Dimension tolerance annotation in AutoCAD - Cell-by-Cell Formula Trace

Sample Data

This table shows dimensions with nominal sizes and their upper and lower tolerance values in millimeters.

Cell	Value
A1	Dimension
B1	Nominal Size (mm)
C1	Upper Tolerance (mm)
D1	Lower Tolerance (mm)
E1	Tolerance Range (mm)
A2	Length
B2	50
C2	+0.2
D2	-0.1
E2
A3	Width
B3	30
C3	+0.1
D3	-0.05
E3

Formula Trace

=C2 - D2

Step 1: C2 - D2

Step 2: 0.2 + 0.1

Cell Reference Map

    A       B       C       D       E
1 |Dim |Nominal|Upper  |Lower  |Range  |
2 |Len |  50   | +0.2  | -0.1  |  ?    |
3 |Wid |  30   | +0.1  | -0.05 |  ?    |

The formula calculates the tolerance range in column E by subtracting the lower tolerance (column D) from the upper tolerance (column C) for each dimension.

Result

    A       B       C       D       E
1 |Dim |Nominal|Upper  |Lower  |Range  |
2 |Len |  50   | +0.2  | -0.1  | 0.3   |
3 |Wid |  30   | +0.1  | -0.05 | 0.15  |

The tolerance range column (E) shows the total allowed variation for each dimension, calculated by adding the absolute values of upper and lower tolerances.

Sheet Trace Quiz - 3 Questions

What does the formula =C2 - D2 calculate?

A The difference between nominal size and upper tolerance

B The total tolerance range for the dimension

C The sum of nominal size and lower tolerance

D The nominal size itself

Key Result

Tolerance range = Upper tolerance - Lower tolerance (subtracting negative adds absolute value)

Practice

1. What is the main purpose of dimension tolerance annotation in AutoCAD?

easy

A. To show allowable size variation in a dimension

B. To change the color of dimension lines

C. To add text notes unrelated to size

D. To create 3D models from 2D drawings

Solution

1. Step 1: Understand dimension tolerance annotation

   Dimension tolerance annotation indicates how much a dimension can vary and still be acceptable.

2. Step 2: Identify the correct purpose

   Showing allowable size variation matches the definition of tolerance annotation.

3. Final Answer:

   To show allowable size variation in a dimension -> Option A

4. Quick Check:

   Dimension tolerance = allowable size variation [OK]

Hint: Tolerance shows size limits, not colors or notes [OK]

Common Mistakes:

• Confusing tolerance with color or text formatting
• Thinking tolerance creates 3D models
• Ignoring the size variation meaning

2. Which AutoCAD command is used to set the style of dimension tolerance display?

easy

A. DIMTM

B. DIMSTYLE

C. DIMLINEAR

D. DIMEDIT

Solution

1. Step 1: Recall commands related to dimension tolerance

   The DIMSTYLE command manages overall dimension styles, including tolerance display settings.

2. Step 2: Compare with other commands

   DIMTM is not a standard AutoCAD command; DIMLINEAR creates linear dimensions, DIMEDIT edits dimensions but does not set tolerance style.

3. Final Answer:

   DIMSTYLE -> Option B

4. Quick Check:

   DIMSTYLE sets tolerance display style [OK]

Hint: Use DIMSTYLE to set tolerance style, not DIMTM [OK]

Common Mistakes:

• Choosing DIMTM which is not a standard command
• Confusing DIMLINEAR with tolerance settings
• Using DIMEDIT which edits dimension text

3. Given the following AutoCAD commands sequence:

DIMTM
Set Tolerance Display to Limits
DIMTOLJ
Set Tolerance Justification to Above

What will be the effect on the dimension tolerance annotation?

medium

A. Tolerance values will show as plus/minus and appear inside the dimension line

B. Tolerance values will be hidden and appear below the dimension line

C. Tolerance values will show as limits and appear above the dimension line

D. Tolerance values will show as limits but appear below the dimension line

Solution

1. Step 1: Analyze DIMTM setting

   Setting Tolerance Display to Limits means the tolerance shows as upper and lower limit values.

2. Step 2: Analyze DIMTOLJ setting

   Setting Tolerance Justification to Above places the tolerance text above the dimension line.

3. Final Answer:

   Tolerance values will show as limits and appear above the dimension line -> Option C

4. Quick Check:

   Limits + Above = Tolerance values will show as limits and appear above the dimension line [OK]

Hint: Limits means upper/lower values; Above means text position [OK]

Common Mistakes:

• Mixing up limits with plus/minus display
• Confusing text position above vs below
• Ignoring the effect of DIMTOLJ

4. You set the tolerance display style using DIMTM to 'Symmetrical' but the tolerance text does not appear on your dimension. What is the most likely cause?

medium

A. Tolerance values are set to zero or missing

B. The dimension style is locked and cannot show tolerance

C. You forgot to run DIMTOLJ to position the text

D. The dimension line is too short to show tolerance

Solution

1. Step 1: Understand Symmetrical tolerance display

   Symmetrical tolerance shows plus/minus values around the dimension.

2. Step 2: Identify why text might not appear

   If tolerance values are zero or missing, no text will show even if style is set.

3. Final Answer:

   Tolerance values are set to zero or missing -> Option A

4. Quick Check:

   Zero tolerance means no text shown [OK]

Hint: Check tolerance values before adjusting text position [OK]

Common Mistakes:

• Assuming DIMTOLJ is required to show text
• Blaming dimension style lock without checking values
• Thinking line length hides tolerance text

5. You need to annotate a dimension with a tolerance that shows upper and lower limits clearly above the dimension line, but your drawing has overlapping text. Which combination of commands and settings will best solve this?

hard

A. Use DIMTOL to hide tolerance and manually add text above

B. Use DIMTM to set Symmetrical display and DIMTOLJ to set tolerance text to Centered

C. Use DIMTM to set Deviation display and DIMTOLJ to set tolerance text to Below

D. Use DIMTM to set Limits display and DIMTOLJ to set tolerance text to Above

Solution

1. Step 1: Choose tolerance display style

   Limits display shows upper and lower tolerance clearly, which fits the requirement.

2. Step 2: Position tolerance text

   Setting tolerance text to Above via DIMTOLJ moves text above the dimension line to avoid overlap.

3. Step 3: Evaluate other options

   Symmetrical or Deviation do not show limits clearly; hiding tolerance loses info; manual text is less efficient.

4. Final Answer:

   Use DIMTM to set Limits display and DIMTOLJ to set tolerance text to Above -> Option D

5. Quick Check:

   Limits + Above = clear, non-overlapping tolerance [OK]

Hint: Limits + Above text avoids overlap and shows clear tolerance [OK]

Common Mistakes:

• Choosing symmetrical which shows plus/minus, not limits
• Setting text below causing overlap
• Hiding tolerance instead of adjusting display