How to design moving parts

[Ama-fessional Molder]

I know a lot about material properties actually. I did say it could be done in theory.

[curious aardvark]

ah yes but you're still thinking about existing materiails and technology.

It's the difference between 'proper' science fiction and the stuff where they use existing technology and try to write modern science based fiction. The only person who's ever consistently pulled that off is michael crichton.

Given the ridiculous leaps in un redicted technology in recent years, us imaginative sf writers probably have a better chance in getting a prediction right.

[Ama-fessional Molder]

1. Clearance is very important when designing mechanical parts for 3D printing.
2. Parts have to be cleaned also. You must allocate space for this. 3d printing service delhi-NCR bangalore
3. Powder is trapped in enclosed spaces. If you do not design so that it can be removed your part will not work.
4. Two surfaces(printed in the same orientation) that rub against each other cause more friction than one would expect due to the layerwise production in 3D printing("hooking").
5. If you design some kind of mechanical device such as a coil spring please keep in mind that since it is produced in an integrated fashion(ie part of the housing) there is no(or not much) pre-load in the spring. It will be weaker than a traditional spring made out of two parts and then compressed in the housing.
6. Paint changes the mechanical properties of your model.
7. You could manually correct your model with a file but this is tough going.

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This... is a really good post.

Nice work.

I would only clarify number 3, in the case of FDM there is no powder but the same still applies, support structure material must be able to work it's way out of the joint or it will bind up in operation.

Number 5 is especially nice. Not something most people consider, spring preload is the difference between a sagging part and a nice high quality function that feels solid.