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Enhanced Rack-feed Drill for Variable Stand-off Drilling Applications within Aero-structural Assembly

IP.com Disclosure Number: IPCOM000239814D
Publication Date: 2014-Dec-03
Document File: 3 page(s) / 184K

Publishing Venue

The IP.com Prior Art Database

Abstract

Drilling is one of the major operations carried out during structural assembly of an aircraft.This disclosure introduces a method to achieve desired countersink depth using rack feed tools with enhanced control over spindle travel.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

Page 01 of 3

Enhanced Rack-feed Drill for Variable Stand-off Drilling Applications within Aero-structural Assembly

  Drilling is one of the major operations carried out during structural assembly of an aircraft. Large diameters, varied stack thicknesses and different materials offer a great challenge in achieving tolerances required for all mechanical joints within the structural assembly. To achieve positional accuracy and repeatability of hole positions on aircraft components, drilling fixtures are used together with manual driven or automated drilling equipment that is mounted on to the fixture. In case of variable offset distance between the fixture and the work-piece and for drill/countersink applications, standard rack feed tools are used with manual drive to achieve countersink to the required depth with trial and error. This disclosure introduces a method to achieve desired countersink depth using rack feed tools with enhanced control over spindle travel.

Figure 1 - Schematic of rack-feed tool with major components identified

40, drilling fixture

80, saddle clamp frame

90, Material to be countersunk

20, Feed pinion gearbox

100, Air

drive inlet

60, feed rack with end stop

30, cutting tool

70, digital Vernier scale

50, extended nose piece

10, drill body with pneumatic motor



Page 02 of 3

  The enhanced rack feed, which is shown in figure 1, comprise of a standard pneumatic driven drill body 10 with an integrated rack and pinion mechanism 20 to drive the rotating spindle forward or backward. A cutter 30 is screwed on the end of the spindle interface. The drill is mounted on to the fixture 40 through an extended nosepiece 50 to in...