![]() ![]() It is in a situation like this that a right angle drill becomes necessary for making those almost inaccessible areas accessible. Even with a short bit installed, this means you will need approximately 10" to 12". In addition, access to the area where the hole is to be drilled must be accessible enough to allow you to maneuver and position the drill with the bit installed. At best, an ordinary electric drill will allow you to get within 1" of a corner but certainly no more. Your control (either air driven or electric) will very definitely have access limitations.įor example, you will find that you cannot drill closer than, maybe, 3/4" to a corner, or a perpendicular rib surface or bulkhead. ![]() I also recommend the acquisition and use of a good lightweight air drill because it is less tiring to use than the average electric drill and has an easily teased trigger for precise speed control. In addition, you should acquire a couple of 12" long (#30 and #40) drill bits for drilling in hard to reach places.īecause these long bits can be easily flexed with your fingers they can be made to drill close to corners, and just about anywhere else that a 90 degree angle drill would otherwise have to be used. ![]() ![]() However, the tougher, more expensive, Cobalt bits should be used to drill hardened steel parts like landing gear legs and engine mounts. The type of drill bit you will probably use the most is the High Speed Drill (jobbers length) because of its ready availability and low initial cost. Read on to see how you can avoid or at least limit your encounters with these, all too common, hole preparation problems. Making machine countersunk holes for flush rivets (where needed) too shallow or too deep.Forgetting to dimple the top and/or bottom skin for flush riveting.Forgetting to deburr the holes in both skins.However, as if all that isn’t bad enough - after the hole is drilled you can still create other problems by: Drilled O.K., but only after scratching the skin.After all, with thousands of holes to be drilled in a typical all-metal aircraft project, the "opportunity" exists for some of those holes to be: However, not everyone can drill a nice round hole - in thin metal - where it needs to be - and do it right every time. You want a simple twist drill bit for wood, sometimes with a brad point.įor your reference, we’ve included the following exhaustive drill bit size chart.It’s true, anyone can drill a hole.For masonry projects, you want twist bits with a carbide fin.Here are some guidelines for drill bit types and the materials they align with: Hardwood may need a slightly smaller bit size. Align the size of the drill bit with the type of material.Measure the screw thread count and diameter.Now that you know the factors you need to consider to select the correct drill bit size, it’s time to review what you need to do when selecting your bits. Practical Tips for Selecting the Right Drill Bit Size Pilot hole size requirements: The hole size should be the same as or shorter than the screw’s center core diameter.Type of material being drilled: Wood is the most common for household jobs, but you also have metal, tile, porcelain, concrete, and plastic.You need to consider several factors when selecting the right drill bit size for your project. The critical information you need to know for this article is that you need 7/64-inch and 1/8-inch drill bits for softwood and hardwood, respectively.įactors to Consider When Selecting the Right Drill Bit Size Of course, choosing the right size makes your job easy and enables it to flow well from step to step. If the pilot hole is too big, the screw won’t stay in if it’s too small, the screw won’t fit, and you may even inadvertently strip the material. If you choose the wrong size, the pilot hole you’re working with won’t match the screw. For any project involving a drill (and, therefore, drill bits), selecting the bit size that matches the screw size is always crucial. ![]()
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