SPC for batch production: cutting tool manufacturing

dear all, we are into the cutting tool manufacturing. so our production system is obviously batch production system. so in one cnc machine we will be producing different products with different geometry in a shift, so how to implement spc in this case, and how to control critical geometry

 

Check out InfinityQS software, it has the ability to handle your concern. It would be worth your time to speak to one of their reps directly.

BTW, I'm not affiliated with the company.

 

If you use Zeiss stuff at all PiWeb is worth looking into as well.

 

What is your batch size for each product? There is a simple technique involving no calculations; the only condition is that the process must be normal & centered with Cpk not less than 1. It is an old technique that I have used in small batch production. It is called Pre-Control. You can find the details in Juran's Quality HB Edition V, Chapter 46 page 1314

 

I'll monitor (using the appropriate variable control chart) separately each product with the critical geometry. Subgroups should consist of measured values representing only a single tool for a specific product with a specific critical geometry. Determining those that with critical geometry will depend on factors such as those with customers' special characteristics, those with high priority level as per your FMEA, etc.