However, more recently gears are increasingly made using 3D data with electro-discharging machining or 3D printers. In the past, it was not necessary to draw tooth forms in gear drawings. For crowning, it is better to specify the curvature in the tooth trace direction. Also if the tooth contact is of concern, crowning and end relief, etc.
Therefore, it is desirable to describe the mating gear’s information such as the center distance.
In other words, the tabulated data determines the performance of the tooth profile and are indispensable for gear drawings. Though the teeth are not straight-sided (but usually of special form to achieve a constant drive ratio, mainly involute but less commonly cycloidal), the edge of each tooth is straight and aligned parallel to the axis of rotation. They consist of a cylinder or disk with teeth projecting radially. In contrast, the tabulated portion shows the gear specifications (size, precision, material, and treatment) as well as span or over pin measurement for the inspection dimension. Spur gears or straight-cut gears are the simplest types of gear. In addition, if the tooth position or phasing is important for the function of the part, it is indicated by the distance from the center line of the tooth or space between the teeth to the keyway or screw hole, for example. The surface roughness is to be put on the dashed line of the reference circle of the gear cross section. The orthogonal views indicate detailed shape other than the tooth form, size, geometric tolerances and surface roughness. Gear drawings show the orthogonal views of the gear and a table of essential data.
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Selectable format (file name extension) of 3D CAD models :Ĭreo Parametric 3.0/2.0 (.prt), Pro/ENGINEER Wildfire/2001 (.neu), Pro/ENGINEER Neutral (.neu), Autodesk Inventor (.stp), Solidworks (.x_t), Parasolid (.x_t), AutoCAD 3D (.sat), CATIA V5 (.igs), CATIA V4 (.igs), IGES (.igs), STEP (.stp), ANVIL (.stp), CADKey 3D (.stp), IronCAD (.stp), Mechanical Desktop (.stp), 3D PDF (.pdf), ACIS (.sat), SDRC I-DEAS (.stp), Unigraphics (.stp), AutoCAD 2D (.dxf), DXF file (.dxf), eDrawings (R) 2D (.dxf) How to draw a gear Gear drawings are generally provided in 2D CAD, 3D CAD, and print media formats, but on the KHK website it is also possible to output a drawing with the modifications applied to stock gears such as bore, keyway, and set screw hole part modifications. In either case, the gear drawing is indispensible.Īlthough this applies to machine elements in general, gear drawings must contain accurate descriptions of principle gear specifications such as number of teeth, pitch such as modules, pitch circle diameter (PCD), helix angle of helical teeth, value of tooth profile shifting, precision grade such as DIN and AGMA, geometrical tolerance, and roughness of surface.Īlso, because the strength to allow the torque required to transmit power through the gears is required, it is also necessary to accurately list the hardness of the gear, which is quantified in terms of gear material, tempering or lack thereof and tempering method, HRC and HB achieved after tempering, etc. When a machine designer requires a gear when designing a new machine, there are two possibilities: designing the new gear itself, and utilizing a standard gear which has already been designed.
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