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.

Drill Doctor Dd500x Drill Bit Sharpener

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Description

💡 Drill smarter, not harder — sharpen like a pro with Drill Doctor DD500X!

SPLIT POINT TECHNOLOGY - Create split tips that reduce walking and boost cutting speed—because every second counts.
VERSATILE USER FRIENDLY - Sharpen high-speed steel, masonry, carbide, and tin-coated bits with a simple, intuitive setup.
CUSTOMIZABLE CUTTING ANGLES - Easily 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 long-term partner in precision.
PRECISION SHARPENING FOR EVERY JOB - Supports standard twist bits from 3/32" to 1/2", ensuring your toolkit stays razor-sharp.

The Drill Doctor DD500X is a robust, hand-powered drill bit sharpener designed for serious DIYers and professionals. It sharpens standard twist drill bits from 3/32" to 1/2" with adjustable angles of 118° or 135°, featuring a replaceable diamond wheel for precision and durability. Its split point sharpening reduces bit walking and enhances cutting performance. Backed by a 3-year warranty, it supports a wide range of bit materials including high-speed steel, masonry, carbide, and tin-coated bits.

Specifications

ASIN	B000BKUY1O
ASIN	B000BKUY1O
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#116,258 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Drill Bit Sharpeners
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (2,503)
Customer reviews	4.6 4.6 out of 5 stars (2,503)
Date First Available	4 August 2012
Date First Available	4 August 2012
Finish	TiN
Included components	Unit^Instruction Guide
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	0.28 g
Item model number	DD500X
Item model number	DD500X
Manufacturer	Drill Doctor
Manufacturer	Drill Doctor
Material	Carbide
Measurement System	Metric
Number Of Pieces	1
Power source type	Hand Powered
Product Dimensions	34.93 x 14.61 x 29.85 cm; 0.28 g
Product Dimensions	34.93 x 14.61 x 29.85 cm; 0.28 g
Size	Pack 1
Style	Drill Doctor 500x Drill Bit Sharpener

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