## Tutorial - Making spur gear in AutoCAD?

• ### Step 2:

Make 2 circles.

• ### Step 3:

Make the profile of the gear tooth spaces.

• ### Step 4:

Trim the circles side ways.

• ### Step 5:

Now enter "bo" command. It will show the boundary creation dialogue. Click Pick point. This command is going to be used for creating the polyline. We can also use PEDIT command. But let's try something new.

• ### Step 6:

Click inside the region and then press enter.

• ### Step 7:

Now we have the polyline created. Remember bo command doesn't join the lines but creates a polyline bounded by a region. Therefore the lines and arcs are also there.

• ### Step 8:

Make a circle of 50mm radius.

• ### Step 9:

Extrude it by 15mm.

• ### Step 10:

Now extrude the tooth polyline by 25mm.

• ### Step 11:

Array>>polar array>> and select the tooth profile extruded to array and the center point be origin and no. of items let be 12. Click OK

• ### Step 12:

Now subtract the tooth profile arrayed from the cylinderical disc and we have the gear body.

Input Parameters

Gear type - internal or external gear

Gear ratio and tooth numbers

Pressure angle (the angle of tool profile) α

Helix angle β

Module m (for metric calculation)

Diametral Pitch P (for English units)

Note: Module and Diametral Pitch are reciprocal values.

Unit clearance c*

Unit dedendum fillet rf*

Gear widths b1, b2

Unit corrections x1, x2

Note: For internal gears the opposite sign for unit correction is used in following formulas.

Summary of unit correction Σx = x1 + x2

Calculated parameters

Gearing number

 for i > 1 u = i for i < 1 u = 1 / i

Tangential module

Normal pitch

Axial pitch

Base pitch

 ptB = pt cos αt

Helix angle on the basic cylinder

 sin βb = sin β cos α

Axial pressure angle

Rolling/working pressure angle

Axial rolling/working pressure angle

Pitch diameter

Base circle diameter

 db1,2 = d1,2 cos αt

Theoretical center distance

Real center distance

Outside diameter

 da1,2 = d1,2 + 2m (a* + x1,2 - Δy) - for internal gearing the interference check is done as well for km > 0 is accomplished by addendum lowering da2 = da2 - 2km

Root diameter

 df1,2 = d1,2 - 2m (a* + c* - x1,2)

Work pitch diameter

Virtual Number of Teeth

Virtual Pitch Diameter

Virtual Base Circle Diameter

 dbn1,2 = dn1,2 cos(α)

Virtual Outside Diameter

 dan1,2 = dn1,2 + da1,2 – d1,2

Tooth thickness (measured normally on the pitch diameter)

 s1,2 = p/2 + 2mx1,2 tg α

Tooth width on the chord (measured normally)

 sc1,2 = s1,2 cos 2α

 where:

Operating width of gearings

 bw = min( b1, b2)

Relative width

Factor of mesh duration

 ε = ε + ε Factor of profile mesh duration (the minus sign applies to internal gearing) Factor of step mesh duration

Minimum correction without tapering

 where: a0* = a* + c* - rf*(1 - sin α)

Minimum correction without undercut

Minimum correction with the allowable undercut

Checking chordal dimension

 W1,2 = ((zw - 0.5) π + z1,2 inv αt) m cos α) + 2 x1,2 m sin αwhere: zw is the tooth number across which the measure is performed

Checking size across rollers/balls

 - for even tooth number M1,2 = Ds1,2 + dM - for odd tooth number M1,2 = Ds1,2 cos(90 / z1,2) + dMwhere: dM wire (ball) diameter diameter of the wire center circle wire (ball) contact angle
Sours: https://knowledge.autodesk.com/support/inventor/learn-explore/caas/CloudHelp/cloudhelp/2018/ENU/Inventor-Help/files/GUID-AC237C37-5150-4A61-9A11-C6E3DF4DE38D-htm.html

## CAD/BIM Library of blocks "gear.dwg"

Free CAD and BIM blockslibrary - content for AutoCAD, AutoCAD LT, Revit, Inventor, Fusion 360 and other 2D and 3D CAD applications by Autodesk. CAD blocks and files can be downloaded in the formats DWG, RFA, IPT, F3D. You can exchange useful blocks and symbols with other CAD and BIM users. See popular blocksand top brands.

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Selected blocks (choose category on the left):block

Total found 6 records

#### gera

gear_38.dwg

gear

cat: Gears

DWG2004

Size 63,3kB  from 27.6.2014

Uploader: realbabak  Author: babak zawari

#### Gear 2

Gear.dwg

Gear

cat: Gears

DWG2007

Size 192kB  from 22.1.2012

Uploader: amitjagtap81  Author: Amit Jagtap

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Nous apprécions tous vos commentaires et suggestions sur la fonctionnalité du catalogue CAO, sur l'arborescence des catégories, etc ainsi que sur les bogues éventuellement rencontrés. Merci de transmettre vos remarques a [email protected]

CAD blocks can be downloaded and used for your own personal or company design use only. Any distribution of the Catalog content (to other catalogs, web download, CD/DVD media, etc.) is prohibited - see Terms of use. The DWG-version problem (not valid file, invalid file, drawing not valid, cannot open) can be solved by the Tip 2869.

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