Post form of a living hinge as a joint

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The discussion revolves around creating a living hinge joint with specific dimensions, including a hinge length of 220 mm and an inter radius of 1.8 mm. Participants express confusion about the dimensions and the feasibility of the design, particularly regarding the material choice for the hinge. There are suggestions to consider using ultrasonic welding for the hinge formation and to clarify the design with dimensioned sketches. Additionally, the thread title is critiqued for clarity, with requests for a more descriptive alternative. Overall, the focus is on resolving the technical challenges of designing and fabricating the hinge joint.
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Hi

I have a scenario where I just cannot make up my mind when creating this joint and hinge at the same time.

Obviously yellow is the hinge, red section to the left has two wings hanging off it held there by two hinges, 250 um.

thinking about ultra sonics to weld this or form the hinge and weld at same time I should say. The hinge length is 220 mm and the inter rad of the hinge is 1.8mm.

The stumbling bloke is how do I introduce the material for the hinge, especially when I consider the idea of a softer PP than what is used on the larger parts. Rigidity on the larger parts is imperative.
 

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mikesydwest said:
The hinge length is 220 mm and the inter rad of the hinge is 1.8mm.
I must be missing something, as I find that combination ridiculous. Did you mean the width is 220mm? With a 1.8mm radius turn, 220mm would wrap around it about 10 times
 
ridiculous hmm , the length of the hinge is 220mm long, the width is 3mm in a 45 deg ark at approx. 1.8 mm rad, think about it, its not ridiculous. please do not be rude I just look for help not ridicule.

did you look at the images, hinges do not wrap around them selves
 
the yellow part is a short piece of the hinge, its 5mm long in this image - it is 220 long spanning the length of the part
 

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mikesydwest said:
please do not be rude I just look for help not ridicule.
I SPECIFICALLY said I must be missing something.
 
cool
 
Welcome to the PF. :smile:
mikesydwest said:
Obviously yellow is the hinge, red section to the left has two wings hanging off it held there by two hinges, 250 um.
mikesydwest said:
The hinge length is 220 mm and the inter rad of the hinge is 1.8mm.
mikesydwest said:
the length of the hinge is 220mm long, the width is 3mm in a 45 deg ark at approx. 1.8 mm rad
I'm also having the same problems understanding these dimensions like @phinds is. Do you have a dimensioned sketch of what you are trying to do?

Also, what material do you want to use for this "hinge"? Can you just use fabric? Or does it need to be some special material?

And I'd like to try to fix up your thread title a bit to help your thread get more views. I'm not able to parse what you are saying in the current title below -- can you think of an alternate title that may explain better what you are asking? What is "living" here? Thank you.
Post form of living hinge as joint
 
its all good thanks, sorry to make a nuisance
 

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