|
This thread is carried over and continued in the Current Elsmar Cove Forums 
|
|
|
This thread is carried over and continued in the Current Elsmar Cove Forums
|
The New Elsmar Cove Forums
|
 The New Elsmar Cove Forums
 Statistical Techniques and 6 Sigma
 How to determine a machine capability?
|
 UBBFriend: Email This Page to Someone! |
next newest topic | next oldest topic |
| Author | Topic: How to determine a machine capability? |
|
suzi unregistered |
posted 07 March 2001 03:11 PM
 
I'm trying to determinate a machine and process capability and I have those questions. Can I determine a machine capability measuring only one shaft with a plenty of processed surfaces, then each surface has its own fit tolerance, becouse of its cylinderity? If I can should I consider all fit tolerance measuring results for only one shaft? Or should I consider MIN and MAX measured fit tolerance for a plenty of shafts? Is it better for the process control to use XR ratio or Xs ratio? IP: Logged |
|
Rick Goodson Forum Wizard Posts: 102 |
posted 09 March 2001 11:01 AM
 
Suzi This isn't my area of expertise, never the less: Rule of thumb is that you should run 200 pieces if possible but no less than 50 for a machine capability study. One piece will not give you a time component and therefore will not show linear drift of the process. You also need to take subgroup measurements in order to get subgroup averages and then a grand average in order to determine the shape of the distribution. Repost your question in the Tooling and Equipment Suppliers Forum. I believe you will find someone there with practical experience in machine capability studies. Rick IP: Logged |
All times are Eastern Standard Time (USA) | next newest topic | next oldest topic |
  |
Hop to: |
Your Input Into These Forums Is Appreciated! Thanks!
Main Site Search 
