How do you find the Lewis form factor?

1. The Lewis form factor is directly proportional to the width of the base and number of tooth on the gear and is inversely proportional to the pitch diameter.
2. It’s more of a dimension less factor to make the formula for beam strength compact.
3. The mathematical expression is 2*b*T/(3*pi*d)

Why do we use Lewis form factor?

The Lewis equation is used to estimate the bending stress in gear teeth (max. bending stress at the root of a gear tooth). Lewis equation forms the basis of the AGMA bending stress equation used nowadays.

What is gear K factor?

The K factor is a function of the compressive stress carried on the teeth and is proportional to the square of the stress. The Unit Load is a function of the bending stress in the root area of the gears and is directly proportional to the stress. Both factors are directly proportional to the load.

What is form factor of helical gear?

When we compute the bending strength of helical teeth, values of the Lewis form factor Y are the same as for spur gears having the same number of teeth as the virtual number of teeth (Zv) in the Helical gear and a pressure angle equal to ϕn. ���� = �� ���� where ���� is the axial pitch and F is the face width.

What is beam strength of gear tooth?

The beam strength of gear teeth is determined from an equation (known as *Lewis equation) and the load carrying ability of the toothed gears as determined by this equation gives satisfactory results.

How efficient are spur gears?

Spur Gear Efficiency Spur gearing is a parallel shaft arrangement, and these gears can achieve much higher efficiencies compared to other gears types. Its efficiency varies from 94\% to 98\% with lower gears ratios.

What stresses are induced in gear tooth?

Two kinds of stresses are induced in gear pair during the power trans- mission from one shaft to another shaft. They are: 1) Bending stress – Induced on gear teeth due to tangential force developed by the power and 2) Surface contact stress or Compressive stress.

What is AK factor in sheet metal?

In sheet metal, the K-factor is the ratio of the neutral axis to the material thickness. When a piece of metal is being formed, the inner portion of the bend compresses while the outer portion expands (see Figure 1).

What is AK factor engineering?

In transportation engineering, the K factor is defined as the proportion of annual average daily traffic occurring in an hour. This factor is used for designing and analyzing the flow of traffic on highways.