A
Hi,
I want to know what is a good lot size?
Suppose if the purchase order is for 50000 parts. We use the C=0 Sampling plans at AQL %1.0 for in-process inspection. So for a lot size of 50000, the number of samples to be inspected is 74. Since 50000 is a large quantity and because we don't have enough confidence in our process, what we do is break that purchase order of 50000 into 10 lots, which is 5000 per lot.
For a lot size of 5000, the number of parts to be measured from the C=0 sampling plans at AQL 1% is 50. So for 50000 and 5000 per lot it would be 10 lots multiplied by 50 i.e 500 parts to inspect instead of the actual 74.
I don't feel this a right way of doing it because we are inspecting 500 instead of just 74. We can't run 50000 parts in a day, the maximum number of parts that we can run is 35000 on a good day and 30000 on an average. This particular part doesn't run on night shift.
What's happening here is since we divide our purchase order into 10 lots, although are Ppk values look good. How much confidence should I have in the process? and I don't know how the ppk value is, if we measure just 74 parts over the 2 shifts to complete the purchase order.
Can someone tell me a solution for this problem?
I want to know what is a good lot size?
Suppose if the purchase order is for 50000 parts. We use the C=0 Sampling plans at AQL %1.0 for in-process inspection. So for a lot size of 50000, the number of samples to be inspected is 74. Since 50000 is a large quantity and because we don't have enough confidence in our process, what we do is break that purchase order of 50000 into 10 lots, which is 5000 per lot.
For a lot size of 5000, the number of parts to be measured from the C=0 sampling plans at AQL 1% is 50. So for 50000 and 5000 per lot it would be 10 lots multiplied by 50 i.e 500 parts to inspect instead of the actual 74.
I don't feel this a right way of doing it because we are inspecting 500 instead of just 74. We can't run 50000 parts in a day, the maximum number of parts that we can run is 35000 on a good day and 30000 on an average. This particular part doesn't run on night shift.
What's happening here is since we divide our purchase order into 10 lots, although are Ppk values look good. How much confidence should I have in the process? and I don't know how the ppk value is, if we measure just 74 parts over the 2 shifts to complete the purchase order.
Can someone tell me a solution for this problem?