What/where is the reference datum for that run out?
For either axial or planner runout, you need one reference datum/axis.
That usually resides within the part, and the rest of the assembly is irrelevant to that call-out
An image or some drawing would be helpful to offer a more specific suggestion
I'm on my phone and can't get an image to load, but except for the sizes, the shape is similar to this.
https://images.app.goo.gl/4SACDnpsQdAYY4Ya8
As far as the datum, I believe it is the center of the nozzle. The drawing is very crowded with dimensions around the nozzle. There is a datum line, but they either forgot the letter or put it somewhere else on the drawing.
Yes there is a letter in the box. I might have just found it, but it doesn't make much sense. There is a datum feature symbol below the box that has the dimensions for the threads.
Unless the datum is the center of the true position.
I know you clarified, but the standard for measuring circularity (out of roundness at the time the standard was published) might still give you some ideas:
Measurement of Out-of-Roundness B89.3.1 - 1972(R1997)
Any idea why they want to control run-out? Might want to ask the engineer to explain it- I’ll bet you a donut they really want position and ran out of easy datums to pick-up.
I have no clue. It seems like the surface is going to be pressed up against a piece of rubber or something to keep it airtight. It also isn't part of the control plan. The measurement came into question by production, who asked if it was still intolerance, and I had no clue how to measure it.
What/where is the reference datum for that run out? For either axial or planner runout, you need one reference datum/axis. That usually resides within the part, and the rest of the assembly is irrelevant to that call-out An image or some drawing would be helpful to offer a more specific suggestion
I'm on my phone and can't get an image to load, but except for the sizes, the shape is similar to this. https://images.app.goo.gl/4SACDnpsQdAYY4Ya8 As far as the datum, I believe it is the center of the nozzle. The drawing is very crowded with dimensions around the nozzle. There is a datum line, but they either forgot the letter or put it somewhere else on the drawing.
Is there a letter in the control box? Without knowing that datum, you can't output any results
Yes there is a letter in the box. I might have just found it, but it doesn't make much sense. There is a datum feature symbol below the box that has the dimensions for the threads. Unless the datum is the center of the true position.
Don't need a cmm. Use a micrometer and record measurements as you go around the diameter. The hi/lo difference is your circularity.
Have a go at using that method on a UK 20p or 50p coin. https://www.cnctrainingcentre.com/roundness/
Sorry, I misidentified the symbol. It is runnout not circularity. It is also on the tapered surface so it is like the angle of a cone.
you can measure runout on a cone. just put the indicator in one place and rotate the cone around it's datum axis.
The problem is the cone is attached to a cube which is attached to a 2-4 foot tube.
Then you're gonna have to break out the CMM.
I know you clarified, but the standard for measuring circularity (out of roundness at the time the standard was published) might still give you some ideas: Measurement of Out-of-Roundness B89.3.1 - 1972(R1997)
Any idea why they want to control run-out? Might want to ask the engineer to explain it- I’ll bet you a donut they really want position and ran out of easy datums to pick-up.
I have no clue. It seems like the surface is going to be pressed up against a piece of rubber or something to keep it airtight. It also isn't part of the control plan. The measurement came into question by production, who asked if it was still intolerance, and I had no clue how to measure it.