I would like to make a female thread in a block of aluminum to accept the male thread of a 2 liter Pepsi bottle. The male thread appears to be 1.080" at 10tpi. Any recommendations. Thanks Paul
Make a female thread for a 2 liter Pepsi bottle male thread
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No real advice.
I am always surprised, though I don't know why I should be, how few threads are involved in many items like those bottles, few threads, don't look really precise, not even complete helix/spirals. Came across one food stuff bottle the other day that was far more cut away, the thread was interrupted around the point of the thread, than thread and even then no issues doing its job.
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The threads are standardized by the International Society of Beverage Technologists.
They have detailed specs available in PDF format. Take a look at http://www.bevtech.org/threadspecs-downloads.asp
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I did this recently, to make stomp rocket launchers for cub scouts. The bottle is the bellows, and after 10-15 stomps they break. The scouts can screw the bottle on and off themselves without help, instead of the old units which used duct tape to attach the bottles.
Anyway, about 8-10 years ago, most US beverage makers changed from imperial to metric threads. They are now 27.4mm OD and the pitch is 2.7mm. I had to setup a compound gear set on my lathe to make that pitch.
allan
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Originally posted by RussZHC View Postnot even complete helix/spirals. Came across one food stuff bottle the other day that was far more cut away, the thread was interrupted around the point of the thread, than thread and even then no issues doing its job.Location: North Central Texas
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Bottle threads, yeah, I've cut some on the CNC mill.
An inventor had me make a prototype which was basically a short piece of plastic tube with female bottle threads on both ends. The tube was meant to screw two ketchup bottles together. The idea was that a near empty ketchup bottle could be connected vertically and drained into a full bottle so the last bit wasn't wasted. Not a bad idea, although who knows what the market would be. He dropped the idea just as he was about to have an expensive injection mold made when the ketchup company changed their bottle threads.
Another time I made replacement upper gas tank filler necks for vintage International Scouts. The factory original gas caps leaked when the vehicles were on steep inclines. By adapting a Toyota PU gas cap it cured the leaking gas problem.
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Can't get that bevtech.org one to load, not sure if this one is the same thing:
bit OT, articles illustrate stuff I would never have thought, reducing the overall height of a bottle cap and putting the threads further down, saves dollars as less plastic is used, shipping costs per unit as more units fit in the same space etc., I gotta learn when to think in the millions and millions of units.Last edited by RussZHC; 03-02-2016, 10:54 PM.
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Originally posted by kitno455 View PostI did this recently, to make stomp rocket launchers for cub scouts. The bottle is the bellows, and after 10-15 stomps they break. The scouts can screw the bottle on and off themselves without help, instead of the old units which used duct tape to attach the bottles.
Anyway, about 8-10 years ago, most US beverage makers changed from imperial to metric threads. They are now 27.4mm OD and the pitch is 2.7mm. I had to setup a compound gear set on my lathe to make that pitch.
allan
measuring a fairy tale thread in mm doesnt make it metric
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Originally posted by janvanruth View Postmeasuring a fairy tale thread in mm doesnt make it metric
If it's a "bastard thread" the spec could be set to funny numbers in Metric or Imperial so unless there's an obvious conversion it's actually impossible to say whether it was dreamed up in Imperial or Metric
- NickIf you benefit from the Dunning-Kruger Effect you may not even know it ;-)
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Originally posted by spindowner View PostI would like to make a female thread in a block of aluminum to accept the male thread of a 2 liter Pepsi bottle. The male thread appears to be 1.080" at 10tpi. Any recommendations. Thanks Paul
- NickIf you benefit from the Dunning-Kruger Effect you may not even know it ;-)
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