Make a hole in the side of a tube
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 From:  Paolo (PAOLOLOBBIA)
3194.2 In reply to 3194.1 
Hi BIRDBRAIN,

Yust draw a cylinder 2'' dia. and place it in the correct position.
Move it into the tube and make sure that the edge of the cylinder
doesn't touch the inner surface.
Use Boolean/Diff and select the tube,then the command prompts:
"Select objects to subtract",then select the cylinder and push enter.

EDITED: 26 Dec 2009 by PAOLOLOBBIA

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 From:  Michael Gibson
3194.3 In reply to 3194.1 
Hi bb, so you have probably already seen that you can cut a hole all the way through an object by drawing a circle and using it as the cutting object in a boolean?

Like Paolo mentions if you don't want the cut to go all the way through then like Paolo says above you need to create a cylinder of the depth you want and then use that cylinder as the cutting object.

You can use either the Draw solid > Cylinder command for that, or a more general purpose way is to use Extrude on your cutting curves to punch them out into a solid, then use the extruded shape as the cutting object.

So for example if you have this tube and a circle for the hole you wish to create like this:



If you use the circle as the cutting object in the boolean, it will go all the way through like this:




But if you select your circle and use Extrude to punch it out into a solid that does not go all the way through the other object, like so:



Then you can use that extruded piece as the cutting object to make your hole only on one side and not the other:



- Michael

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