Hi all,

This is my first post and won't be my last....so here goes.

I have been asked to create a X bar R chart using XYZ coordinates. The measurements have been taken for an Addison Addata Measurer and the part is a bent tube that have been formed using an Addison Bender.

Please can someone point me in the right direction to get me started.

Many thanks.

Peter:thanx:

Hello, Peter! Welcome to the Cove!!

First, let me encourage you to catch up on the charting threads. If you will look at the bottom of the page of your post, you will see several related threads on X-R bar charts. They should be of assistance.

Also, always feel free to use the search function.

Are you wanting to have one chart for all three measurements, or three charts for each? I'm thinking one for each, that way you can track each part of the bent tube.

Are you thinking you want one chart for each?

Since you are doing XYZ coordinates, perhaps you need an X-bar R, and a Y-bar R, and a Z-bar R chart! :rolleyes:

Seriously, Brad had some good advice. Check the other threads and search around here for specific advice if you need. It is always hard to know just what level of advice to give , so go ahead and ask more specific questions if you don't find what you need.

You could certainly make three charts - one for each coordinate. You might also do some calculations on the original data (like the overall deviation from the center = (X^2 + Y^2)^0.5 and plot that on a chart.

Basically decide what are the important characteristics and watch those on the charts.

Tim F

Without going to deep here and now, if you are going to create an X bar chart I’m assuming you still have the raw export file in digital format. Probably in an ASCII format (text file). Before going down the route of creating many run charts for each axis (XYZ) I would strongly recommend that you keep it simple and load the export file (or results file) back into the software that created it. Then search through your options within the software, or consult the dreaded user guide, and look for an option to generate the true 3D deviation for each measurement point.

Every software that I have come across has the ability to export files as both the raw XYZ coordinates but also as the theoretical deviation that I refer to as the 3d deviation (it could be known as something else in your software). This will give you the unique point as a nominal (calculated from the XYZ coordinates) and the corresponding actual. That way you can plot the contour of the formed tubing with one chart.

I hope this helps

Wow Cheers for the advice guys. :thanx:

I did do a search but could not find what I was after, however I will have another look.

What I was thinking of doing was a chart for each of the measurements as Brad and Tim suggested, which is the impression of how the customer whats it.

However before I start it I'm going to have a look at the software as Lee says and see if there is a way round it that way.

I think I follow what your on about Lee.


Thanks again guys.

Peter.