# Creating multiple holes on a cylinder

Morning, All…

So… this is the top of a casing used in piling… I’ve created the countersunk holes in it by creating a small cylinder and tweaking it, then using the rotate copy to place them radially through the top of the casing, then used subtract 18 times…

Surely there’s a quicker way of doing this?

Make 1 hole, Select just the hole, Ctrl Copy, 20 degrees, 18x

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I’ve had trouble using that in the past…

You can have issues with that if the number of holes doesn’t match the number of sides, meaning the holes don’t fall on a flat face.
Simplest option, make a cylinder from a circle with 18 or 36 sides, turn on hidden geometry and delete all but one (or if 36, two sides), create your hole in the appropriate spot, then make a radial array of the whole thing to recreate your cylinder with all the holes.
Best to start centered on the origin or somehow keep the center point to enable the array.

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A trick to avoid doing any calculation in doing a full circular array:

1 - Select the item to copy;

2 - Select the Rotate Tool;

3 - Click on the center of rotation and make sure that the axis of rotation is correct;

4 - Begin rotating;

5 - Let go of the mouse;

6 - Type 360 followed by a press of the Enter key as the rotation angle;

7 - Type /N followed by a press of the Enter key as the number of copies (replace N by the required number of copies, 18 in your example).

Be aware that if you copy loose geometries, the first copy will be merged with the original. In this case, you have nothing else do do.

If you do that with a group or a component, the first copy will be superposed on the original so you will have two groups or components occupying the same location. You need to delete one of them.

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Another approach if you are in a situation where you are unable to alter the cylinder geometry to suit the hole layout is to array your tweaked cylinders, combine all of them into one single solid (geometry doesn’t have to be continuously attached to be considered a ‘solid’) and subtract just once.