So today was a disappointing day, I can't go into details of the part but I outsourced a heap of stuff to a CNC place. They have made these parts before and everything has been cool. Today I found the whole batch of 100 parts are unusable... Fuuuuuuu!!!
I don't have a quality control person at work because we employ tradesmen who do that as they go, they all know I don't except failures and they all do a great job. If a part isn't correct it never leaves the factory.
I except the same from companies that I send work to, I will check the first batch and if good I don't check the next time as I should be able to trust them. Its not that hard!!
Having a good look at the current batch and parts from the last I can tell they were machined in a totally different set up. Lathe jaw marks here not there etc. Different surface finishes so feed rates are different bla bla bla ... How can you let a part go out the door that is way out of tolerance and not worry about it?
I do want to be careful that I'm not airing my companies dirty laundry out (don't want to be too specific), but let me assure you that it isn't just you.
Fortunately, a lot of our stuff we can return to the factory/manufacturer and get replacements when they send us bad/broken items, but I have to be on top of everything I receive at my location.
The worst thing recently was we had to piece out some work to a local machine shop, and they weren't cheap. Part didn't fit, but to make matters worse, you have to drive 3hrs away to test fit the piece. This happened a couple of times. I met our maintenance manager at the plant once; we tried the part again. Didn't fit. Measured the shit out of it (again). By this point we'd sunk a lot of our margins on this job just paying this machine shop, but we just weren't sure WTF was wrong. Some sort of metric Acme equivalent? Did the original machinist decades ago run his own homebrewed threading that was slightly off? You'd get the piece started, and it would immediately cant the whole piece 10-20 degrees.
We just had to replace most of our machine shop (hence having to send work out that we'd usually do internally, much quicker and cheaper). One of the new guys asked to see the part. His hunch was that the leads/starts were ground down at a really weird angle. The nose did look weird. So he reground the start, and they overnighted it to the site (I was going there the next day for visit #4 anyways). We get the part on site while I'm there, we try it; fits perfectly.
At this point, we either pay the outside machine shop even more money to machine the rest of the set (this was the first of several) when they were kind of highballing us and messed up on the maching somewhat (to be fair, though, I don't think they have experience with this), or we take this back internal even after we'd paid the outside company and they'd already machined test taps, tools, etc, and do the rest ourselves. We decided on the latter, but this whole fiasco was NOT CHEAP.
And even beyond the $$$, it makes us look bad when our customer is like
"What exactly is the issue here?!?". We were fucking irate.