ToolmakerTH
Plastic
- Joined
- Jul 19, 2022
Just want to rant and get this off my chest because I am dealing with the same shit with multiple customers at this moment.
I have been gaining new works from both old and new customers this past year, so I have been doing alot of sample pieces for them before we go into production. This week, there are 2 cases of rejects from 2 different customers, both are repeat customers.
Case #1 - The sample parts were rejected due to threaded holes being "too loose". They checked with Go NoGo gauges just like I did and they passed the gauge inspection. However, they said they think there is too much slop even if the NoGo gauge can not go in. Well, isn't the point of Go NoGo gauges so you don't have to use your judgement?! What worse was that they cut the part to see the cross section of the thread and saw that the threads were not pointy because I used a roll tap, which they have no idea what the process is. I explained the technical to them and showed them videos of thread rolling. They still didn't care and proceeded to blame the thread rolling process for the "loose" thread. Now, how am I going to measure the threads if I have to go by their "feel"?
Case #2 - This is a very simple pin part. The diameter tolerance is not difficult to machine at all. The part was machined on a cnc lathe and passed all the inspection. Customer's QC gave these parts OK. But their engineer rejected the part. He wants the diameter to have 3 microns straightness and roundness even though there is no callout at all and the diameter tolerance is alot wider than that. I stood my ground and I told them to make revision to their drawing and I would quote it again. The engineer doesn't have authority to make a new design because it came from their oversea headquarter. He still insists on his tolerance though.
Enough ranting for now
How are you guys doing?
I have been gaining new works from both old and new customers this past year, so I have been doing alot of sample pieces for them before we go into production. This week, there are 2 cases of rejects from 2 different customers, both are repeat customers.
Case #1 - The sample parts were rejected due to threaded holes being "too loose". They checked with Go NoGo gauges just like I did and they passed the gauge inspection. However, they said they think there is too much slop even if the NoGo gauge can not go in. Well, isn't the point of Go NoGo gauges so you don't have to use your judgement?! What worse was that they cut the part to see the cross section of the thread and saw that the threads were not pointy because I used a roll tap, which they have no idea what the process is. I explained the technical to them and showed them videos of thread rolling. They still didn't care and proceeded to blame the thread rolling process for the "loose" thread. Now, how am I going to measure the threads if I have to go by their "feel"?
Case #2 - This is a very simple pin part. The diameter tolerance is not difficult to machine at all. The part was machined on a cnc lathe and passed all the inspection. Customer's QC gave these parts OK. But their engineer rejected the part. He wants the diameter to have 3 microns straightness and roundness even though there is no callout at all and the diameter tolerance is alot wider than that. I stood my ground and I told them to make revision to their drawing and I would quote it again. The engineer doesn't have authority to make a new design because it came from their oversea headquarter. He still insists on his tolerance though.
Enough ranting for now
How are you guys doing?