Drill big hole for mounting step motor ?

For anyone who need to know how to drill big hole for mounting step motor , how i do?

Big hole ::

How to drill big hole like picture above, it was easy to drill that hole without sending your part to lathe shop.

1. Drill 38mm with hole saw , deep about 2mm

2. Drill 35mm with step drill , then you will get same as picture abouve

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