Constraint Questions

Below are questions to test your knowledge and understanding of 2D and 3D constraints.

Before you continue, make sure you have studied the theory by clicking here.

Questions

Question 1

Question 2

Question 3

Question 4

Question 1

a. Describe, using 3D CAD terms, how to assemble and constrain the axle and main arm onto the base so that the main arm will sit at 20° to horizontal. You may annotate the illustration and use sketches to support your answer. (4 marks)

Answers

Centre axis the axle, the hole through the main arm and base together
Mate one of the inner sides of the axle to one of the outside flat sides on the base
Orientate the main arm to an angle of 20 degrees
Offset 13mm the centre of the main arm to inner edge of the base or Mate centre of main arm with the centre workplane of the model

Question 2

3D CAD modelling software was used to create the sub‑assembly of the door handle shown below.

a. Describe, using 3D CAD terms, how to constrain the three door handle components. You may annotate the drawings and use sketches to support your answer. (4 marks)b. Explain the term sub‑assembly. (1 mark)

Answers

Spindle to handle (max two marks available):

Mate three correct surfaces on the spindle to the handle (2 marks)
Mate two correct surfaces on the spindle to the handle (1 mark)
Mate one correct surface on the spindle to the handle (0 marks)

Rose to handle (max two marks):

Centre axis constraint the rose to the handle (1 mark)
Offset (15mm) constraint correctly applied to rose (1 mark)

b. (Answers to explain questions must have a cause and an effect)

Components create an assembly that is used within another assembly

Question 3

A concept design for the blade sub-assembly for the blender is produced. The two blades shown have been constrained to the pin using 3D CAD modelling software.

a. Describe the steps required to constrain the blades and pin to each other. (4 marks)

Answers

Centre Axis all three components.
Mate the top surface of Blade One to the underside of the Pin head
Offset 10mm between the two correct surfaces (top or bottom).
Orientate at a 120-degree angle using an angular constraint.

Question 4

A concept design for the clock hands sub‑assembly is produced. The two hands shown have been constrained to the shaft using 3D CAD modelling software.

a. Describe the steps required to constrain the hands and the shaft to each other. You may annotate Figure 1 to help with your answer. (4 marks)

Answers

centre axis all the components
mate hand 1 to the flat face of the shaft
offset hand 1 and hand 2 by 2mm
orientate hand 2 by 90 degrees

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