SteerGear

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Customizable gear set for steering wheels - Created for use with AgOpenGPS

Parametric project built in FreeCAD to generate custom gears for tractor for steering wheel.

Created using Freecad 1.0.0 with freecad.gears workbench

Download SteerGears.FCStd

Variables

The VarSet contains all the available variables, it is located in the project document, below both bodies.

Customizable:

• big_teeth_count: Integer - Number of teeth of the big gear - tested in the 30-60 range
• small_teeth_count: Integer - Number of teeth of the small gear
• height: Float - Overall height of the gears
• module: Float - Module of the gear teeth
• teeth_angle: Angle - Helix angle of the gear teeth

Read only variables - Used for internal computation and as a summary of the gears info

• big_diameter: Float - Diameter of the big gear
• big_diameter_inner: Float - Inner diameter of the big gear (inside the supports)
• big_support_length: Float - Length available for support on the big gear - Used to calculate the number of holes possible in the support piece
• gear_ratio: Float - Ratio between big and small gear (big/small)

The number of holes in the support will adapt automatically based on the available support length.

To attach the small gear on a motor, you'll need to machine a square block (16mm x 16mm) that fits in your motor shaft, for example:

Export

Update the Tesselation settings to a smaller value than the FreeCAD default:

Select the BigGear body, go to "File" and then "Export". Repeat the process for the SmallGear

Fixes to possible problems

I recommend disabling automatic recompilation:

Then, after a gear parameter change, use the refresh button (🔁) to recompute

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If navigation is very slow (hover, select, ...), you can launch FreeCad with the command:

QT_QPA_PLATFORM=xcb FreeCAD

More at #16560