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

⏱️High-speed electric sharpening

⚙️Sharpens 3/32" to 1/2" bits

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Description

⚡ Sharpen Smarter, Drill Faster – Never Miss a Beat!

SPEED MEETS PORTABILITY - High-speed electric motor delivers quick sharpening in a compact, portable design—perfect for on-the-go pros.
VERSATILE BIT COMPATIBILITY - Sharpens a wide range of twist drill bits from 3/32" to 1/2", with optional upgrades for larger sizes.
EXTEND BIT LIFE EFFICIENCY - Split cutting tips reduce wear and boost cutting power, saving you time and money on replacements.
BUILT TO LAST WITH CONFIDENCE - Backed by a 3-year warranty and crafted with precision engineering in Oregon for unmatched reliability.
PRECISION SHARPENING FOR EVERY JOB - Tailor your drill bits with adjustable angles for flawless performance on steel, masonry, carbide & tin-coated bits.

The Drill Doctor DD500X is a high-speed electric drill bit sharpener designed for professional and DIY use, sharpening twist drill bits from 3/32" to 1/2" with adjustable 118° or 135° angles. Portable and versatile, it works on steel, masonry, carbide, and tin-coated bits, extending bit life and enhancing cutting performance. Engineered and calibrated in Oregon, it comes with a 3-year warranty ensuring durability and precision.

Specifications

ASIN	B000BKUY1O
Best Sellers Rank	#30,330 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Power Drill Bit Sharpeners
Date First Available	November 9, 2004
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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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

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