Q
qcchick
I am I silly for requiring the Total Runout be checked 100% on a new build prototype of a welded assembly? The assembly has many variables that contols cannot be determined in a single build cycle. Due to the complexity of the welded assembly and the fact that the runout tolerance is critical I feel it should be checked on each part. There are only 36 pcs. I am having a hard time conveying this point to one of our new engineers who thinks that if we build one part that "in theory" the next one will be exactly the same. (booksmart with very little practical experience). I feel if we can ensure that in the first build we are meeting the runout requirement that then we can establish process contols and decide on a sampling size for future builds. This assembly involves welding a rectangluar part that consists of 2 seperate parts with 2 welded inserts that hold a machined shaft. The shaft mounts to a bearing and the whole assembly will spin. The total runout tolerance is only .030" which isn't much granted the variables that could occur in the manufacutring process. Just would like opinions on how I can convey this properly with tact. This person's opion is that we should only have to check it one time and if it is good then the rest will also be good. (If it was that easy we wouldn't need process controls right?)