Which program can make irregular depth pockets?

RoguePirin
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Which program can make irregular depth pockets?

Post by RoguePirin » Thu Oct 22, 2015 1:57 pm

Hello,

I have a friend who plays role playing games a lot. He has asked for a wooden holder for his dice. The dice are a mixture of several different faceted solids:
rpg-dice-set.jpg
Example of dice
rpg-dice-set.jpg (54.98 KiB) Viewed 713 times
I want to make a base for the dice that has a pocket for each die, where each die sits halfway down into the base. When I search for "polygon pocket", I get plenty of results on how to make a single depth pocket, whose walls form a polygon. What I am looking for is a way to design a pocket that is not of uniform depth, but instead has each pocket mold around the die (as if the base was made of clay and I just pushed the die into it).

I am brand new to CNC, and my SO3 is not yet up and cutting, but I wanted to get started on the design while I can. I have found 3D models online (in STL format) for each die shape (except the 10 sided die). I was hoping to import each 3D model into a software program, set it half-way down into the material, and get a proper irregular depth pocket tool path generated.

I am asking you all if you could help point me in the right direction in terms of which software programs can do this, and which feature of that program I would focus on. It doesn't have to be a free program (I am looking at V Carve Desktop once I am up and running), but free is always good.
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Fablicator
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Re: Which program can make irregular depth pockets?

Post by Fablicator » Thu Oct 22, 2015 2:20 pm

Autodesk Fusion 360 has this ability, and can generate the tool paths relatively easily. I would go with a 3D machining strategy with a 1/8in ball end mill.

This video sorta gives you and idea of what is involved. https://www.youtube.com/watch?v=XYoovemQoiM

WillAdams
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Re: Which program can make irregular depth pockets?

Post by WillAdams » Thu Oct 22, 2015 2:22 pm

There was a recent such project posted to reddit: https://www.reddit.com/r/shapeoko/comme ... _dice_box/

In order to make irregular pockets, you have to define the shapes using a 3D CAD / modelling program: http://www.shapeoko.com/wiki/index.php/CAD#3D

Then you'll need to subtract them from your stock / design (using the same program, or if need be a different one).

Then you'll need to do CAM: http://www.shapeoko.com/wiki/index.php/CAM#3D

A good commercial option for this is MeshCAM, others are listed at: http://www.shapeoko.com/wiki/index.php/ ... are#3D_CAM (also see 3D CAD higher up on that page).
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cvoinescu
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Re: Which program can make irregular depth pockets?

Post by cvoinescu » Thu Oct 22, 2015 3:02 pm

Here are a plethora of polyhedra with OpenSCAD models. Those should help model the cavities accurately.
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RoguePirin
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Re: Which program can make irregular depth pockets?

Post by RoguePirin » Thu Oct 22, 2015 3:23 pm

Fablicator wrote:This video sorta gives you and idea of what is involved. https://www.youtube.com/watch?v=XYoovemQoiM
Thanks, I have to watch it after work.
Shapeoko 3 #677, Nyloc nuts, ¾" HDPE base with t-nuts, Dewalt 611 w/Super PIDv2

RoguePirin
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Re: Which program can make irregular depth pockets?

Post by RoguePirin » Thu Oct 22, 2015 3:25 pm

WillAdams wrote:There was a recent such project posted to reddit: https://www.reddit.com/r/shapeoko/comme ... _dice_box/

In order to make irregular pockets, you have to define the shapes using a 3D CAD / modelling program: http://www.shapeoko.com/wiki/index.php/CAD#3D

Then you'll need to subtract them from your stock / design (using the same program, or if need be a different one).

Then you'll need to do CAM: http://www.shapeoko.com/wiki/index.php/CAM#3D

A good commercial option for this is MeshCAM, others are listed at: http://www.shapeoko.com/wiki/index.php/ ... are#3D_CAM (also see 3D CAD higher up on that page).
The reddit post just makes single depth holes, not irregular. But your term "subtract them from the stock" is something I will look into. I will check out the CAM programs and see what I can find.

Thanks.
Shapeoko 3 #677, Nyloc nuts, ¾" HDPE base with t-nuts, Dewalt 611 w/Super PIDv2

RoguePirin
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Re: Which program can make irregular depth pockets?

Post by RoguePirin » Thu Oct 22, 2015 3:28 pm

cvoinescu wrote:Here are a plethora of polyhedra with OpenSCAD models. Those should help model the cavities accurately.
Thanks for the resource. I see that they even have the shapes with an a.k.a. for dice. Unfortunately, they don't have a 10-sided die model. I have all the others, but this site is a great resource that I will bookmark for the future.

EDIT: By the way, I got my models from GrabCAD.
Last edited by RoguePirin on Thu Oct 22, 2015 6:41 pm, edited 1 time in total.
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cvoinescu
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Re: Which program can make irregular depth pockets?

Post by cvoinescu » Thu Oct 22, 2015 5:21 pm

Unfortunately, the 10-faced die isn't in any of those classes of special polyhedra. But you can model it as the intersection of two pentagonal pyramids, one of them upside down and rotated 36 degrees. OpenSCAD can make those pyramids simply by asking for a cone with five segments ($fn=5 -- works for any number higher than 5 too. A cone is a cylinder with r1=0.) With all the other dice, the shape is fixed and all you need to know is its size; with the 10D, the slope of the pyramids is arbitrary, so you'll need to match your existing die (actual dice do vary).
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RoguePirin
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Re: Which program can make irregular depth pockets?

Post by RoguePirin » Thu Oct 22, 2015 6:45 pm

cvoinescu wrote:Unfortunately, the 10-faced die isn't in any of those classes of special polyhedra. But you can model it as the intersection of two pentagonal pyramids, one of them upside down and rotated 36 degrees. OpenSCAD can make those pyramids simply by asking for a cone with five segments ($fn=5 -- works for any number higher than 5 too. A cone is a cylinder with r1=0.) With all the other dice, the shape is fixed and all you need to know is its size; with the 10D, the slope of the pyramids is arbitrary, so you'll need to match your existing die (actual dice do vary).
Thanks for the detailed response. It's interesting that the 10-sided dice will vary between sets; I have seen that some sets come with smaller 6-sided dice.
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cvoinescu
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Re: Which program can make irregular depth pockets?

Post by cvoinescu » Thu Oct 22, 2015 7:41 pm

RoguePirin wrote:I have seen that some sets come with smaller 6-sided dice.
Yes, but they're still cubes with 90 degree angles and everything. The 10-sided die doesn't even have to be the exact same shape: it can be made shorter or longer, effectively stretching it in the direction of the two five-faced points.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

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