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Tolerances - Casting Tolerances, Closed Tolerance | Tamboli Castings Limited

ISO     9001 : 2008 TS     16949 : 2009 ISO     14001 : 2004 OHSAS     18001 : 2007 CERTIFIED COMPANY

General Tolerances

GENERAL TOLERANCES

These tolerances apply as a general rule of thumb. Closer tolerances can be obtained depending
on part design or the use of special procedures or secondary operations.

Up to 25 mm ± 0.127 mm
Up to 50 mm ± 0.254 mm
Up to 75 mm ± 0.381 mm
Up to 100 mm ± 0.508 mm
Up to 125 mm ± 0.635 mm
1030 ASTM A-27 Gr.70-36 ± 0.762 mm
LATNESS – METRIC
Flatness refers to single plane surface and is usually a function of volumetric shrinkage
Range of nominal dimension (mm) For Straightness / Flatness (mm)
OVER UPTO
As cast TIR Machined TIR
0 10
0.12 0.08
20 25
0.15 0.10
25 50
0.20 0.15
50 75
0.30 0.20
75 100
0.40 0.25
100 150
0.55 0.35
200 300
0.95 0.70
CONCENTRICITY
Range of nominal dimension (mm) For Straightness / Flatness (mm)
OVER UPTO
As cast TIR Machined TIR
0 10
0.12 0.08
20 25
0.15 0.10
25 50
0.20 0.15
50 75
0.30 0.20
75 100
0.40 0.25
100 150
0.55 0.35
200 300
0.95 0.70
ROUNDNESS-SOLID BARS
Roundness is a function of normal shrinkage variations in the metal. Shrinkage variation increases with diameter and the tolerance required increases proportionately. A general rule of 0.127 mm per 25 mm may be applied.
ANGLES
As-cast tolerances of angles depend on their location in casting. They range from ± 1/2° for well supported positions to ± 2° where inherent distortion could be expected. Inclusion of gussets and ribs often minimizes distortion and many sections can be mechanically straightened.
HOLE POSITIONING
0.127 mm per 25 mm from any single reference point.
BLIND HOLES
Blind holes can be cast if length does not exceed the diameter
SURFACE FINISH
Average Ra value generally ranges between 3.20 to 5.50 microns.

PROCESS CAPABILITY

With the technology developed and refined over a period of time, the company is able to produce casting with very close tolerance and surface finish to international standards.

GENERAL TOLERANCES

DRAWING SPECIFICATIONS

SPECIFICATIONS

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