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CycloidGear
BevelGear
FCGear

FCGear CycloidRack

Menu location
Gear → Cycloid Rack
Workbenches
FCGear
Default shortcut
None
Introduced in version
1.0
See also
FCGear CycloidGear

Description

Cycloid racks from left to right: Spur gearing, helical gearing, double helical gearing

Usage

  1. Switch to the FCGear Workbench.
  2. There are several ways to invoke the command:
    • Press the Cycloid Rack button in the toolbar.
    • Select the Gear → Cycloid Rack option from the menu.
  3. Change the gear parameter to the required conditions (see Properties).

Properties

An FCGear CycloidRack object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:

accuracy

  • Datanumpoints (Integer): Default is 15. Number of points for spline.

base

  • Dataadd_endings (bool): If true (default), then the total length of the rack is teeth * pitch. If false, then the rack starts with a tooth-flank.
  • Dataheight (Length): Default is 5 mm. Value of the gear width.
  • Datateeth (Integer): Default is 15. Number of teeth.
  • Datathickness (Length): Default is 5 mm. Thickness of the uncut part of the rack.

computed

  • Datatransverse_pitch (Length): (read-only) Pitch in the transverse plane.

cycloid

  • Datainner_diameter (Float): Default is 7.5. Diameter of the rolling circle of hypocycloid, normalized by the Datamodule (see Notes).
  • Dataouter_diameter (Float): Default is 7.5. Diameter of the rolling circle of epicycloid, normalized by the Datamodule (see Notes).

fillets

  • Datahead_fillet (Float): Default is 0.
  • Dataroot_fillet (Float): Default is 0.

helical

  • Databeta (Angle): Default is 0 °. With the helix angle β a helical gear is created (positive value → rotation direction right, negative value → rotation direction left).
  • Datadouble_helix (Bool): Default is false, true creates a double helix gear (see Notes).

involute

  • Datamodule (Length): Default is 1 mm. For racks the module equals the pitch and so is the distance between corresponding points on adjacent teeth (see Notes).

precision

  • Datasimplified (Bool): Default is false. If true the rack is drawn with a constant number of teeth to avoid topological renaming.

tolerance

  • Dataclearance (Float): Default is 0.25 (see Notes).
  • Datahead (Float): Default is 0. Additional length of the tip of the teeth, normalized by the Datamodule.

version

  • Dataversion (String):

Notes

See FCGear CycloidGear.

Useful formulas

See FCGear CycloidGear.

Scripting

CycloidGear
BevelGear
FCGear

This page is retrieved from https://wiki.freecad.org/FCGear_CycloidRack

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