Quote Originally Posted by Toolmaker51 View Post
The new math, where 12 can be odd!

Regarding proprietary threads; a few come about through practice of 'design for manufacturing'. A lot of measuring tools have this, they sought a certain degree of thread engagement [or movement per revolution] not offered in standards like NC or NF. Included here, the continued use of old drawings and equipment. The replacement part was seen as a side benefit; being that historically the era's products outlast anything offered later.
I have spent the better part of 3 years now on a project that I have redesigned tested found areas which could be improved by making a few changes while said changes often created other issues which had to be addressed. As much as I prefer to use off the shelf items in an assembly whenever possible there are times when nothing of a standard stock item exists in the size or shape, I require. Or if it does the level of quality is so sadly lacking or the cost is prohibitive, unless I import it. I don't have a problem with using imported stuff from most countries around the world as long as their products meet my standards.
I would actually prefer to use all metric materials if that were even possible. But just try and purchase sheet and formed structural materials in steel or aluminum in this country at any kind of reasonable price let alone considering availability. Si if I cannot use metric everywhere I chose to use metric nowhere the exception being bearings as those have been metric standard for decades around the world, bearings in imperial inch dimensions are the difficult to find things.
I have 4 requirements I insist on in my design criteria #1 strength and durability #2 Ease of manufacture from a production standpoint #3 aesthetically pleasing for marketability #4 cost of manufacture. However, this particular project does carry a 5th requirement the least amount of weight reasonably possible. My partner the bean counter would re arrange these priorities if I would let him