Capability Study for a Honing Machine

L

Lab Geezer

#1
I am a QE for a large manufacture of precision forged gear for power transmission in heavy duty trucks and am trying to establish capibility on a chage from vetrified honing stones to ceramic stones. The problem I am having is that the machine automaticly compensates 1 micron between every part for wheel wear and dresses the stone every 10 parts and then compensates for the dressing. This makes it impossible or at least that I can see to reach our required 1.67 Cpk. Is there a different type of study one should do for this sort of operation? Any help or suggestions will be appericated. My background i many years in mechinical engineering and only a short while in Quality Engineering.:bonk:
 
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#3
Here is the thing....automatic compensation becomes the process. It masks any other process variation (including tool wear). That creates a rough distribution. First, you need to make sure you have enough gage resolution to see the variation, then you need to run 100 parts, and plot them in order (3 compensation cycles). You should measure and report the high and low values of the diameter. If you can get that data and let us check it out, we can help further.
 
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