No, PST doesn't always resolve problems satisfactorily

krazykuda said
How were the shafts engineered/designed??? Did you reverse engineer them or get a hold of blueprints for the k-frame and design to those???
If reverse engineered, how do you know if the part that you used to design to was built to nominal and not at one end of tolerance or the other????

What quality control checks do you have in the process??? How often are the parts checked??? How do you check them, attribute or variable gauges???

Do you do SPC??? How capable is your process??? What are your Cp and Cpk numbers??? How do you quarantine out of spec parts???

Yes the part was originally reversed engineered from a mopar new old stock pivot shaft. The parts were sent out to an engineering firms that we have worked with for a numbers of years on many of our projects. During that time they drew up the plans for the part ( with tolerance) as well as the data file for the machine shop that we use. Also during that time they tested the metal that the NOS shafts were made of for hardness then determined the best modern metal to use (4140). As for the QC of our product, these are made in small runs 100. When the product comes in it is in bulk packaging a sampling of 10% of the product is pulled and checked against the blue prints and physical hold samples to make sure there is no issue. If no issue is found the product is packaged in pairs and stocked. If we find product that is out of spec we do not quarantine it as we do not want the risk of it making it back into stock. The items is either shipped back to machine shop for credit against new orders or per the machine shop discarded.

If a customers calls with an issue we do the same thing in our QC process meaning 10% of the product in stock is pulled and checked against the blue prints and physical hold samples to make sure there is no issue. If no issue is found we relay this info back to the customer and at that point is when we asked that the product be sent back to us for evaluation which was done in this case. But in this customers case we could not find a physical problem with the shafts once we received them back they matched the blue prints and hold sample.

Thanks
James From
PST Marketing