Old machinist taught me this method of sharpening a drill - part 2

everybody welcome back I'm here at my home shop again and I wanted to expand a little bit further on the old machinist method of sharpening a drill now if you do this even a little bit it's worth it to spend the eight or nine or ten dollars or I don't remember exactly what it costs but to get that little tool right there that bad boy is sold on Amazon probably even Home Depot it's made by General I'm gonna include a link in the description in this video as well so this little guy is made for sharpening a twist drill correctly by hand using that angle right there this thing is a hundred and eighteen degree included angle I think I had a question earlier in regards to how to sharpen a drill at 135 and do a split point so we're going to sharpen the 118 and we're gonna do a split point on this one so you can see that as well now the first thing that I want to cover in regards to sharpening this drill using this gauge is that when you're doing this on a regular bench grinder like what you see right here it's imperative that you start out with a wheel that's either new or that has been dressed off so it doesn't have any grooves or irregular wear and it needs to have a nice flat surface on it why well because if you sharpen this drill with this rock and it's not straight then it's going to cut that same pattern into the drill and it's useless okay so I'm going to go ahead and finish dressing off this wheel and then we're going to get into sharpening the drill now that we've got our fine stone dressed off with the dressing tool I want to give you another quick tip before we get started one is if your drill is in really sad shape which this one is not this one's actually pretty good if yours is in sad shape then it's probably a better idea to rough out the general shape of the drill on the other rock or on the other stone because you don't want to do all that work and wear a pattern in the fine stone that you want to do your precision grinding on for lack of better words okay so we've got the fine grinding stone dressed off where it's good and flat now I want to give you a quick tip if your drill is in bad shape which this one is not this one actually looks like it's pretty good if yours is in bad shape you don't want to use the fine grinding stone that you just dressed off to do your roughing work you want to go to the other side or hopefully a different grinding stone that's rougher and just dress it down and do most of your roughing work over there okay so now that we've got that part straightened out we're gonna go ahead and start grinding on this one and this is going to go pretty quick it's got one little nick and the flute nothing too bad so let's get started I'm going to show you how to use the general tool for a drill sharpening and then we'll we'll be done with this this won't take long at all [Music] okay now we got the drill sharp it'll cut right now the way it is but we want to finish it off we want to do the split point and I also wanted to show you an up-close look at what this what a correctly sharpened drill looks like using this gauge now the drill the point is going to be the same when I turn it around to the other side okay so that thing is just dead perfect in the middle now we want to do a split point on this drill and so that's going to be grinding some of the relief off of it off of both sides and that process is a little bit trickier to do and it takes a little bit of practice to get it right the reason why you do that is because it decreases tool pressure or what you notice as the effort it takes to push the drill into the part and actually get cutting at a decent rate now you're not going to notice it it's not gonna do any good for you with twist drills say under 3/8 of an inch or so especially by hand and in fact it can even promote chipping on the on the point okay so I'm I'm still gonna show you how to do it this drill I think this is a 7/16 or a half-inch I'm gonna show you how to do it on here now the problem you're gonna run into is if you have a used grinding stone the problem you're gonna have is if the corner of that grinding stone is not perfectly square it gets really hard to put that split point on there okay so I'm gonna go ahead and show you how to do it this one's in fair shape so it'll probably go pretty good but again I really don't think it's worth it for drills under 3/8 maybe even up to a half an inch so check it out okay now we got the drill ready to put the split point on it now keep in mind this drill will work just fine like it is but we're going to go ahead and put the split point on it just to show you how to do it now you want to rotate the cutting edge of the drill about 45 degrees up but this is 90 degrees and that's horizontal you want to rotate it about 90 to 45 degrees up now you want to get the side of the grinding wheel about 1/32 of an inch inside of the flute and you can lay into it pretty good and you roll it over you to do the same thing on the other side [Music] and there it is you have a perfect relief on the backside and if you notice it cuts into the point just a little bit that's what we call thin in the web or narrowing the point down that's where the the decrease and the tool pressure comes from just by getting rid of that wider web right there okay so we've learned how to thin the web down on this and again the main purpose of that is to narrow down the point right there or the web that's where most of the tool pressure comes from so I'm gonna throw a piece of aluminum up here I'm gonna drill a quick hole in it just so you get an idea how good this thing is gonna cut okay there's the drill we just sharpen it's in a regular 18 volt Milwaukee I'm going to zoom in so you can watch this thing cut but what you're looking for is equal size chips coming off of both flutes and that's how you know you did it right [Music] [Applause] [Music] okay so there's the end of the video we covered how to use the general drill gauge showed you where to get it at that thing is an indispensable tool you cannot do without that in the garage if you do any kind of hot rod work workshop work you just want to drill a good hole that sounds weird anyways so yeah that's pretty much how you do it it's not something that you're gonna pick up overnight it's not something that it's too terribly difficult to do but it does take a little practice don't be too terribly concerned with thinning the web I just I really don't think there's a whole lot of value in that on smaller stuff stuff that you would drill by hand maybe in a bigger drill that you would use in a drill press maybe something over a half inch that's just my personal opinion take it for what it's worth it's a good skill to have it will come in useful at some point so just keep that mine so anyways as usual thanks for stopping by and checking it out again man if you haven't already hit the little button down there the one that looks like this thumbs up I'd appreciate it hope to see you in the next one some really cool stuff coming up I almost forgot the most important part subscribe

Channel: diy_garage_tx

Views: 478,314

Rating: 4.7750301 out of 5

Keywords: sharpen drill bit, drill bit, DIY, machining, machinist, old mill pond, The good of the land, grind drill

Id: cADD34jgsyc

Length: 10min 24sec (624 seconds)

Published: Mon May 14 2018