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

Product ID: 671743

🔄Adjustable 118° or 135° angle

⏱️High-speed electric sharpening

⚙️Sharpens 3/32" to 1/2" bits

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Description

⚡ Sharpen Smarter, Work Faster – Drill Doctor DD500X Has Your Back!

PORTABLE POWERHOUSE - Compact, lightweight design lets you sharpen on-the-go—never lose momentum on your projects.
DUAL ANGLE CUSTOMIZATION - Switch effortlessly between 118° and 135° angles to match any project’s demands.
EXTEND BIT LIFE PERFORMANCE - Split cutting tips reduce wear, boosting cutting efficiency and saving you money.
PRECISION SHARPENING FOR EVERY JOB - Revive your drill bits from 3/32" to 1/2" with unmatched accuracy and speed.
BUILT WITH AMERICAN ENGINEERING EXCELLENCE - Designed, engineered, and calibrated in Oregon with a 3-year warranty for peace of mind.

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°, enhancing bit performance and longevity by splitting cutting tips. Engineered and calibrated in Oregon, this portable tool supports steel, masonry, carbide, and tin-coated bits, backed by a 3-year warranty for reliable, professional-grade sharpening.

Specifications

ASIN	B000BKUY1O
Best Sellers Rank	#26,955 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Power Drill Bit Sharpeners
Date First Available	November 9, 2004
Is Discontinued By Manufacturer	No
Item Weight	0.01 ounces
Item model number	DD500X
Manufacturer	Drill Doctor
Product Dimensions	13.75 x 5.75 x 11.75 inches

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