Fitted box design generator underway

(William Adams) #1

I’ve been working on one for a while — has a few options:

Detail view:

If someone would like an STL — just let me know what dimensions you’d like to cut, what features, and so forth and I’ll try to work one up and post it.

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(William Adams) #2

Round, 3" x 3" x 1" with lid and divider:

cncboxfitted_round_3x3_lid.stl (874.2 KB)

cncboxfitted_round_3x3_bottom.stl (563.6 KB)

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(William Adams) #3

And here’s an animation which shows some of the options and parameters:

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(William Adams) #4

Okay, bought a nifty mechanical pencil and an assortment of leads:

and while the pencil fits neatly in a slot in my bag, mislike the pencil lead boxes rattling around loose (and worry about breakage or loosing them), so we need to make a box.

Fortunately, the lead cases are shaped so that they nest efficiently:

so we just need a box with a single pocket which is: ~7.25mm deep, ~56.5mm at its widest and ~76.75mm tall (probably we’ll swap those two numbers)

We have some bamboo flooring stock (this is wonderfully convenient for small projects — just buy some samples at a big box store), so we’ll use that.

First, we load up our OpenSCAD program…

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(William Adams) #5

Entering the parameters is complicated a bit by having to do the math to get from pocket dimension to box dimension (need to look into calculating and display those), but with a bit of effort we arrive at:

which seems pretty workable.

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(William Adams) #6

Until we try to load those settings into lualatex and we find out that the numbers when in metric exceed some limit…

a little bet of editing of the file and some conversion math and we arrive at:

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(William Adams) #7

which with a bit of adjusting arrives at:

5

which loads into Carbide Create and allows us to set up appropriate toolpaths.

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(William Adams) #8

and with suitable toolpaths previews as:

(which isn’t quite right — needs to be in two separate files with suitable thicknesses, or have a pocket to thin the lid down to the right thickness — hang on)

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(William Adams) #9

Here, something like this:

Attached.
cncboxfitted_2.375x3.5x0.5.c2d (224.3 KB)

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(William Adams) #10

Starting in on a web page on this at: https://wiki.shapeoko.com/index.php/Design_into_3D:_box:_fitted

Fitted boxes are the easiest to make on a CNC — just two pocket cuts, one rabbet, and two profile cuts.

For a round box, the needed parameters may be as simple as:

  • diameter
  • thickness of the box bottom and lid
  • thickness of the wall of the box
  • width of the rabbet cut

Note that that last determines the size of the pocket of the lid, and should be adjusted by the tolerance needed to allow the lid to fit properly.

Designinto3d box fitted round 2x2 screen.png

The file for cutting this is simply a series of nested circles of appropriate dimensions:

Design into 3D box fitted round 2x2.svg

Given a 13.5mm thick stock, a 4.5mm thick bottom and lid, a 3mm tall lip, and using a 1/4" (6.35mm) endmill necessitating an 8mm or so offset geometry so as to cut the perimeter as a pocket rather than as a slot one would arrive at the following toolpaths:

Design into 3D box fitted round 2x2 cc toolpaths.png

which preview as:

Design into 3D box fitted round 2x2 cc preview.png

Carbide Create source: cncboxfitted_round_2x2.c2d (170.0 KB) — please adjust feeds and speeds as needed, as well as the rabbet for the lid as need be.

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(William Adams) #11

The wiki page has been updated with some photos and the Carbide Create source files for this posted to:

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