# Spur Gear Drawing

The gear ratio is the ratio of the number of teeth in the gear to the number of teeth in the pinion, the pinion being the smaller of the two gears in mesh.

The pitch-circle diameters of a pair of gears are the diameters of cylinders co-axial with the gears which will roll together without slip. The pitch circles are imaginary friction discs, and they touch at the pitch point.

The base circle is the circle from which the involute is generated.

The root diameter is the diameter at the base of the tooth.

The centre distance is the sum of the pitch-circle radii of the two gears in mesh.

The addendum is the radial depth of the tooth from the pitch circle to the tooth tip.

The dedendum is the radial depth of the tooth from the pitch circle to the root of the tooth.

The clearance is the algebraic difference between the addendum and the dedendum.

The whole depth of the tooth is the sum of the addendum and the dedendum.

The circular pitch is the distance from a point on one tooth to the corresponding point on the next tooth, measured round the pitch-circle circumference.

The tooth width is the length of arc from one side of the tooth to the other, measured round the pitch-circle circumference.

The module is the pitch-circle diameter divided by the number of teeth.

Fig. 24.15 Spur-gear terms

Fig. 24.16 Gear conventions

Fig. 24.15 Spur-gear terms

Fig. 24.16 Gear conventions

The diametral pitch is the reciprocal of the module, i.e. the number of teeth divided by the pitch-circle diameter.

The line of action is the common tangent to the base circles, and the path of contact is that part of the line of action where contact takes place between the teeth.

The pressure angle is the angle formed between the common tangent and the line of action.

The fillet is the rounded portion at the bottom of the tooth space.

The various terms are illustrated in Fig. 24.15.

+1 -1

## Pencil Drawing Beginners Guide

Easy Step-By-Step Lessons How Would You Like To Teach Yourself Some Of The Powerful Basic Techniques Of Pencil Drawing With Our Step-by-Step Tutorial. Learn the ABC of Pencil Drawing From the Experts.

