9. APPENDIX C - TOLERANCES FOR ROLLED RING FORGINGS

GUIDELINE TOLERANCES FOR ROLLED RING FORGINGS

ALLOWANCES AND TOLERANCES

There are practical limitations in dimensions and other characteristics of seamless rolled rings which vary according to the right and the producer's equipment. The degree of precision attainable in the manufacture of seamless rolled rings is dictated by the essential character of ring rolling equipment and unavoidable contingencies in rolling operations.

Theoretical exactness is seldom attained, and it is therefore necessary to compensate for deviations. The allowances and tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements of rings produced under normal operating conditions.

Experience within the industry shows that dimensional variations in rolling are commonly functions of the dimensions and materials involved. The allowances and tolerances herein are based upon this observed fact.

The experience of producers and purchasers of seamless rolled rings indicate that the allowances and tolerances set forth herein will provide adequate dimensional accuracy for most applications.

DEFINITION AND EXPLANATION OF SEAMLESS ROLLED RING ALLOWANCES AND TOLERANCES

Allowance
The amount of stock added to insure clean up on any surface that requires a subsequent manufacturing operation.

Tolerance
Dimensional variation limits.

 

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DIMENSIONAL PRACTICES FOR SEAMLESS ROLLED RING DRAWINGS 

At the time of first printing of this publication, a transition period existed dealing with the conversion from the customary decimal inch system of dimensioning to the metric system. The following procedures will apply concerning dimensioning on ring drawings: (1) Decimal Inch System _ Inch units of measure on forging drawings will be extended to two place decimals for both part dimensions and tolerances (X.XX); and (2) Metric System _ Metric dimensions on ring drawings will be extended to one place decimal millimeter for both part dimensions and tolerances (X.X). 

UNITS OF MEASURE 

Tolerances in this publication are expressed in decimal inch with metric equivalents in the belief that this represents practice most common in the industry at the time of publication.

NOTE: THESE GUIDELINES ARE BASED ON TYPICAL OPERATIONS IN THE SEAMLESS ROLLED RING INDUSTRY. REFINEMENTS TO THE ENCLOSED ALLOWANCES AND TOLERANCES CAN BE MADE IN RELATIONSHIP TO ANY OF THE DIMENSIONS. OPERATIONS CAN BE PERFORMED BY ROLLED RING COMPANIES TO PROVIDE ADDITIONAL SERVICES WHICH IN MANY CASES MAY REPLACE THE NEED FOR MACHINING. 

MEASURING FOR DIMENSIONAL VARIATIONS

When measuring for inside diameter, outside diameter, and length of a seamless rolled ring, variations such as roundness, concavity, squareness, etc. must be considered.

USE OF ALLOWANCE AND TOLERANCE CHARTS

a.     Extreme length/wall thickness ratios are not necessarily reflected in these guidelines, and thus should be discussed with a seamless rolled ring producer.
      
b.     Outside diameter (OD) and length (L) are the only dimensions necessary when looking for allowances and tolerances on the following charts. (With the exception of those ratios mentioned above in "a", the OD and ID measurements correlate; thus, OD and length are the only necessary axes.)

     

Extreme Wall Thickness Ratios     Extreme Length Ratios

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GUIDELINE TOLERANCES FOR ROLLED RING FORGINGS

ALLOWANCES AND TOLERANCES

There are practical limitations in dimensions and other characteristics of seamless rolled rings which vary according to the right and the producer\'s equipment. The degree of precision attainable in the manufacture of seamless rolled rings is dictated by the essential character of ring rolling equipment and unavoidable contingencies in rolling operations.

Theoretical exactness is seldom attained, and it is therefore necessary to compensate for deviations. The allowances and tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements of rings produced under normal operating conditions.

Experience within the industry shows that dimensional variations in rolling are commonly functions of the dimensions and materials involved. The allowances and tolerances herein are based upon this observed fact.

The experience of producers and purchasers of seamless rolled rings indicate that the allowances and tolerances set forth herein will provide adequate dimensional accuracy for most applications.

DEFINITION AND EXPLANATION OF SEAMLESS ROLLED RING ALLOWANCES AND TOLERANCES

Allowance
The amount of stock added to insure clean up on any surface that requires a subsequent manufacturing operation.

Tolerance
Dimensional variation limits.

 

BACK TO TOP

DIMENSIONAL PRACTICES FOR SEAMLESS ROLLED RING DRAWINGS 

At the time of first printing of this publication, a transition period existed dealing with the conversion from the customary decimal inch system of dimensioning to the metric system. The following procedures will apply concerning dimensioning on ring drawings: (1) Decimal Inch System _ Inch units of measure on forging drawings will be extended to two place decimals for both part dimensions and tolerances (X.XX); and (2) Metric System _ Metric dimensions on ring drawings will be extended to one place decimal millimeter for both part dimensions and tolerances (X.X). 

