V
Hope you can help here in guys...
I need to do a cpk analysis in relation to knee implants we are making...a few details.
1. We have made 36 seperate parts (knee implants) on a CNC as part of
validation
2. One of the CTQ's is tray thickness. This is measured across 8 different
points along each of the 36 parts.
My question is should I average out all the 8 tray thickness values the CMM gives along each of the 8 points for one part and then do the same for the other 35 parts. ...than do the cpk on these 36 values.....or
Do I need to seperate the 8 points i.e Tray thickness 1..tray thickness 2.....right up to tray thickness 8 and treat them as 8 seperate CTQ's....effectively geting 8 seperate CTQ values...i.e for tray thickness 1 I would take the value for it on all 36 parts and run cpk analysis.....then do same for tray thickness 2,3,4,5,6,7 &8 in the same way and thus eventually ending up with 8 cpk analysis values
All vey complicated but any advice is appreciated !!
I need to do a cpk analysis in relation to knee implants we are making...a few details.
1. We have made 36 seperate parts (knee implants) on a CNC as part of
validation
2. One of the CTQ's is tray thickness. This is measured across 8 different
points along each of the 36 parts.
My question is should I average out all the 8 tray thickness values the CMM gives along each of the 8 points for one part and then do the same for the other 35 parts. ...than do the cpk on these 36 values.....or
Do I need to seperate the 8 points i.e Tray thickness 1..tray thickness 2.....right up to tray thickness 8 and treat them as 8 seperate CTQ's....effectively geting 8 seperate CTQ values...i.e for tray thickness 1 I would take the value for it on all 36 parts and run cpk analysis.....then do same for tray thickness 2,3,4,5,6,7 &8 in the same way and thus eventually ending up with 8 cpk analysis values
All vey complicated but any advice is appreciated !!