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7-6 Dimensioning Holes and Fillets

A blind hole is a hole that does not go completely through an object. It has a depth requirement. Figure 7-30 shows a 2.00×2.00×2.00e0466-01.jpg cube with a blind Ø.50×1.18e0466-02.jpg DEEP hole. It was created as follows.

Dimensioning a Blind Hole

  • 1 Draw the block.

  • 2 Click the Hole Wizard tool.

See Figure 7-30.

  • 3 Click the Hole tool in the Hole Type box. Define the hole using the ANSI Inch standard with a Size of 1/2 and a Blind Hole Depth of 1.18in.

  • 4 Click the Positions tab.

  • 5 Locate the hole as shown.

The initial location is an approximation. Use the Smart Dimension tool to specify the exact location of the hole’s centerpoint.

  • 6 Click the green OK check mark.

  • 7 Save the drawing as Block, Blind.

  • 8 Start a new Drawing document and create a front and a top orthographic view of the Block, Blind.

  • 9 Add dimensions to the views.

  • 10 Click the Annotation tab and click the Hole Callout option.

  • 11 Click the edge of the hole, move the cursor away from the hole, define a location for the hole callout, and click the mouse. The hole callout dimension will initially appear as a rectangular box.

Change the height of the text font if necessary.

  • 12 Save the drawing.

Note that the hole includes a conical point. Holes manufactured using twist drills will have conical points. The conical point is not included in the hole’s depth dimension. A special drill bit can be used to create a flat-bottomed hole.

Figure 7-31 shows three different methods that can be used to dimension a blind hole.

Figure 7-32 shows three methods of dimensioning holes in section views. The single line note version is the preferred method.

Dimensioning Hole Patterns

Figure 7-33 shows two different hole patterns dimensioned. The circular pattern includes the note Ø104e0468-01.jpg HOLES. This note serves to define all four holes within the object.

Figure 7-33 also shows a rectangular object that contains five holes of equal diameter, equally spaced from one another. The notation 5ר10e0468-02.jpg specifies five holes of 10 diameter. The notation 4×20(=80)e0468-03.jpg means four equal spaces of 20. The notation (=80)e0468-04.jpg is a reference dimension and is included for convenience. Reference dimensions are explained in Chapter 9.

Figure 7-34 shows two additional methods for dimensioning repeating hole patterns. Figure 7-35 shows a circular hole pattern that includes two different hole diameters. The hole diameters are not noticeably different and could be confused. One group is defined by indicating letter A; the other is dimensioned in a normal manner.

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