hii autocad Guru out there.. i need serious help with small problem (to you guys)

i need to use autocad to calculate out (so that i can print out 1: 1 scale) an resulting ellipse holes of a solid 12cm rod going thru a hollow sheet metal at an angle of 30 deg c and 45 deg c.

i almost pulled off all my hair just trying to draw that stupid thing out.

can someone teach me step by step. i never really taught of using 3d modelling of autocad, only learn it myself, but apparently not enough for work.

i draw a simple pic of how the assemble is.. but it is the resulting elipse hole that i need to print out.

thanks.

You might take an approach similar to this. I used a surface for my sheet metal and a solid for my rods. The first image was created using a 2D wireframe visual style.

Here is the same image created using a Conceptual visual style.

Red = centerline

Magenta = 30 deg cylinder

Green = 90 deg cylinder

Cyan = 45 deg cylinder

Created surface, added cylinders, rotated two of the cylinders (30 deg & 45 deg) subtracted cylinders from surface, exploded resultant surface to arrive at final solution containing two ellipses and one circle. Use Area command to obtain area.

The result of a solid cylinder subtracted from another solid.

Good example ReMark.

Thanks stranger.

I still lurk daily on the AutoCAD side.

Come over for a taste of the dark side?

In April I'll be lurking in San Antonio.

If you're driving, make a quick bend around to Dallas and enjoy some smoked pork and a beer on the patio.

If you want to use autocad to calculate the resulting ellipse, as you said, to find longer radius of the ellipse, for 30° angle, type this on command line:

(/ (/ 12.0 (sin (/ (* 30 pi) 180))) 2)

for 45° angle type:

(/ (/ 12.0 (sin (/ (* 45 pi) 180))) 2)

The shorter radius will of course be 6 in both cases.