![]() ![]() Pan American Tools line of cobalt drill bits are made from heat-resistant, cobalt high-speed steel, with heavy-duty. In manufactured parts, holes with female screw threads are often needed they accept male screws to facilitate the building and fastening of a finished assembly. COBALT, CARBIDE DRILLS AND TAPS - For the toughest aerospace drilling jobs in hard aircraft metals such as steel, chrome, titanium, inconel and stainless steel, a cobalt jobber drill is the best tool an aircraft mechanic can use. I did a write-up as part of this post of why it’s so important to use the correct size countersinking pilot. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. To be consistent when countersinking, I use a Microstop Countersink drill guide and a 120 degree countersink pilot cutter. ![]() Some of the parts, such as the fiberglass tips or thicker metal pieces (from the EAA Sheet metal course I took, I learned the rule of thumb is metal ticker than 0.04 inches) need to be countersunk. Needless to say, your deeper holes can be more accurately drilled with the work clamped on a drill press. If you have to drill a 1/4' or larger size hole, always drill a pilot hole (about 1/8' diam.) first. Since the project is using Pulled Rivets, the angle of the countersunk pulled rivets is 120 degrees, as opposed to solid aviation rivets, which use 100 degrees.įor that purpose, the factory has specific dimple dies for the thinner parts that are dimpled for flush riveting. This method is quite effective but only with a small drill size - say a 40 or a 1/16' bit. Countersinking & Dimpling for flush riveting The factory has already drilled most of the holes, except for a few that need match drilling like the fiberglass tips.įor some minor alignment issues, I’m using some chucking reamer bits to correct the hole. I’ve also made myself a handy little reference block out of wood so I can quickly check sizing while I’m in the garage. The most comprehensive guide to drill sizes anywhere on the web, with complete charts covering every size in metric, imperial and fractional measurements. The kit has a lot of different measurements, so I’ve compiled some information for drilling, countersinking and rivet sizing. ![]()
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