I hope this is as simple as I think it is. I have a part the calls out the true position of a 5/16-18 ID threaded hole with MMC. I think that the MMC should come off of the minor diameter. Onr of the owners and the QA manager think it should come off of the pitch diameter. Other than the fact we don't have a good way to measure the pitch diameter in house I think they are wrong. What are the prevailing winds on minor or pitch for MMC on a ID threaded hole?
If you ABSOLUTELY MUST - Pitch diameter of threaded holes CAN be obtained using flexbar reprorubber and casting it. Can be dificult to remove if not released properly ar if you don't add a key handle to help. But, as a rule I do not put MMC on threaded holes. Way to expensive to measure and the bonus values are so low. No return on investment.
If you ABSOLUTELY MUST - Pitch diameter of threaded holes CAN be obtained using flexbar reprorubber and casting it. Can be dificult to remove if not released properly ar if you don't add a key handle to help. But, as a rule I do not put MMC on threaded holes. Way to expensive to measure and the bonus values are so low. No return on investment.