UNITS OF MEASURE 

Tolerances in this publication are expressed in decimal inch with metric equivalents in the belief that this represents practice most common in the industry at the time of publication.

NOTE: THESE GUIDELINES ARE BASED ON TYPICAL OPERATIONS IN THE SEAMLESS ROLLED RING INDUSTRY. REFINEMENTS TO THE ENCLOSED ALLOWANCES AND TOLERANCES CAN BE MADE IN RELATIONSHIP TO ANY OF THE DIMENSIONS. OPERATIONS CAN BE PERFORMED BY ROLLED RING COMPANIES TO PROVIDE ADDITIONAL SERVICES WHICH IN MANY CASES MAY REPLACE THE NEED FOR MACHINING. 

MEASURING FOR DIMENSIONAL VARIATIONS

When measuring for inside diameter, outside diameter, and length of a seamless rolled ring, variations such as roundness, concavity, squareness, etc. must be considered.

USE OF ALLOWANCE AND TOLERANCE CHARTS

a.     Extreme length/wall thickness ratios are not necessarily reflected in these guidelines, and thus should be discussed with a seamless rolled ring producer.
      
b.     Outside diameter (OD) and length (L) are the only dimensions necessary when looking for allowances and tolerances on the following charts. (With the exception of those ratios mentioned above in "a", the OD and ID measurements correlate; thus, OD and length are the only necessary axes.)

     

Extreme Wall Thickness Ratios     Extreme Length Ratios

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

Return to Table of Contents

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GUIDELINE TOLERANCES FOR ROLLED RING FORGINGS

ALLOWANCES AND TOLERANCES

There are practical limitations in dimensions and other characteristics of seamless rolled rings which vary according to the right and the producer\'s equipment. The degree of precision attainable in the manufacture of seamless rolled rings is dictated by the essential character of ring rolling equipment and unavoidable contingencies in rolling operations.

Theoretical exactness is seldom attained, and it is therefore necessary to compensate for deviations. The allowances and tolerances set forth herein represent what the Forging Industry Association believes to be typical within the industry, as determined by actual measurements of rings produced under normal operating conditions.

Experience within the industry shows that dimensional variations in rolling are commonly functions of the dimensions and materials involved. The allowances and tolerances herein are based upon this observed fact.

The experience of producers and purchasers of seamless rolled rings indicate that the allowances and tolerances set forth herein will provide adequate dimensional accuracy for most applications.

DEFINITION AND EXPLANATION OF SEAMLESS ROLLED RING ALLOWANCES AND TOLERANCES

Allowance
The amount of stock added to insure clean up on any surface that requires a subsequent manufacturing operation.

Tolerance
Dimensional variation limits.

 

BACK TO TOP

DIMENSIONAL PRACTICES FOR SEAMLESS ROLLED RING DRAWINGS 

At the time of first printing of this publication, a transition period existed dealing with the conversion from the customary decimal inch system of dimensioning to the metric system. The following procedures will apply concerning dimensioning on ring drawings: (1) Decimal Inch System _ Inch units of measure on forging drawings will be extended to two place decimals for both part dimensions and tolerances (X.XX); and (2) Metric System _ Metric dimensions on ring drawings will be extended to one place decimal millimeter for both part dimensions and tolerances (X.X). 

UNITS OF MEASURE 

Tolerances in this publication are expressed in decimal inch with metric equivalents in the belief that this represents practice most common in the industry at the time of publication.

NOTE: THESE GUIDELINES ARE BASED ON TYPICAL OPERATIONS IN THE SEAMLESS ROLLED RING INDUSTRY. REFINEMENTS TO THE ENCLOSED ALLOWANCES AND TOLERANCES CAN BE MADE IN RELATIONSHIP TO ANY OF THE DIMENSIONS. OPERATIONS CAN BE PERFORMED BY ROLLED RING COMPANIES TO PROVIDE ADDITIONAL SERVICES WHICH IN MANY CASES MAY REPLACE THE NEED FOR MACHINING. 

MEASURING FOR DIMENSIONAL VARIATIONS

When measuring for inside diameter, outside diameter, and length of a seamless rolled ring, variations such as roundness, concavity, squareness, etc. must be considered.

USE OF ALLOWANCE AND TOLERANCE CHARTS

a.     Extreme length/wall thickness ratios are not necessarily reflected in these guidelines, and thus should be discussed with a seamless rolled ring producer.
      
b.     Outside diameter (OD) and length (L) are the only dimensions necessary when looking for allowances and tolerances on the following charts. (With the exception of those ratios mentioned above in "a", the OD and ID measurements correlate; thus, OD and length are the only necessary axes.)

     

Extreme Wall Thickness Ratios     Extreme Length Ratios

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

BACK TO TOP

Return to Table of Contents

', )