Mirroring to create diagonal knurls

[sadams3EZ3Y]

I had found a you-tube video explaining how to make a knurl using the "Coil" and "Mirror" functions. I follow the tutorial and everything works, I can even see a preview (shadow) of the mirrored coil until I hit "OK". Then I get an Error message:

MIRROR 1 

            COMPUTE FAILED

                             THE SELECTED FACES DO NOT FORM A PATTERNABLE OBJECT. TRY ADDING OR REMOVING FROM THE SELECTION.

  I have watched this video and keep trying over and over, only to get the same results. Is it possible there is something in my settings that I'm not aware of.

[laughingcreek]

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@sadams3EZ3Y wrote:

... Is it possible there is something in my settings that I'm not aware of.

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Yes, it is possible.  If you export your file and attach here we can have a look.

Also, it may be better to pattern the feature that does the cut instead of faces.  Again, hard to say without the file.

[sadams3EZ3Y]

Thank you for trying to give me a hand. I'm very new to this so I hope i attached the file correctly.

[laughingcreek · Accepted solution]

hmm. not sure what's going wrong for you.  here is a link to a screen cast of mirroring and patterning to make the knurl

https://knowledge.autodesk.com/community/screencast/6bb39836-f704-47ec-a0f5-aaddd9a210a9

and the file

[sadams3EZ3Y]

Thank you that video helped , everything is working the way it should.