Using a USB endoscope camera and phone app to calibrate my Onefinity CNC X and Y axes

I have a Onefinity X50 Woodworker CNC, Masso G3 controller, and Jianken ATC spindle.
I recently finished a few modifications, and thought it a good time to calibrate my X and Y axes for travel distance and perpendicularity.
This short video slideshow describes one method to do this using a USB camera, phone app with crosshair overlay, and a precision ruler.

[@williamnorris1516]

Hi mate I always enjoy your videos and the way your mind works, everything you do is precise and clinical and I appreciate the way you work through things, cheers for posting the video regards Bill

[@tmtoronto3741]

Thank you again Bill for the thoughtful feedback - I appreciate it.

[@pretenda]

This is a really cool idea. Thanks for sharing!

[@tmtoronto3741]

Thank you. It works well. Next step is to calibrate the camera to focus on the exact spot regardless of Z height - not an easy task because of the way these cameras are manufactured. When successful, I will use it instead of my spot laser to accurately set XY zero of stock (I have a 3D probe for when I need micron-ish precision).