I'll show you how to sharpen most drills without any fancy jigs. When you need to sharpen a twist drill on a jobsite, sometimes you have to make due. We can't always be in a nice warm, well lighted shop, with a perfect grinding stone and a drill scale. A little practice and you'll be able to sharpen bits under nearly any conditions. Be forewarned! You'll hear newly minted-shop-machinists clucking and tsk-tsking in the comments. Never you mind, because they never stray that far from the coffee room. This'll help you get it done! Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds. (pun indended)