U48/U49 Combo Drill Tools

Many operations in aerospace manufacturing benefit from the combination of two or more of the drilling, reaming, countersinking and counterboring operations that may be required in the preparation of holes. Doing the job in one pass improves the concentricity and positional accuracy of the finished hole profile and avoids location and re-positioning challenges in series production. Many innovative fixed tools were developed in the USA to exploit these advantages, perhaps beginning with Winslow’s nutplate drill motor of 1954. The Drivematic drilling/riveting machine and the familiar Spacematic tools followed; these and similar types being very widely used by the major airframers and subcontractors. Complementary to the above, combination HSS and carbide cutting tools are required. They need to have particular shanks and seating arrangements to fit the machines, and often controlled lengths to maximize the accuracy and repeatability potential of the setups. We are pleased to offer quotations for these tools. Typical tool types are- DRILLS DRILL-COUNTERSINKS DRILL-REAM-COUNTERSINKS DRILL-COUNTERSINK-COUNTERBORES Nutplate Drill Motors usually require 8-32 or 10-32 UN threaded shanks but other fittings may be encountered Drivematic Drill/Riveters take 1/4" or 1/2" parallel shanks Spacematic Drill/Countersinking machines may require tools with particular parallel shanks for collet fitting, or 1/4-28 UN or 7/16-20 UN internal thread shanks and seats for use with cage attachments. Larger tools may be specified with larger thread sizes. Combination tools have also been developed for making the profile holes for 'TAPER-LOK' bolts. (1 in 48 taper, with a countersink; the tool may be a combination taper reamer and countersink, or may be designed to drill from the solid). These may be provided with thru-coolant holes - on some applications in titanium for example. ————— Fully dimensioned drawings of the tool are desirable in most cases. Failing that, a full description of the task required to be undertaken, with diameters and lengths, angles and tolerances required, should be provided, along with full identification of the machine in which the tool will be used, to ensure that the shank and seating will be compatible. In some countersink drill motors, the length of stroke of the machine is important, as it determines the tool body length. For some tooling, OEM identification numbers may be enough to define the requirement, if available. In all cases the quantity ordered will be very important in the determination of the unit price.