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How to Easily Reverse Engineer Threads
Here's a great piece of physical problem-solving: Let's say you've got the absolutely perfect threaded female part, but the corresponding male part leaves a little something to be desired. You'd like to create your own male part, but it's impossible to measure the interior threading on the female part and you can't track the manufacturing info down.
Enter a caption (optional)Here industrial designer Eric Strebel shows you how he reverse-engineers the threads using commonly available materials:
Enter a caption (optional)-
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Very clever!
That is not the correct way at all and a bad example of teaching younger or inexperienced designers how to create threads on a bottle or closure. There are specific SPI thread design guidelines that you can find on-line. Refer to Joshua's links.
You assume that the threads in the cap were built to some sort of a standard...Maybe they were and maybe they were not...It was not relevant since that was not required due to the nature and time constrains of the project. It was simply about reverse engineering the existing and adapting to that.
The above should help people create functional neck/threads for finishing bottles. No sense in starting from unknown in this department.
Good resource. Also many CAD applications have this stuff built right in.
Seriously, get some moldable plastic aka polymorph aka polydoh etc. It is a plastic that turns into playdogh like consistency when placed in hot water, but hardens to a rigid plastic as it cools. Its reusable, it can be colored to any color you want, dirty cheap. Its like sugru, just 100 times better, as it comes in bags and jars and not little sugar packet size.
Cool, sounds like a good idea. Thanks