DESIGN DATA ON PRODUCTION METHODS 



273 



Class 26. Mismatching Tolerance 



Mismatching is the displacement of a point in that part of a forging formed by 

 one die block of a pair, from its desired position when located from the part of the 

 forging formed in the other die block of the pair. Mismatching does not include any 

 displacement caused by' variation in thickness of the forging but is only the displace- 

 ment in a plane parallel to the main or fundamental parting plane of the dies. 



Mismatching tolerances are independent of, and in addition to, any other 

 tolerances. 



MISMATCHING TOLERANCE 



Class 2c. Trimmed Size Tolerances 



The trimmed size shall not be greater nor less than the limiting sizes at the parting 

 plane imposed by the sum of the draft angle tolerances and the shrinkage and die 

 wear tolerances. 



Class 3. Draft Angle Tolerances 



Draft angle tolerances are the permissible variations from the standard or nominal 

 angle of draft. 



DRAFT ANGLE TOLERANCES 

 For Drop-hammer Forgings 



(Degrees) 



