Circle involute

 

 

 

Links/Videos:

 

This command can be used to create a tooth flank to model gears and pinions

 

Creation stages / Use:

 

Select the 2D sketch > Operations > Circle involute... command from the drop-down menu.

 

  1. Enter the base diameter value (primitive diameter multiplied by the cosinus of the pressure angle) .

  2. Enter the start diameter value (root diameter).

  3. Enter the end diameter value (outside diameter).

  4. Specify the center point for these circles.

  5. Specify the passing point (point on the base circle).

 

Example of a circle involute regarding the base diameter (in black), the start diameter (in blue) and the end diameter (in red).

 

 

To create the complete pinion from the circle involute:

  • From the pop-up menu of the sketch, select Building sketch > Edit..

  • Use the 2D sketch > Operation > Repeat, to repeat this circle involute by a symmetrical pattern with the "Straight" joint method. To know the angle of this symmetry axis regarding the passing point, divide 360° by the number of teeth, then divide this result by 4 (the width of a tooth is identical between 2 teeth)

  • When repeating the circle involute with straight joint, The tooth becomes a closed sketch. Use the Operations > Segments removing command with the Heal option set to None and remove the lower line of the tooth.

  • Repeat this result by a circular pattern (360° x the number of teeth) with the "Circular" joint method.

 

 

 

 

 

Available Options:

 

 

Allows to modify the calculation accuracy of the tooth flank (0.01mm by default).