in the hinge strips. The jig is to consist of a base body and a top plate. The top plate needs to be screwed to the base body so that it can be removed and replaced by another plate having a different arrangement of holes. The top plate needs to have three holes in it for drill bushes, four holes for clamping it to the base and hole/s for some form of clamping bolt/s to hold the hinge during drilling. The jig is to be made from medium carbon steel. The clamping bolt/s need only be simple hexagonal headed ones. A drawing of the company's standard 5,5mm-drill bush is shown in Figure Q69(c).

Design the jig (i.e. you decide the bolt sizes and the jig slot size to receive the strip, etc.) and hence draw an assembly drawing, detail drawings and an item list of the jig in third angle projection. Add dimensions and tolerances sufficient for it to be made.

Pillar Drill Clamp 3rd Angle

Figure Q69(c)

Figure Q69(c)

70. The following exercise has been used for a number of years at Brunei University as the 'design and make' project. It involves the design and manufacture of a set of weighing scales. Every student designs and makes his or her own set.

The scales comprise of four basic sets of parts: a weighing sensor, electronic circuit, support frame and pan. The sensor assembly is shown in Figure Q70(a), the circuit assembly in Figure Q70(b) and the item list in Figure Q70(c). Note, Figure Q70(b) shows the position of the LED's on the front face of the PCB when their output values are read through the Support Plate. The two Leaf Springs (Figure Q70(a)) to which strain gauges are cemented, are made of spring steel. Each has two 5.2mm holes drilled at the ends. These holes are for the M5 bolts clamping them to the Block at one end and the M5 Stud clamping them to the Spacer at the other. Above the Spacer is the Pan Base on top of which is the Pan. M5 bolts clamp the sensor assembly to the Support Plate. The electronic circuit panel (Figure Q70(b)) is attached to the Support Plate via adhesive pads on the PCB support pillars that need to be positioned such that the two LED's can be read through a cutout. A battery is attached to the Support Plate, via an adhesive pad. Two switches (on/off and reset), the connecting wires, the strain gauges and the electronic circuit complete the construction.

There is no freedom of design with the PCB circuit or the sensor because the unit would not work if these were to be changed.

There is complete freedom of design with respect to the pan and the support plate. The pan is made of steel sheet and is the part of the scales on which the bag of sugar (or whatever) is placed. The aluminium support plate is the 'body' of the scales, which holds everything together.

Electronics Engineering Drawing Plates

PCBPMvlMt. Iii stmtPia*

4oflhotMtoi«M ,

Printed Circuit Board (N)

Part

Component

No

Material

Operation

Size/Length [mm] I

A

Leaf Springs

2

Steel

Supplied

65x10x0.7 with holes j

B

Block

1

Alum

M/ced

Raw material is 22.3 x 12.7 plate. Student to cut off a 32mm length from the plate and mill to size. Final size to be 20 x 30 x 12.7 with N5.2 holes

C

Spacer

1

Steel

M/ced

Raw material is N11.1 steel bar. Student to cut off a 22mm length from the bar and turn to size. Final size to be N10 x 20 long (plus N5.2 central hole).

D

Pan Base

1

Brass

M/ced

Raw material is N23.7 brass. Student to cut off a 15mm length from the bar and turn to size. Final size to be N23.7 x 14 with a 1mm step and a M5 hole.

E

Bolt M5 x 30

1

Steel

Supplied

F

Stud M5

1

Steel

Supplied

Cut to length

G

Nuts M5

2

Steel

Supplied

H

Strain Gauges

2

Supplied

Cemented to Leaf Springs

I

Pan Stud Rivet

1

Steel

Supplied

M5x8. Punched into Pan through the N5.1 hole

J

Pan

1

Steel

Cut/form

Raw material is 0.91 mm (20 gauge) x 130 x 130 steel sheet. Student to decide final size and proportions but no less than 960x60. Rivet hole drill 5.1

K

Support Plate

1

Alum

Cut/form

Raw material is 1.2mm (18 gauge) x 150 x 250 aluminium sheet. Student to decide final size.

L

Bolts M5 x 25

2

Steel

Supplied

(For bolting Block to Support Plate)

M

Nuts MS

2

Steel

Supplied

(For bolting Block to Support Plate)

N

Electronic Circuit

1

PCB& compts

Assemble & solder

Components soldered to PCB. Final PCB size is 1.7 x 100 x 80.

0

Wire to Gauges

2

Wire

Cut

Cut to lencjh

P

Switch

1

Supplied

2 off N6.5 holes needed in the Support Plate for mounting holes, 15mm clearance needed behind and 17 in front

Q

Reset Button

1

Supplied

R

PCB Pillars

4

Plastic

Supplied

Insert into PCB & stick onto Support Plate

Figure Q70(c)

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Responses

  • FRANK
    How to draw carjack on draw something?
    8 years ago
  • wilibald
    How to assemble bench vice?
    4 years ago
  • pirkko
    How to draw bench vice in engeneering drawing methad?
    4 years ago
  • felix
    How to draw aluminium vice part drawing and assembly drawing?
    3 years ago
  • Inigo
    How to draw a cover plate in engineering drawing?
    3 years ago
  • JAY
    HOW TO DRAW A CAR JACK?
    2 years ago
  • Jak
    How to draw a car jack in orthografic projections?
    2 years ago

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