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How to make a 3d tetrahedron array

I'm trying to make a 3d tetrahedron (4 sided pyramid) basically.  I am starting with a hollow cylinder and want to create an array so that in the end I've got 4 cylinders all at 120 degees to each other.
I've tried two different ways and they still don't turn our right.  The first way was to do a face view and polar array of the part around 0,0,0 (3 units).  Then I deleted two of them.  Then I did a top view and another polar array (3 units) of the one remaining.  However the drawing isn't right.
The second try was to do a 3d Polar Array but that doesn't create an array around a point but around a line.
I'm sure there's an easy way to do this but I'm not seeing it.
Please help.
Thank you,
asked 4 years ago in progeCAD by Hylan / Level: CAD Student (72 points)

2 Answers

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Okay, I figured it out.  I needed to use 109.5 degrees for my initial 3D rotation.
answered 4 years ago by Hylan / Level: CAD Student (72 points)
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Hello Hylan,
to define a tetrahedron, first of all define an equilateral triangle. After that define a line starting from the point in the middle of the created triangle. Its height has to be defined by the following formula (a is the length on the triangle side): H=√6/3*a
Define a pyramid (Draw > 3D Entities > Pyramid);
after you select three corners of the pyramid base you can specify that it is a tetrahedron.
To define its vertex, snap to the previously defined line endpoint.
Please let us know if you received the required information. We remain at your disposal for further assistance when required.
Best regards
answered 4 years ago by progeCAD / Level: Engineering Manager (3,668 points)

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