MechLurker
Mechanical
- Sep 6, 2019
- 1
Hello I am currently designing a cap that fits over a threaded cylinder. Due to certain limiting conditions the cylinder diameter can only be so large.
here is link with the description of the problem below:
Image Of Issue
Currently the cylinder's outer diameter is 26.77mm with an inner diameter of 25.28, This leaves a wall thickness of 1.49mm and we have to cut standard 0.4375(inch)-20 threads cut into it, leaving a minimum wall thickness of 0.8mm after the threads have been cut. It threads into a cap, both parts are 300 series stainless steel, the product is a consumer stainless water bottle, besides compressing o-rings to seal the bottle, the cap does not experience intense pressures. I have attached a link so you guys can see, ignore the space between the cap threads and cylinder threads, I don't want to waste time modelling until I solve this question.
My question is does this wall thickness give enough meat for the cap to hold on to and not break down the line? Is 0.8mm minimum wall thickness too thin for these threads in stainless steel? I have seen rules of thumb for fastener design where as long as you give the same thickness to wall as the fastener is wide you are ok, but obviously this can't apply to cap design where I have such a wide cylinder and cap.
Thank you in advance for your time!
here is link with the description of the problem below:
Image Of Issue
Currently the cylinder's outer diameter is 26.77mm with an inner diameter of 25.28, This leaves a wall thickness of 1.49mm and we have to cut standard 0.4375(inch)-20 threads cut into it, leaving a minimum wall thickness of 0.8mm after the threads have been cut. It threads into a cap, both parts are 300 series stainless steel, the product is a consumer stainless water bottle, besides compressing o-rings to seal the bottle, the cap does not experience intense pressures. I have attached a link so you guys can see, ignore the space between the cap threads and cylinder threads, I don't want to waste time modelling until I solve this question.
My question is does this wall thickness give enough meat for the cap to hold on to and not break down the line? Is 0.8mm minimum wall thickness too thin for these threads in stainless steel? I have seen rules of thumb for fastener design where as long as you give the same thickness to wall as the fastener is wide you are ok, but obviously this can't apply to cap design where I have such a wide cylinder and cap.
Thank you in advance for your time!