Question
Download Solution PDFWhich of the following compass is used to scribe a circle or an arc with a large diameter?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Trammel compass
- It is used to draw large circles or arcs that are beyond the limit of the dividers
- It consists of a bar with two movable heads
- Parts of the wing compass are shown in Figure.
- The legs of the wing compass are hinged at the top or joined with spring and forced open or closed by turning a knurled knob that attaches to a threaded post spanning the legs.
- The spring compass is used to draw circles and small arcs of 25 mm radii.
- The screw and nut arrangement is used to set the radius accurately
Important Points
- When using a spring-type wing compass the measurement once taken will not vary while marking.
- The two legs of the compass should always be equal in length.
- The compass is specified by the type of joints and length.
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