modelling injection moulding

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  10 October 2012
modelling injection moulding

I have a yogurt pot to model and I'm not sure how to do it. It's a cup with a lid, the cup is fluted like a cupcake, the lid fits over this and is smooth. I've modelled these bits with splines and loft nurbs, which are then put in hypernurbs and it's all looking good.

I now have to model a flat circular area on the side of the pot that will have a printed sticker applied to it, this circular area will have to be 'pulled' out of the existing model, half of the circular area being pulled out of the lid and half out of the fluted bottom.

What's the best way to do this? Should I project a circle spline onto the mesh to start?
 
  10 October 2012
Can anyone help with this? Got a nice PM with some tutorial links, but still can't seem to get anywhere. Attached is a pic of what I'm trying to model. It's all fine except I need the intersection between the cylinder and the lid and base to be chamfered.
 
  10 October 2012
I appreciate that you're after a solution for C4D but to do this with a proper fillet I'd only consider using a NURBS modeller such as Rhino.
 
  10 October 2012
This is a difficult thing to do if you just started modeling, but doable if you through yourself in.

you need to do poly editing from here on i guess no splines with lofts and so on.

Project a circle spline (with enough spline points) onto your mesh and the i would use this as a visual guide where to cut and subdivide the polymesh to have a clean rounded intersection.

It will be crucial how many subdivisions your circled sticker area will have to fit nicely on the fkutet part.

I guess you will need 2-3 attempts to achieve a clean mesh.
save your file incremental to go pack and do it again if you run into problems.

kind regards mogh
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  10 October 2012
I tend to agree with Darter. If you want to send me your model as a guide, I could knock you something out of Moi3d and export a polygon version to use in Cinema, shouldn't take long. Mogh's method also works but it's a fiddly build compared to a nurbs solution.
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Rich
http://www.loopcorp.com
 
  10 October 2012
Sometimes, if I absolutely need an sds version of a model like this, I'll build it in Moi to get it made accurately and retopologise in something like Modo. Much faster than trying to predict where to slice the mesh to get a clean boolean-looking result.
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Rich
http://www.loopcorp.com
 
  10 October 2012
Thank you so much everyone. Loopcorp, that's a very kind offer. I'm not new to modelling, but I have long gaps between c4d jobs, and so I'm a bit out of practice. I think the client on this occasion will settle for a hard edge where the cylinder comes out of the cupcake and lid. Waiting to hear back from them.

Now I have another question - see my new post!
 
  10 October 2012
ZBrush would also be an option for something like this.
Pros: Quick, clean bevels
Cons: High poly count

cheers
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  10 October 2012
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