2 questions
2 questions
(OP)
1. A disc has the thickness of .100+.010/-.005 and associated with the thickness above a straightness callout with Diametric symbol and tolerance of .005 at MMC. The question is do we need the diametric symbol in this application?
What is the tolerance zone shape : two parallel planes or cylindrical?
2. A cone has an included angle of 90 degrees ( 45 degress to the centerline of the cone). The question is do we need the 90 degrees basic to define the cone or 90 degrees basic is implied?
The cone will be define with profile or maybe composite or even two single segments profile.
Thank you
What is the tolerance zone shape : two parallel planes or cylindrical?
2. A cone has an included angle of 90 degrees ( 45 degress to the centerline of the cone). The question is do we need the 90 degrees basic to define the cone or 90 degrees basic is implied?
The cone will be define with profile or maybe composite or even two single segments profile.
Thank you





RE: 2 questions
2. This was discussed before. Opinions differ. My personal approach is that when there is a possibility of misinterpretation, one should clearly state the angle on the drawing, even if it is 90 deg. angle.
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: 2 questions
Q#2: Fair enough! You could not be too explicit, only too ambiguous.
RE: 2 questions
2. Technically, the angle doesn't need to be dimensioned, because anything that looks like 90º is presumed to be 90º. Just because the 90º corner is rotated from how we normally think of a corner doesn't change the rule. However...in the real world it's OK to put the 90º on the print.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems