Tolerance symbol

1. PCET’S NMIET
Presentation On:
TOLERANCE SYMBOL
By:-
1. Jadhav Lalit Vilas TEMA121
Guidance By:-Prof Khetre Sir

2. INDEX
SR NO TOPIC NAME
1 What Is Tolerance Symbol
2 Types Of Tolerance Symbol
3 Straightness
4 Circularity
5 Cylindricity
6 Flatness
7 Parallelism
8 Perpendicularity
9 Concentricity
10 Reference

3. What Is Tolerance Symbol?
Geometrical tolerances which are assigned
to features related to a datum do not limit
the form deviations of the datum feature
itself. It may be necessary to specify
tolerances of form for the datum feature.

4. Types Of Tolerance Symbol
 Straightness
 Circularity
 Cylindricity
 Flatness
 Parallelism
 Perpendicular
 Concentricity
 Reference

5. Straightness
The tolerance zone, in the considered plane,
is limited by two parallel straight lines a
distance apart and in the specified direction
only.

6. Circularity
circularity tolerance is used to control
the roundness of circular parts or features.

7. Cylindricity
Cylindricity is a 3-Dimensional tolerance
that controls the overall form of a
cylindrical feature to ensure that it is round
enough and straight enough along its axis.

8. Flatness
The actual surface shall be contained
between two parallel planes distance.

9. Parallelism
The tolerance zone is limited by two
parallel planes a distance apart. The planes
are parallel to the datums and in the
direction specified.

10. Perpendicularity
The tolerance zone is limited by two
parallel planes a distance apart and
perpendicular to the datum.

11. Concentricity
The tolerance zone is limited by a circle of
diameter the tolerance value shall be
preceded by the symbol . The center of the
circular tolerance zone coincides with the
datum point.

12. Reference
 Print Citation
A Textbook Of Machine Design By
R.S.Khurmi
 Web Citation
http://www.engineeringessentials.com

13. THANK YOU.