I need help on the threads on a plast part. i can make the threads but is there standards for the actual shape of the Threading? I am also having problems finishing the start and ending of the threads. Can anyone send me examples of how to do this?
My boss told me that what they'll usually do is cut the threads into an EDM tool and sink that into the mold, so it's possible to just spec the thread region with a unified thread callout and let the mold-maker handle it.
How if you're doing something like a shampoo bottle where you have a a big sloppy pitch you can use an acme thread profile but there's probably no standard for this.
Yes, there are standards for thread shapes. The Machinery's Handbook has all the standards, and a LOT more.
If this is for a container finish (cap on a bottle/jar) then most of the inudustry uses SP finish specs:
Well, I'm happy to be wrong about this.
John Burrill wrote: Well, I'm happy to be wrong about this.
John Burrill wrote:
On the other hand, I can't find the actual standards. They may be orphaned.
Dwight, these are the specs I use... they're quite comprehensive.
Those look good.
Thanks for everyones help
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