What is Dedendum circle?

Definition of dedendum circle

: the circle touching the bottom of the spaces between the teeth of a gear wheel.

What is the meaning of Dedendum?

Definition of dedendum

: the root of a gear tooth also : the distance between the dedendum circle and pitch circle of a gear wheel or rack — compare addendum.

What is difference between base circle and Dedendum circle?

dedendum circle is the circle joining the roots of the gear teeths . both are different terms and base circle exists outside the dedendum circle . so a small portion of tooth profile existbetween the two circle that is not involute.

What is the Dedendum of a gear?

Dedendum of gears – Gear Terminology

The distance between the pitch radius and the root radius at the center of one gear tooth is called the dedendum (hf) of the gear. The distance between the root radius and the tip radius is called the whole depth (h) of the gear and is determined by the size of the module (m).

What is addendum circle?

Definition of addendum circle

: a circle touching the outermost points of the teeth of a circular gear wheel — see pitch line.

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What is addendum and dedendum circle?

CIRCLE. DEDENDUM Addendum is the height of the tooth above the pitch circle. Dedendum is the depth of the tooth below the pitch circle. Whole Depth is the total length of a tooth space equal to the sum of the addendum and dedendum.

How do you find addendum and Dedendum?

Addendum (ha) is the distance between the reference line and the tooth tip. Dedendum (hf) is the distance between the reference line and the tooth root. The following are calculations of Tooth depth (h) / Addendum (ha) / Dedendum (hf) for a gear with module 2.

Which is greater addendum or Dedendum?

Addendum is the distance from pitch circle to the teeth head, so it must be less than dedendum.

What is PCD of gear?

Pitch Circle Diameter (PCD) – Gear Terminology

The pitch circle diameters are important numbers in locating the shafts of two mating gears. The center distance of two meshing gears is expressed as the sum of the pitch circle radii of the two gears.

What is a pitch circle?

: a pitch line in a circular gear that forms a circle concentric with the axis of the gear.

What is DP in gear?

The Diametral Pitch (DP) is the number of teeth per inch of diameter of the pitch circle. The units of DP are inverse inches (1/in). DP = Diametral Pitch. PD = Pitch Circle Diameter in inches.

What is base circle in Cam?

Base circle: The smallest circle from the cam center through the cam profile curve. Stroke or throw:The greatest distance or angle through which the follower moves or rotates.

Why is Dedendum value higher than addendum?

Why dedendum Value is more than addendum value? In order to get clearance between the teeth of one gear and bottom surface of mating gear so as to avoid interference, dedendum is having more value than addendum.

How is Dedendum calculated?

Now we have the gear ratio i=d2/d1=z2/z1 (gear 1 is the driving gear, and gear 2 is the driven gear). The module also has to do with the tooth height, for standard gears, the tooth height equals to 2.25*m: addendum ha=1*m, dedendum hf=1.25*m, tooth height h=2.25*m.

What is circular pitch in gear?

Definition of circular pitch

: the distance between corresponding points of consecutive gear teeth measured along the pitch circle.

What do you mean by module in gear?

Module” is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth. Thus m = d/z (Module = Reference diameter/Number of teeth)

How do I check my PCD?

What is flange PCD?

What is PCD? The PCD of a flange is one of the critical dimensions. PCD (Pitch Circle Diameter) is the diameter of a circle that goes through each of the bolt holes.

What is the difference between addendum and Dedendum in mechanical engineering?

Addendum: It is the radial distance of a tooth from the pitch circle to the top of the tooth (or addendum circle). Dedendum. It is the radial distance of a tooth from the pitch circle to the bottom of the tooth (or dedendum circle).

What is the hole in a gear called?

Pitch Point. The pitch point is the point of tangency of two pitch circles (or of a pitch circle and pitch line) and is on the line of centers. Plain Bore. This term is used to indicate that the center hole in a gear has no keyway, set screw(s), bushing or any other type of machined preparation for shaft mounting.

What is diametrical pitch?

Definition of diametral pitch

: a ratio equal to the pitch diameter of a gear in inches divided by the number of teeth in the gear.

What is flank in gear?

In crossed-axes gearing, when a gear and a mating pinion rotate steadily, the gear tooth flank, , can be viewed as an envelope to consecutive positions of the mating pinion tooth flank, . Generated in this way, the gear tooth flank, , can be used to generate the mating pinion tooth flank, .

What is base circle?

Definition of base circle

: the circle of an involute gear wheel from which the involute forming the outline of the tooth face is generated.