How to find a reference line for " Form Tolerances"?
Engineering Asked by Sam B on May 10, 2021
In my project I have to choose a form tolerances ( parallelism ) between the handle ( purple part ) and the part that sits inside it ( the grey part ), where the two parts slide on each other.
But I don’t know how to choose the right reference line on my technical drawing ( drafting ). 
One Answer
You have to show two reference lines for tolerance measurements. One is the longitudinal axis of the linked parts. The other one is the line through the center of the pin as shown below.
Does this answer your question?
Correct answer by r13 on May 10, 2021
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