cracks often develop around the flange edges. The method described here does not call for accurate tool work at all-in fact my tools were made almost entirely ...
Flanging Lightening Holes By Arthur W. J. G. Ord-Hume, EAA 8579 hen making an alloy rib, spar W flange or former, it is often required to perforate the flat pieces to save weight or to provide a passage for flight systems, controls, etc. To aid in stiffening the part, these holes should be flanged. As every tin-bash-
Cur OFF
er knows, you can stiffen up a flat sheet of thin metal enormously by cutting a pattern of holes in it and flanging each one. In the airplane factory, these holes are flanged on a hydraulic rubber press. It is virtually impossible for
the amateur to hammer a flange of this type - a smooth one at any rate. A very simple method is to spin the flanges whilst the metal is in a soft condition. A form tool has to be made up for each size of hole but this job is nothing when compared with the time saved on the airplane by the use of the tool. The tool may be made of hardwood for a small run in thin metal, but ideally it should be turned in steel-not alloy bar! Fitted into the drill press, successful results have been obtained at all drill speeds, although less heat is generated at low speeds. The whole job is very much simplified if the design of the rib or frame is such that a small hole, say l /s in. or three sixteenths in. in diameter - can be spaced each side of the hole to be flanged. This ensures accurate location of the part on the lower half of the tool, making use of dowel pegs. In use, both the metal to be flanged and the tool should be liberally coated with lard or fat as a lubricant. It is possible to stamp holes and flange them in one operation on the fly-press, but tool costs are high and cracks often develop around the flange edges. The method described here does not call for accurate tool work at a l l - i n fact my tools were made almost entirely by hand! The spun flange is homogenous, smooth and, provided that the job is located properly during spinning, it is always accurate. The sketches are self-explanatory. Well polish the inside of the hole in the alloy sheet to remove roughness which could lead to cracks on spinning. Spin the flange as quickly as possible without over - stressing the metal otherwise it will age - harden. A few practice runs on scrap metal will aid proficiency. Arthur W. J. G. Ord-Hume lives at "Mirador", Rose Mead, Lake, Sandown, Isle of Wight, England.
KR657 Roll Cab and KR637 Top. Chest being awarded the best entry for the year. This award will be pre- sented during the EAA Convention. Our thanks go to ...
IAS with gear out and 15 degrees flap. (1900 rpm). .... drawing, the Sears Circle Cutter (Part. 1) mounts the tool .... grees so the bend is in line with one of the flat ...
holes in wood or building materials. ... ing holes or drill larger holes in two .... Black. 3/16. Brass from drilling into an underlying structure that doesn't need a hole.
gear and classic design delivers world class performance that dominates at ... Electrical Systems,. Wiring And Avionics ... Building Basics are supposed to be, ...
You'll need some masking tape and a pen, pencil, or fine-point marker. Make little tabs out of the masking tape to mark and trans- fer the holes. The length of ...
Jun 26, 1998 - The âRule of Thumbâ for determining bolt length is that the bolt must be long .... Recommended Hole Sizes for Self-tapping Sheet Metal Screws .... AN365 SELF-LOCKING FIBRENUT ... (D), Brass (B), and corrosion resistant Steel (C). .
locate several equally spaced holes around a round tube. Getting these mea- sured correctly on the tube itself can be difficult. I use a piece of tape to help.
Einstein-Hilbert action for d-dimensional gravity and to integrate out the additional ... Mathematically speaking we find that in the usual three dimensional world ... we consider two elementary particles, approaching each other with a very high ...
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It has invisible lines of force that start at the South Pole and go to the. North Pole. Two scientists thought that the young turtles could memorize the magnetic field ...
which transform the object into a space bridge linking two folds of the ... Introducing the same coordinate change (2) we can imbed ..... occurs in the bulk. Fusion ...
*Parallel cord (square & ridged). Clear, Brown, Gold or Black without tracer. Clear, Brown, Gold or Black with tracer. Insulated wire (other than green) with copper ...
