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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Drill Doctor DD500X Twist Drill Bit Sharpener - 3/32" to 1/2" - Electric Sharpener - High Speed & Portable - For Steel, Masonry, Carbide & Tin-Coated Drill Bits - Adjustable 118° or 135° Angle

Drill Doctor DD500X Twist Drill Bit Sharpener - 3/32" to 1/2" - Electric Sharpener - High Speed & Portable - For Steel, Masonry, Carbide & Tin-Coated Drill Bits - Adjustable 118° or 135° Angle

Product ID: 671743

🔧Adjustable 118° or 135° angles

⏱️Fast 2-3 min touch-ups

⚙️Sharpens 3/32" to 1/2" bits

€ 297.43

Duties & taxes included

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Description

⚡ Sharpen Smarter, Drill Stronger — Never Let a Dull Bit Slow You Down!

PRECISION ANGLE CONTROL - Customize your bit’s cutting edge with adjustable 118° or 135° angles for flawless performance.
UNIVERSAL COMPATIBILITY - Works seamlessly on steel, masonry, carbide, and tin-coated bits from 3/32" to 1/2".
REVIVE YOUR DULL BITS IN MINUTES - Transform worn-out drill bits into precision tools with lightning-fast sharpening.
BUILT TO LAST WITH WARRANTY CONFIDENCE - Backed by a 3-year warranty and crafted with expert engineering from Oregon.
PORTABLE POWERHOUSE FOR EVERY WORKSPACE - Compact, electric, and easy to use—perfect for home workshops or professional toolkits.

The Drill Doctor DD500X is a high-speed electric drill bit sharpener designed for twist bits ranging from 3/32" to 1/2". It offers adjustable sharpening angles of 118° or 135°, ensuring tailored precision for steel, masonry, carbide, and tin-coated bits. Engineered and calibrated in Oregon, this portable tool delivers professional-grade sharpening with a 3-year warranty, making it an essential upgrade for any serious DIYer or tradesperson looking to extend the life and performance of their drill bits.

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