lightening hole

lightening hole

[′līt·niŋ ‚hōl]
(civil engineering)
An opening cut into a strengthening member that decreases its weight without significantly altering its strength.

lightening hole

A hole cut in a piece of structural material in a relatively unstressed region to lighten the structure.
References in periodicals archive ?
A tactical-style TOMAHAWK joins Browning's Wihongi Signature line with a robust 0.25-inch-thick blade and lightening holes. It features a stonewash black metal finish blade etched with a Maori warrior tribal motif and semi-sharpened edge on spike end.
Caption: You might think these were openings for a vented barrel, but they are lightening holes that increase slide velocity for faster follow-up shots in competition.
Flanges are minimized, edges are scalloped, lightening holes are punched into parts in the pursuit of mass reduction.
Caption: The example above of the first reset CH-53E shows the before and after installation of new grommets to prevent chafing hazards for wiring bundles passing through lightening holes. Below, water wash lines were rerouted and clamped to maintain clearance from relay panels, wiring harnesses and fluid carrying lines.
The slotted belt guard and muffler shields mimic the lightening holes drilled through race-bike.
With the SCx, installers cut a hole in the leading edge of the wing at least two feet outside the prop arc (preferably near an inspection panel), install the adjustable leading edge lift transducer, back it up with an internal doubler and then route the connecting wires to the cockpit indicator through the wing ribs' lightening holes. Also, there is no temperature compensation required, as can be the case with pitot-static-type systems.
The grip safety is the now-normal design--up-swept with a speed bump--the trigger is aluminum with three lightening holes and an overtravel stop.
The curved trigger is adjustable for over-travel and features three lightening holes. The trigger on the test sample scaled consistently at 5 pounds pull weight, but in truth it felt lighter because there was so little creep.
440C stainless steel handles the cutting chores and three lightening holes on the backside of the blade reduce weight.
The machined 6061 T6 aluminum handle has both lightening holes and a lanyard hole.
Straight steel arms are used in place of aluminum, each with lightening holes stamped in, and aero covers on the lower links reduce underbody drag.