does aligning the chuck to 118 also applies for 135 degree geometry and what is the significance of the notches on either-side of 118?

Yes it does. The significance of the notches enable you to alter the relief and chisel angle of the drill bit. By going + you will increase the relief angle of the drill bit, useful for high speed drilling in softer metals. And vis versa going -. 45 degrees is the correct chisel angle for a drill bit. By using the alignment notches + or - you can make the drill bit more or less aggressive. A less aggressive drill has a lower chisel and relief angle. I love mine, easy to set up and use. Hope this helps.

can the degree of angle of cut be changed

Yes, you can choose between 118 and 135 degrees. Many of the videos you can find on youtube and the video that comes with the sharpener show you how to do this. you may want to take a look at the following links: https://www.youtube.com/watch?v=8wWzW8BjtiM and https://www.youtube.com/watch?v=M6bC5imB31A

Is the 500X able to sharpen 13mm bits?

I don't have a 13mm bit to test, however I have a 12mm brad point bit and it fit in the collet/chuck with a little room to spare. So you should be able to sharpen a 13mm bit.

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🔩 Keep Your Bits Sharp, Your Projects Sharp-er!

DURABLE ASSURANCE - Comes with a 3-year warranty, ensuring long-lasting quality and reliability.
PRECISION SHARPENING - Achieve razor-sharp drill bits with adjustable angles for optimal performance.
USER FRIENDLY DESIGN - Portable and easy to use, perfect for both professionals and DIY enthusiasts.
PROUDLY MADE IN THE USA - Engineered and calibrated in Oregon, supporting local craftsmanship.
VERSATILE COMPATIBILITY - Sharpen all common twist-style drill bits, including steel, masonry, and carbide.

The Drill Doctor DD500X is an electric sharpener designed to sharpen twist drill bits ranging from 3/32" to 1/2". With adjustable angles of 118° or 135°, it enhances cutting performance and reduces wear. Backed by a 3-year warranty, this portable sharpener is engineered in Oregon, ensuring high-quality craftsmanship for both professionals and DIY enthusiasts.