Obtaining a bearing, copy the correct size of component in the bearing and draw any convinent scale dimensioning it correctly.

Since no specific dimensions are given, let's assume a simple cylindrical bearing with:

• Outer Diameter (OD) = 50 mm
• Inner Diameter (ID) = 30 mm
• Width (W) = 40 mm

A scale defines the ratio of the drawing size to the actual size. For this example, let's use a scale of 1:2 (meaning 1 unit on the drawing represents 2 units in real life).

• Scaled OD = 50 mm / 2 = 25 mm
• Scaled ID = 30 mm / 2 = 15 mm
• Scaled W = 40 mm / 2 = 20 mm

• Draw a center line horizontally across your drawing area.
• Draw the side view of the bearing. This will look like a rectangle with a smaller rectangle inside it (representing the bore).
• Draw two parallel lines 20 mm apart (this is your scaled width).
• From the center line, measure 12.5 mm up and 12.5 mm down to draw the outer diameter (total 25 mm).
• From the center line, measure 7.5 mm up and 7.5 mm down to draw the inner diameter (total 15 mm).
• Connect these lines to form the rectangular shape of the bearing's side view.

• Linear Dimensions: Use extension lines (thin lines extending from the object) and dimension lines (lines with arrowheads indicating the extent of the dimension).
  • Dimension the width: Draw a dimension line parallel to the width, outside the bearing, and label it 40 mm (this is the actual size, not the scaled size, as per standard drawing practice).
  • Dimension the outer diameter: Draw a dimension line for the OD, label it Ø50 mm.
  • Dimension the inner diameter: Draw a dimension line for the ID, label it Ø30 mm.
• Scale Indication: Clearly write the scale used on your drawing, for example, "SCALE 1:2".

Your drawing will show the bearing at half its actual size, but the dimensions written on the drawing will reflect the actual dimensions of the component (50 mm, 30 mm, 40 mm).