![]() Here is the formula, if you would rather not use the table. This table shows the preferred cutting speeds for a number of common materials.ĭrill speed is then based on cutting speed in surface feet per minute (sfm). Different materials will demand different cutting speeds. From rpm and diameter, we can calculate cutting speed, which is really what we are after. The ideal drill speed is determined by drill diameter and material to be drilled. The cleanest and quickest holes come from using a sharp bit turning at the proper rpm. Recommended Drill Speed Settings Cutting Speeds In Surface Feet For holes over 3/8 inch in sheet metal, use a step drill to enlarge the hole to its final size. Dull bits do a poor job of drilling clean holes. Buy several of each common size and sharpen or replace them often. Chuck keys have a terrible habit of disappearing just when you need them, so why not just do away with them altogether.īe sure always to use sharp bits when drilling. Keyless chucks do not make drills work better, but they sure come in handy when changing drill bits. Be sure to wear eye protection whenever using a drill or drill press. You do not want the work to start spinning or flying across the room. Remember to secure your work whenever you use a drill press. Powering a tap is best done with a milling machine. Turn the chuck by hand to start, and only use power if you have practiced-and then only if you can set your drill press to a very slow rpm. A drill press can also be beneficial to start a tap into a hole by keeping it perfectly perpendicular to the work. The ability to work at varying rpm and to get holes perfectly straight contributes greatly to producing good work. A second air drill is nice to have, but a cordless drill with a ½-inch chuck, which you will need anyway, will cover a broad spectrum of needs and let you save the cost of a second air drill.Ī drill press will often come in handy while building a plane but probably less so when just maintaining one. As you can see from the table (next page), you will also need a drill that will turn considerably slower for steel and larger diameter holes in aluminum. If you have many holes to drill, this is probably someplace where you should spend a little money and get a really good drill. Most inexpensive air drills will only turn about half that speed, and they will work, but a good high-speed drill by Sioux or a similar quality manufacturer will do a much better job, producing a rounder, cleaner hole. If you work on the structure of a metal airplane, such as any of the RV series that involves more than a few rivets, you will want a good air drill that will turn 5–6000 rpm to do a good job drilling holes for rivets. Here, your author drills a hole in a seat track for his Sportsman. A good drill press is a great tool for anyone to have to make sure holes are straight and true (right). An air drill that turns 6000 rpm is very nice for building or making major repairs to a metal airplane such as an RV. The keyless version here was picked up at Boeing surplus and only fits a limited number of sizes. Air drills come with adjustable keyed chucks or keyless chucks (center). You can often get this drill and charger with an extra battery for $99 on sale at your favorite home store. This is the all-purpose cordless drill by DeWalt (left). In this article, we will take a look at a range of drills and accessories that you may want to add to your toolbox. While many maintenance jobs can be done well enough with this drill, many more, mainly if they include installing new equipment or working in tight places, may require something more specialized. I have two myself, but as handy as that drill is, it is not the best tool for many drilling jobs. Many have the popular DeWalt cordless drill/driver that Home Depot and Lowe’s sell by the carload. ![]() ![]() Everyone has a drill in his or her toolbox.
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