You can speed up your drawing by not constantly changing the direction of the UCS. When you turn on the dynamic UCS, you can draw on the face of a 3D object that temporarily becomes the new XY plane.
This is a simple Mechanical 3D modeling in Autocad 2018. For detailed dimensions, pls click this link to my website.
http://autocadnetwork.blogspot.com/2018/07/you-can-speed-up-your-drawing-by-not.html
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Please watch the detailed instruction on how to do a mechanical model using AutoCAD 2018: "Mechanical Modeling-Universal Coupling in AutoCAD 2018"
https://www.youtube.com/watch?v=E_Thbgjn1G4. I will be available to answer any related questions.
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