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° angles

⏱️High-speed electric sharpening

⚙️Sharpens 3/32" to 1/2" bits

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Description

🔧 Sharpen Smarter, Drill Faster – Never Let a Dull Bit Slow You Down!

PORTABLE POWERHOUSE - Compact and lightweight design lets you sharpen on-the-go without sacrificing performance or speed.
VERSATILE COMPATIBILITY - Works seamlessly on steel, masonry, carbide, and tin-coated bits from 3/32" to 1/2", covering all your project needs.
BUILT TO LAST WITH CONFIDENCE - Backed by a 3-year warranty and engineered in Oregon, ensuring durability and top-tier quality you can trust.
EXTEND YOUR TOOLS LIFE SAVE - Sharpen and split drill bits to reduce wear, boost cutting efficiency, and avoid costly replacements.
PRECISION SHARPENING FOR EVERY JOB - Tailor your drill bits with adjustable angles (118° or 135°) for flawless, professional results every time.

The Drill Doctor DD500X is a high-speed, portable electric sharpener designed to restore twist drill bits from 3/32" to 1/2". It supports adjustable sharpening angles of 118° and 135°, making it compatible with steel, masonry, carbide, and tin-coated bits. Engineered and calibrated in Oregon, it offers professional-grade precision and durability backed by a 3-year warranty, helping professionals and DIYers alike extend the life and performance of their drill bits.

Specifications

ASIN	B000BKUY1O
Best Sellers Rank	#33,624 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #6 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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