lead angle

[′lēd ‚aŋ·gəl]

(design engineering)

The angle that the tangent to a helix makes with the plane normal to the axis of the helix.

(metallurgy)

The angle at the point of welding between an electrode and a line perpendicular to the weld axis.

(ordnance)

The angle between the line of sight to a moving target and the line of sight to a point ahead of the target.

A dropping angle.

(physics)

The phase difference between a sinusoidally varying quantity and a reference quantity which varies sinusoidally at the same frequency, when this phase difference is positive. Also known as angle of lead; lead; phase lead.

lead angle

i. The angle by which an allowance is made for the radius of turn to enable the aircraft to role out on the desired track. The aircraft must commence its turn to the track before reaching it; otherwise, the aircraft will overshoot the desired track. This lead angle depends on the true air speed (TAS), distance, wind velocity, and aircraft rate of turn. In a given time out, its value is constant irrespective of the TAS.
ii. The angular difference between the line of sight and an aiming line. Also called the angle of lead

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References in periodicals archive

Nevertheless, it does not give consistent results under torque load and when the lead angle is small.

FEM Design of a Cutting-Edge Support System for Micro-GT

Given my 50 years of experience in the oil seal industry, it is very exciting to see that Bruker has come up with an innovative, non-contact measurement for shaft lead angle. The NPFLEX-LA will allow the sealing industry to continue to drive roadmap development beyond existing designs and achieve warranty targets at a reduced cost."

Bruker Demonstrates NPFLEX-LA at SAE 2011 World Congress

Taking into account the effect of lead angle into consideration only for the nodes on pressure flank, three dimensional analysis involved can be executed using two dimensional mesh pattern, with each node having three degrees of freedom.

Computing the stress concentration factor in bolted joint using FEM

The combination included an uncoated tungsten carbide insert with a chip breaker and holder providing a zero-degree lead angle. This tooling was used to develop the machinability values for the gray cast iron, and when cutting, the tool was flooded with a water-soluble cutting fluid.

Putting iron machinability to the test

It shows the calculated fraction of the maximum flow rate over the rotor wing per unit length, as a function of rotor wing helix angle for a fixed rotor speed, wing length, lead angle and land width.

Wing function technology - a new rotor technology for the Farrel Banbury mixer

Equipped with a Gen II or III tube (depending on export destination), a laser rangefinder and a north sensor, the system is aimed at the target, the latter being kept within the reticule for about two seconds; at this point range is determined and so is the slew rate allowing the Vosel to automatically offer an new aiming point within the sight that provides both the required elevation and lead angle. A simulator demonstrated that if the target was properly aimed, a bull's eye couldn't be missed -- although failure could be accounted on strong lateral wind or a sudden change of pace of the target after launch.

Safe fuzing of submunitions is possible; to render a submunition as harmless as a piece of dead wood is feasible, as Instalaza has proved it with its new Mat 120 cargo bomb. In fact, Armada's Editor discovered that this Spanish company has several aces up its sleeve. (What's Up?)

With a round in sert, there is really no "true" lead angle as it changes based upon the varying depth of cut.

Button cutter development is good news for production

Usually, the hob diameter does not correspond to the diameter of the worm which will mate with the wormwheel being machined (the module and the pitch must agree), so the lead angle of hob coils on the pitch diameter will be different from the lead angle of worm coils.

Methods of determination of wormwheel tooth surface