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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🔩 Sharpen smarter, drill faster — never settle for dull!

SPLIT POINT TECHNOLOGY - Create split tips that reduce walking and boost cutting speed for flawless results every time.
VERSATILE COMPATIBILITY - Perfect for high-speed steel, carbide, masonry, and tin-coated bits—sharpen all your essentials in one place.
CUSTOMIZABLE CUTTING ANGLES - Switch between 118° and 135° angles to match any drilling task with professional accuracy.
BUILT TO LAST WITH CONFIDENCE - Backed by a 3-year warranty, this sharpener is your reliable partner for years of DIY and professional projects.
PRECISION SHARPENING FOR EVERY JOB - Easily sharpens standard twist bits from 3/32" to 1/2", ensuring your tools are always ready to perform.

The Drill Doctor DD500X is a professional-grade drill bit sharpener designed to restore and enhance standard twist bits from 3/32" to 1/2". It offers adjustable sharpening angles of 118° and 135°, includes split point creation for improved cutting performance, and supports a wide range of bit materials including high-speed steel and carbide. With a durable build and a 3-year warranty, it’s the ultimate tool for serious DIYers and professionals aiming to extend the life and efficiency of their drill bits.

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Manufacturer	Drill Doctor
Product Dimensions	34.93 x 14.61 x 29.85 cm; 0.28 g
Item model number	DD500X
Size	pack 1
Colour	Black
Style	Drill Doctor 500x Drill Bit Sharpener
Finish	High Speed Steel,High-speed Steel
Material	Carbide
Power Source	Hand Powered
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Included Components	Unit^Instruction Guide
Batteries included?	No
Batteries Required?	No
Item Weight	0.28 g

Drill Doctor DD500X Drill Bit Sharpener

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