individually test vs batch tested bcgs

[Nguyen]

Just want to confirm, the difference between individually tested and batch tested is that batch tested they take 1 sample and test it... while individually tested means each bcg gets tested. Right?

Or does batch tested means all of them gets tested as a batch and individually tested means they get tested one by one?


I'm talking about the MPI and HPT testing they do on bcgs.

[Dezrat]

MPI and HP testing, when done, is on the Bolt only not the BCG, just so you're clear on the issue. maybe that's what you meant?

[CWDraco]

Batch test means they test a certain % of the entire run. Its not random, they actually know when to test. They are looking for certain defects.

So the run is 100, they test the Ninth, the Fifty-ninth, the seventy-ninth, eighty-ninth and number 100.

If 9 fails, they stop the whole run and figure out whats wrong.
If 59 fails, they test 60-63, if any of them fail, they stop the whole run and figure out whats going on.
If 79 fails, they again test 80-83, and again if 89 fails they test 90-93 blah blah blah.
If 100 pass, they reset the tooling and test # 109...
repeat...

On individual test, its pass or fail for every one.

[russ69]

On a military contract it is up to the quality control team to come up with the quality plan. That includes any testing procedures. It's rare to have parts 100% inspected/tested.

[Nguyen]

MPI and HP testing, when done, is on the Bolt only not the BCG, just so you're clear on the issue. maybe that's what you meant?

I mean the bolt, sorry.

Batch test means they test a certain % of the entire run. Its not random, they actually know when to test. They are looking for certain defects.

So the run is 100, they test the Ninth, the Fifty-ninth, the seventy-ninth, eighty-ninth and number 100.

If 9 fails, they stop the whole run and figure out whats wrong.
If 59 fails, they test 60-63, if any of them fail, they stop the whole run and figure out whats going on.
If 79 fails, they again test 80-83, and again if 89 fails they test 90-93 blah blah blah.
If 100 pass, they reset the tooling and test # 109...
repeat...

On individual test, its pass or fail for every one.

On a military contract it is up to the quality control team to come up with the quality plan. That includes any testing procedures. It's rare to have parts 100% inspected/tested.

Cool, thanks for the replies guys.

[9mmContagion]

In the machine industry we inspect on AQL levels. The lot is inspected per quantity of parts. Ex. 100 pcs in lot inspected at a .40 AQL= 32 pcs inspected. If any of those 32 parts fail any inspection criteria, the entire lot must be inspected 100%. This inspection is also an addition to manufacturing inspections, which in our shop is a Run 5 check 1 inspection as they are pulled off of the machine. These in process inspections can be increased or decreased depending on machine (i.e. 5 axis mill vs 3 axis mill vs Swiss machine- Swiss machine is rather accurate and requires less inspection).