FCGear InvoluteRack/pl: Difference between revisions
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{{Properties_Title|base}} |
{{Properties_Title|base}} |
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* {{PropertyData|add_endings|Bool}}: |
* {{PropertyData|add_endings|Bool}}: If {{True}} (default) the total length of the rack is teeth * pitch, if {{False}} the rack starts with a tooth-flank. |
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* {{PropertyData|height|Length}}: Value of the gear width. |
* {{PropertyData|height|Length}}: Default is {{Value|5,00 mm}}. Value of the gear width. |
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* {{PropertyData|module|Length}}: Module is the ratio of the reference diameter of the gear divided by the number of teeth (see [[#Notes|Notes]]). |
* {{PropertyData|module|Length}}: Default is {{Value|1,00 mm}}. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see [[#Notes|Notes]]). |
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* {{PropertyData|teeth|Integer}}: Number of teeth. |
* {{PropertyData|teeth|Integer}}: Default is {{Value|15}}. Number of teeth. |
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* {{PropertyData|thickness|Length}}: Height from the tooth root to the lower side of the rod. |
* {{PropertyData|thickness|Length}}: Default is {{Value|5}}. Height from the tooth root to the lower side of the rod. |
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{{Properties_Title|computed}} |
{{Properties_Title|computed}} |
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{{Properties_Title|fillets}} |
{{Properties_Title|fillets}} |
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* {{PropertyData|head_fillet|Float}}: |
* {{PropertyData|head_fillet|Float}}: Default is {{Value|0,00 mm}}. |
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* {{PropertyData|root_fillet|Float}}: |
* {{PropertyData|root_fillet|Float}}: Default is {{Value|0,00 mm}}. |
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{{Properties_Title|helical}} |
{{Properties_Title|helical}} |
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* {{PropertyData|beta|Angle}}: With the helix angle β a helical gear is created |
* {{PropertyData|beta|Angle}}: Default is {{Value|0,00°}}. With the helix angle β a helical gear is created – positive value → rotation direction right, negative value → rotation direction left. |
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* {{PropertyData|double_helix|Bool}}: {{ |
* {{PropertyData|double_helix|Bool}}: Default is {{False}}, {{True}} creates a double helix gear (see [[#Notes|Notes]]). |
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* {{PropertyData|properties_from_tool|Bool}}: |
* {{PropertyData|properties_from_tool|Bool}}: Default is {{False}}. If {{True}} and {{PropertyData|beta}} is not zero, gear parameters are recomputed internally for the rotated gear. |
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{{Properties_Title|involute}} |
{{Properties_Title|involute}} |
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* {{PropertyData|pressure_angle|Angle}}: Default is 20° (see [[#Notes|Notes]]). |
* {{PropertyData|pressure_angle|Angle}}: Default is {{Value|20°}} (see [[#Notes|Notes]]). |
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{{Properties_Title|precision}} |
{{Properties_Title|precision}} |
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* {{PropertyData|simplified|Bool}}: {{ |
* {{PropertyData|simplified|Bool}}: Default is {{False}}, {{True}} generates a simplified display (without teeth). |
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{{Properties_Title|tolerance}} |
{{Properties_Title|tolerance}} |
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* {{PropertyData|clearance|Float}}: Default is 0,25 (see [[#Notes|Notes]]). |
* {{PropertyData|clearance|Float}}: Default is {{Value|0,25}} (see [[#Notes|Notes]]). |
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* {{PropertyData|head|Float}}: Default is 0,00. This value is used to change the tooth height. |
* {{PropertyData|head|Float}}: Default is {{Value|0,00}}. This value is used to change the tooth height. |
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{{Properties_Title|version}} |
{{Properties_Title|version}} |
Revision as of 14:40, 5 October 2022
FCGear InvoluteRack |
Menu location |
---|
Gear → Involute Rack |
Workbenches |
FCGear |
Default shortcut |
None |
Introduced in version |
v0.16 |
See also |
FCGear InvoluteGear |
Opis
Gear racks are used to convert a rotary motion into a linear motion or vice versa. The following examples show the different applications:
- A rack with gear on at a retaining weir.
- Various rack systems of rack-and-pinion railways.
- Rack and pinion steering in a vehicle.
- Rack and pinion winch as mechanical hoist (e.g. car jack).
- Pneumatic rack and pinion drives used to control valves in pipeline transport.
From left to right: Spur gearing, helical gearing, double helical gearing
Usage
- Switch to the FCGear Workbench.
- There are several ways to invoke the command:
- Press the Involute Rack button in the toolbar.
- Select the Gear → Involute Rack option from the menu.
- Change the gear parameter to the required conditions (see Properties).
Properties
An FCGear InvoluteRack object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:
Data
base
- DANEadd_endings (
Bool
): Iftrue
(default) the total length of the rack is teeth * pitch, iffalse
the rack starts with a tooth-flank. - DANEheight (
Length
): Default is5,00 mm
. Value of the gear width. - DANEmodule (
Length
): Default is1,00 mm
. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes). - DANEteeth (
Integer
): Default is15
. Number of teeth. - DANEthickness (
Length
): Default is5
. Height from the tooth root to the lower side of the rod.
computed
- DANEtransverse_pitch (
Length
): (read-only) Pitch in the transverse plane (see Notes).
fillets
- DANEhead_fillet (
Float
): Default is0,00 mm
. - DANEroot_fillet (
Float
): Default is0,00 mm
.
helical
- DANEbeta (
Angle
): Default is0,00°
. With the helix angle β a helical gear is created – positive value → rotation direction right, negative value → rotation direction left. - DANEdouble_helix (
Bool
): Default isfalse
,true
creates a double helix gear (see Notes). - DANEproperties_from_tool (
Bool
): Default isfalse
. Iftrue
and DANEbeta is not zero, gear parameters are recomputed internally for the rotated gear.
involute
- DANEpressure_angle (
Angle
): Default is20°
(see Notes).
precision
- DANEsimplified (
Bool
): Default isfalse
,true
generates a simplified display (without teeth).
tolerance
- DANEclearance (
Float
): Default is0,25
(see Notes). - DANEhead (
Float
): Default is0,00
. This value is used to change the tooth height.
version
- DANEversion (
String
):
Notes
- transverse_pitch: The value is the result of multiplication of module * pi. This means for the standard involute rack of FCGear: 15 (teeth) * 3,14 (transverse_pitch) is 47.12 mm. See also module further below.
- clearance: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
- double_helix: To use the double helical gearing the helix angle β (beta) for the helical gearing must first be entered.
- module: Using ISO (International Organization for Standardization) guidelines, Module size is designated as the unit representing gear tooth-sizes. Module (m): m = 1 (p = 3.1416), m = 2 (p = 6.2832), m = 4 (p = 12.566). If you multiply Module by Pi, you can obtain Pitch (p). Pitch is the distance between corresponding points on adjacent teeth. The result of the multiplication is displayed in transverse_pitch
- pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.
Useful formulas
See FCGear InvoluteGear.
Scripting
Use the power of python to automate your gear modeling:
import FreeCAD as App
import freecad.gears.commands
gear = freecad.gears.commands.CreateInvoluteRack.create()
gear.teeth = 20
gear.beta = 20
gear.height = 10
gear.double_helix = True
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")