few newbee questions

[njtermite]

Hello all, first off I’m new here and new to cnc. I wanted to get something fabricated that I am making in Rhino. I want it to be made out of plastic would a cnc or rapid
prototyping machine be able to do this. The link below I have two model pic examples. Pic1, my question is, is the machine able to cut a shape like this and give the sides a radius? For pic 2 you will see my screw hole things (don't know the right term for it) how would they make the threads for the screws? Do I have to model the hole threads as well, or do you usually tell them the screw size that will go there and they drill the threads from that?

http://www.hightechsolutions.us/misc/cnc.html



One more question:
Also about how much does it cost to get something fabricated?

Thanks,
Mark

[njtermite]

Was this the right spot to post this question, if not could someone point me were to post it?

Thanks,
Mark

[buscht]

I cannot tell exactly what you want to do from the drawings and your descriptions.

Your part looks to be some kind of shell, with 4 stand offs that are tapped.

What size is it? If the part is 12" x 12" x 2" for example, I'd say that it could easily be rapid prototyped. The problem is the cost, anywhere from $1000 to $5000 I'd guess.

It can be milled out completely on a CNC. Usually the holes are drilled and hand tapped on something like you show, but they can be tapped on the CNC.

Another low cost option would be to mill a mold out of wood and build a vacuum form press.

http://www.halloweenfear.com/vacuumformintro.html

The tapped standoffs would be made seperately and glued in place.

It really depends upon the part size, but its pretty expensive to get these parts made (prototypes) in a professional job shop.

[Rekd]

Is that a guitar body? It looks hallow in the right view. If it's hallow, it will be considerably more expensive. If it's just the body, that can be machined for under a few hundred dollars at the right shop.

'Rekd

[njtermite]

The pics were just an example; I’m still working on the main model that will need to be fabricated. It will be a shell/hollow like that with fillet edges. its going to be around 15” *12” *3”. It’s for a hobby electronic project I’m working on. It will be the casing for the electronic components. I’m trying to find a cheap way to does this, I was thinking I would be better off with plastic, but would doing it a different way be cheaper? Like with metal, is there any way or any tips of making a hollow case with fillet edges like that my self at home for a prototype?

Thanks,
Mark

[buscht]

http://www.freemansupply.com/video-casting.htm

There are quite a few places that sell casting supplies for exactly what you want to do.

CNC isn't required, but it might allow you to make a more accurate model to use for your molds.

[njtermite]

Thanks for the link and information, any recommendation on what material I should use to make my model with for making the model? If I print out my prints and then cut out a solid model from wood, would the wood be all right to use for making the mold?

Thanks,
Mark