Graphics Programs Reference
In-Depth Information
can use the Click to Add function and add the special face and a unique thick-
ness for it to the list. You can add multiple faces and, in theory, hollow out a
part and give each remaining face a different thickness.
The More Tab
Sometimes you may have diffi culty getting a shell to calculate. The More tab
offers several workfl ows that should help you get the part to shell.
Allow Approximation
This option is on by default. Optimized shelling creates the shell quickly; but in
order to do so, it allows infi nitesimally small variations in the thickness. In all
but a handful of cases, this shell is more accurate than most people need. If you
require extreme accuracy, you can deselect this option:
Mean This approximation allows the thickness to vary and be either slightly
thinner or thicker than the Thickness value.
Never Too Thin If the shell thickness is critical, this option allows the variation
to be thicker — but never thinner — than the specifi cation.
Never Too Thick With this option, the shell can be thinner than the callout but
not thicker.
Specify Tolerance To allow deviation but limit it to a tolerance, you can specify
a value along with the solution. Doing so can add time to creating the shell; but
in cases where you must be sure, this is the way.
When I approach a multibody part, I create as many features as possible that
will be common to all (or many) of the parts before dividing the part.
Shelling the Part
The last common feature of the parts is they all have the same wall thickness:
1. Start the Shell tool from the Modify panel.
2. Select the four internal faces (Figure 8.6), and set the Thickness
value to 0.1 inches.
3. Click OK to calculate the Shell feature.
4. Save the part.
Now. it's time to separate your part into two.
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