Gear autocad

Gear autocad DEFAULT

Tutorial - Making spur gear in AutoCAD?

  • Step 1:

    Start 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.

  • Sours: https://grabcad.com/tutorials/tutorial-making-spur-gear-in-autocad

    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 addendum a*

    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

     

    Feed factor/addendum lowering

     

    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

    Addendum height above the chord

     

    Unit addendum width (measured normally)

     

    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 α

    where:

      

    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) + dM

    where:

     
      

    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
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