Plastic Component Moulding

How would you think to do it? What plastic would you use and why? Knowing these things, how would you set up production?

Hello? Do you not have answers to these questions? No? Then here's what you need to do: call a company that does injection molding and tell them what you need.

Do you have any technical background at all, or are you in management?

I think our Poster has just managed to describe the perfect 'Widget'! The defined shapes either side of the undefined flexible centre section produces a movement/bulging action when a small amount of pressure is applied. Beautiful, just beautiful, sounds like a medical condition!

I fully agree with you. If I find post is confusing or silly, I simply do not comment. Why to hurt innocent OP.?

BaldSprinter, being a longtime member you should recognize that many Anonymous Posters are, indeed, people looking for homework help or are simply attempting something far beyond their abilities.

You should also recognize that some of us don't suffer fools well (some not at all), and some level of active participation from a poster is expected for a cogent response to be offered.

So, if you can help us out with some of this interaction I believe that some members will come forward in what can only be described as a shining moment in CR4 history... or maybe not, I don't know.

I believe lyn has the answer in two shot molding. More info from you will help.

Hi BS,

Well, I won't apologise for my tone. It was not meant to be insulting or obnoxious, but to elicit a response. I know that it is a shot in the dark because APs don't get automatic emails, so they don't know if anyone has replied to their Original Post (OP).

Note that OP AP (or maybe OAP) has not been back.

The biggest problem here, is that, by and large, OPs do not give enough information for what they are asking.

I used to have kind of thin skin when I first started here. It gets better the more you get involved.

Mike

Hi Anon

I would like to apologise for rudeness of two previous posters, what they said is valid, but not how they said it.

When plastic stays deformed is tends to set in that position after a period of time, so plastic springs only work when in their normal situation, they are fully released. You can mold in a metal spring to get around this.

Tony

Sorry if I offended anyone.

But you DID NOT .

You told the honest Truth.

mm

Lyn is as technologically spot on as it is likely to get - so GA for that.

As for 'offended', the OP is totally vague as to the application;

One could just as easily read the OP as a dual durometer extrusion situation, as a button on an electric tooth brush.

No actually meaningful/useful answer is possible to this 'question', past what Lyn said.

So Frustration may lead to the odd 'dig' - call it the 'price of a correct answer'.

This is vastly different from those who abuse the OP because they don't have the knowledge, or expertise, or language skills, to understand what the OP is asking.

It doesn't bother me in the least that I was called to task by BaldSprinter, and others. He is entitled to his opinion, as is everyone else here. For me, I think that the rebuke that I gave the obviously uninformed OP was rather mild.

What really bothers me is the fact that some people come here to ask us how to do their jobs for them. This OP may well have been given an assignment that he is incapable of performing competently. Pity the poor client if this is true. This may, or may not, be the case here, we'll probably never know.

Some explanation of the OP's level of education and experience in the field of injection molding would have helped understand the motivation for the question. Knowledge cannot be infused into one's brain. It must be assimilated, slowly, over time.

I have no tolerance for lazy people. I will try to help those who show that they have a legitimate technical problem and need help with it. I won't do your homework for you, and I won't do your job for you. I've never asked anybody to do either for me, and I expect the same courtesy from those who come here.

Thanks for the support of those of you who came to my defense.

Given the fact that I am, to say the least, an infrequent poster I may not be as annoyed as some of you may be at the phraseology of the guests. Having 18 years of experience in the manufacturing industry as an engineer then owner I find myself qualified to comment on a variety of topics. And still when I ask a question of my peers on something I am unfamiliar with I don't feel as if I am asking them to do my homework for me. So for those of you who feel you are above those poorly worded questions, please feel free to go back to college and teach because those are the only clients who will truly appreciate you.

Additionally, (Given the information at hand) I would use a single injected molded thermoplastic an use machining to create the flexibility in the center of the component in question.

Using your (incorrect) approach, why not just mold the part to the final shape? Why would you have to machine anything?

The information at hand calls for "movement/ Bulging action".

Maybe the OP can elaborate.

There is a limit to the complexity of a design that a mold can produce however, when using a cnc machine, the sky is the limit when it comes to final configuration. I have seen two-part bonding fail even using two exact durometer matches under the slightest of pressure. All the while the company doing the injection molding tells me it can't delaminate. ( hands on, real world ) It finally came down to a cost issue on their part. Incorrect, I think not! Have you ever done this? So how are you suggesting it be done?

Since we don't really know what the intent of the OP is it is useless to continue this meaningless debate.

What two part bonding? You would make the part out of a single material, I thought. I've molded some very complex parts that didn't require any post mold machining. I don't know what your area of competence is, obviously it's not injection molding.

Neither of us believes the other has a clue. I'm done with you.

Agreed, bickering is useless. I will remain in the real world and leave you to be sovereign of your cube.

Lyn said it all.

Let us close it.