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.

ドリルビットシャープナー 500x Drill Doctor

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

NO FUSS MAINTENANCE - Replace grinding wheels quickly and easily without any additional tools, saving you time and hassle.
VERSATILE COMPATIBILITY - Perfectly sharpens high-speed steel, stone, carbide, and tin-coated drill bits for all your professional projects.
COMPACT LIGHTWEIGHT DESIGN - Portable 0.28g unit fits seamlessly into your workspace, ready to deliver precision sharpening whenever you need it.
DIAMOND CARBIDE GRINDING POWER - Utilizes a durable diamond carbide wheel for long-lasting, razor-sharp edges on all compatible drill blades.
PRECISION SHARPENING FOR EVERY JOB - Effortlessly sharpens standard drill bits from 3/32" to 1/2", ensuring peak performance every time.

The Drill Bit Sharpener 500X Drill Doctor is a compact, tool-free sharpening solution designed for standard drill bits ranging from 3/32" to 1/2". Featuring a diamond carbide grinding wheel, it efficiently restores high-speed steel, stone, carbide, and tin-coated drill blades to factory-sharp condition, enhancing drilling precision and extending bit life.

Specifications

ASIN	B000BKUY1O
Amazon 売れ筋ランキング	DIY・工具・ガーデン - 294,675位 ( DIY・工具・ガーデンの売れ筋ランキングを見る ) ドリルビット研磨器 - 113位
Amazon.co.jp での取り扱い開始日	2012/8/4
おすすめ度	4.6 5つ星のうち4.6 (2,519) var
メーカー	Drill Doctor
メーカーにより製造中止になりました	いいえ
入数	1
商品の重量	0.28 g
商品寸法 (長さx幅x高さ)	34.9 x 14.6 x 29.8 cm
材質	カーバイド, ダイヤモンド
製品サイズ	34.93 x 14.61 x 29.85 cm; 0.28 g
電池付属	いいえ
電池使用	いいえ

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