I have a bore that is Datum B. It has a perpendicularity callout to Datum A, which is a flat surface. So, I have to measure it as a cylinder. I have another bore that has a circular runout callout to AB. So do I have to measure B again as a circle? Because I would have to assign that as another datum to build the feature control frame. But if I just use B as a cylinder, then wouldn't it be measuring total runout and give me a different result than circular runout?
Thanks. Before my current job, I worked at a place that did fabricated parts from a brake press with sheet metal and had never seen runout before. I'm struggling to understand it.
I understand completely. Worked as a programmer measuring exhaust systems. My current job has multiple exhaust fan assemblies and furnace wheels so there is a lot of runout parts. I had the same challenge as you. had to learn it and understand it but it definitely takes some time and brain power. You cant know something you don't know..... ya know? lol
Good luck and if you don't have one already.... grab a copy of y14.5. I may not comprehend everything in the book but ive been able to establish a pretty solid understanding of most GD&T.
Thanks. Before my current job, I worked at a place that did fabricated parts from a brake press with sheet metal and had never seen runout before. I'm struggling to understand it.
I understand completely. Worked as a programmer measuring exhaust systems. My current job has multiple exhaust fan assemblies and furnace wheels so there is a lot of runout parts. I had the same challenge as you. had to learn it and understand it but it definitely takes some time and brain power. You cant know something you don't know..... ya know? lol
Good luck and if you don't have one already.... grab a copy of y14.5. I may not comprehend everything in the book but ive been able to establish a pretty solid understanding of most GD&T.
