How to cut holes throughout the curved surface of a cylinder?
![](https://d2t1xqejof9utc.cloudfront.net/pictures/files/25351/small.jpg?1377568762)
You can try this without add more planes
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Step 1:
Draw cylinder in symmetric plane
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Step 2:
Draw hole to cut on Front Plane
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Step 3:
Select Extruded Cut features, then activate both direction, Direction 1 & 2, from drop down box, select features 'Through All' for both direction, then click ok
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Step 4:
Select circular pattern, and follow instruction in pictures. :)