Creating a big tube with holes in it

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Start a new part and then a new sketch. Use the XY plane for your sketch:

 

xy-plane

While in sketch mode draw two circles on it, then exit the sketch:

 

Two-circles-in-a-sketch

 

Now extrude, you may have to select the "profile" as being the area between the two circles:

 

 

a-profile-of-two-circles

 

In the browser select the yz plane and create a new sketch there:

 

yz-plane

 

 

Like this:

YZ-Plane-New-Sketch

 

Now you have to put some points in the sketch which can be used as hole centers. To do this make sure that center point is highlighted like this:

 

 

center-point-for-hole

 

Now when you use the point command the points you make can be used as center points:

 

point-command

 

Putting 3 points in the yz sketch will look like this:

 

 

Three-Points-In-A-Tube

 

Click on Finish Sketch, you'll return to the 3D part view. Now click on the Hole icon and you'll get something like this:

 

holes-in-a-tube

 

 

Text, images and diagrams © 2021 Owen F. Ransen. All rights reserved. (But copy the source code as much as you want!)