Get My Free Ebook

### Responses

• Louise
What is a fillet on a base circle?
9 years ago
• gorbulas
Where is diametral pitch in spur gear drawing?
7 years ago
• leon
How draw a spur gear step by step?
4 years ago
• Marina
How to Spur Gear in Engg drawing by Hand?
4 years ago
• Safa
How to drawing gear engginering drawing?
4 years ago
• CONNER ROBERTSON
When a gear and a pinion are in mesh how is this drawn?
4 years ago
• Elisa
How to draw a gear step by joshuanava engineering drawing?
4 years ago
• sam
Is convention of spur gear?
4 years ago
• joel simola
How to draw spur gear by hand?
3 years ago
• TOBY
How to draw spur gear in sheets?
3 years ago
• LEEVI
How to draw a spur gear in mesh with a pinion?
3 years ago
• Angelica
How to make spear gear stap by stap in drawing sheet?
3 years ago
• mildred
How to produce 3 teeth spur gear in engineering drawing?
3 years ago
• John Williams
How to draw teeth on mesh gears?
3 years ago
How to draw a convectional spur gear?
3 years ago
• Yolanda
How to construct gears on engineering drawing?
3 years ago
• Anke
How to draw gear teeth by hand?
3 years ago
• shukornia
How to draw spur gear in pencil by hand?
3 years ago
• deodato
How to draw gear step by step with dedundum and addendum?
3 years ago
• meaza
How to construct an involute spur gear free hand drawing?
3 years ago
• daniel
What Is Sketches Of Dedendum?
3 years ago
• belisarius zaragamba
What are the steps in gear construction?
3 years ago
• Manuela
How to draw two gears in mesh in technical drawing?
3 years ago
• Enrico
How to Spur gears in engineering drawing?
3 years ago
• costantino trevisani
How to scale a spur gear tooth drawing?
3 years ago
• tom
How to draw a spear gear?
3 years ago
• IDA
How to make a rack and pinion gear engineering drawing?
3 years ago
• Sofia
How to construct a gear in engineering drawing?
3 years ago
• mathias
How to draw a pair of involute spur gear?
3 years ago
• noemi
How to draw spur gears in mesh?
3 years ago
• iida
How to draw spuf gear?
3 years ago
• teodros futsum
How to draw a spur gear with the information of pinion and gears?
3 years ago
• miikka
How do you draw spur gear mashes pinion?
3 years ago
• David
How to draw 5 teeth of an involute spur gear?
3 years ago
• ameera cameron
How to construct two mesh gear?
3 years ago
• dinodas
How to draw spur gear tech pen?
3 years ago
• hanna
How to draw a spur graph?
3 years ago
• Victor
How to draw gears by hand?
3 years ago
• proserpina
How to draw a spur gear in orthographic view?
3 years ago
• faryl allan
How to draw single spur gears?
3 years ago
• Baillie
How draw meshing gears in engineering?
3 years ago
• demet
How to draw spur gear in technical drawing?
3 years ago
• larry
How to make spur gear drawing?
3 years ago
• Kisanet
How to constust spur and pinion?
3 years ago
• venera
How to draw spur gear in mechanical drawing?
3 years ago
• Calimero Toscani
How to sketcha spur gear?
3 years ago
• bandobras
How to draw involute bevel gear in engineering drawing?
3 years ago
• ashlyn
How to draw a gear tooth profile manually?
3 years ago
• Selassie
What are the ways to draw the involute spur gear?
3 years ago
• yvonne
How to construct gear teeth in engineering drawing?
3 years ago
• edwin
How to construct /draw a meshing gear?
3 years ago
How to use engineering drawing a gear tooth profile?
3 years ago
• Eshan
Is convention of assembly for spur gear?
3 years ago
• piper
How to make gear drawing adendem and didem dia?
2 years ago
• kenzie
How to draw spur gears by hand?
2 years ago
• Henri
How to draw spur gear engineering drawing?
2 years ago
• Ciro
How to construct a two meshing gear with pencil?
2 years ago
How to draw detailed spur gear drawing?
2 years ago
• cirillo piazza
How to draw gears in engineering drawing?
2 years ago
• gerard
How to construct a spur gear in tecknicaldrawing?
2 years ago
• tewelde
How to construct spurt gear?
2 years ago
• benjamin fink
How to draw teeth in engineering drawing?
2 years ago
• licia
How to draw a spur gear tooth?
2 years ago
• Yorda Haylom
How to draw the pitch circle of a gear?
2 years ago
• duenna gaukrogers
HOW TO KNOW THE ORTHOGRAPHIC VIEW OF MATING GEARS?
2 years ago
• Celeste
How to draw types of gear wheels pencil drawing?
2 years ago
• valentin
How to draw a spur gear on paper?
2 years ago
• Cornelio
How to construct an involute teeth gear with compass?
2 years ago
• Enrico
How to construct spur gear tooth in Engineering drawing?
2 years ago
• helen
How to determine addendum circle and dedendum circle engineering drawing mechanical engineering?
2 years ago
• Yonatan Welde
How to draw a pinion meshes with a gear n4 draughting?
2 years ago
• Grace
How to draw spur gear in technical drawings?
2 years ago
• PEREGRIN
How to draw a spur gear tooth profile?
2 years ago
• YRJ
How to draw a spiur gear in mechanical engineering?
2 years ago
• Arvi
How to draw rack forba involute gear eng drawing?
2 years ago
• ruggero
How to drawthe spur gear?
2 years ago
• Ryan
How to construct the teeth of two gears meshing?
2 years ago
• cassio mazzanti
How to make tangent in technical drawing?
2 years ago
• ernest
How to draw gears in mesh engineering drawing of different ratios?
2 years ago
• teppo
How to construct a mesh spur gear?
2 years ago
• Irene
How to draw a tooth in gears in mesh engineering drawing?
2 years ago
• norman
How to draw spur gears in engineering?
2 years ago
• millar murphy
How to draw meshed gears on paper?
2 years ago
• esmeralda
How to draw broken spur gear with 33 teeth?
2 years ago
• reuben
How to notate gears technical drawings?
2 years ago
• regan
How to draw gears in techinical drawing?
2 years ago
• Ralf
How to draw spur gear of the sun gear meshing with the pinion?
2 years ago
• ARTTU
How to make a technical drawing of a gear?
2 years ago
• Thorsten
How to comic draw gear?
1 year ago
• claudia
How to draw a spur gear with module?
1 year ago
• demsas
What is the root diameter for a 24 pitch 10 tooth gear?
1 year ago
• armas
How do you draw 6 gears in a circular pattern that touch?
1 year ago
• Damiana
How to construct a gear in technical drawing?
1 year ago
• SEMOLINA SMALLBURROW
When drawing a spur gear, the diameters that must be tangent are?
1 year ago
• RITVA
How is teeth represent in mechanical drawing?
1 year ago
• tiffany
How to draw mechanical gear on papper?
1 year ago
• averardo
HOW TO DRAW SPUR GEAR IN THEORY?
1 year ago
• ellis
How to draw gear assemblys?
1 year ago
• mandy
How can draw spur grear?
1 year ago
• Ciriaco
How to construct spur gears?
1 year ago
How to draw spur geat?
12 months ago
• Tesmi Luwam
How to draw a doppler gear?
10 months ago
• aamos
How to draw bevell gear by pecil?
10 months ago
• matthew
How to draw involute gears manually?
10 months ago
• jennifer
What is required on a gear drawing?
10 months ago
• gina
How to draw spur gear tooth form?
8 months ago
• Cristina
How to draw them in comics a spur gears?
7 months ago
• mario
How to draw zaraganba?
6 months ago
• Ferdinand
How is a gear represented in an engineering drawing?
5 months ago
• isaias
How to draw mod 2 teeth on rack and pinion?
5 months ago
• renata
How to construct a gear on engineering draw?
5 months ago
• Nasih Senay
How to draw gear teeth step?
5 months ago
• kathy
How to draw a gear free hand drawing?
4 months ago
• laura
How to draw spur gear mating?
4 months ago
• Craig
How two sketch 2 gears mating step by step?
4 months ago
• Isengrin
How to construct a spur gear and pinion?
3 months ago
• LARA DICKSON
Do you call out basic rack on gear drawings?
2 months ago