| fabmetheus_utilities.geometry.creation.gear ($Date: 2008/02/05 $) | index /home/enrique/Desktop/backup/babbleold/script/reprap/fabmetheus/fabmetheus_utilities/geometry/creation/gear.py | 
The gear script can generate a spur gear couple, a bevel gear couple, a ring gear couple and a rack & pinion couple.
 
A helix pattern can be added to each gear type.  All the gear types have a clearance and all the teeth can be beveled.  A keyway, shaft and lightening holes can be added to all the round gears, and rack holes can be added to the rack.  The script can output solid gears or only the gear profiles.  Both gears of the couple can be generated or just one.
 
The couple has a pinion gear and a complement.
 
Examples
  Bevel
  Collar
  Gear
  Keyway
  Rack
  Rack Hole
  Ring
  Shaft
  Shaft Top
  Spur Helix
  Spur Herringbone
  Spur Parabolic
  Spur Profile
Parameters
  Center Distance
  Clearance Couplet
    Clearance Over Wavelength
    Clearance
  Collar Addendum Couplet
    Collar Addendum Over Radius
    Collar Addendum
  Complement Collar Length Couplet
    Complement Collar Length Over Face Width
    Complement Collar Length
  Creation Type
    Both
    Complement
    Pinion
  Face Width
  Gear Hole Paths
  Helix Angle
  Helix Path
  Helix Type
    Basic
    Herringbone
    Parabolic
  Keyway Radius Couplet
    Keyway Radius Over Radius
    Keyway Radius
  Lightening Hole Margin Couplet
    Lightening Hole Margin Over Rim Dedendum
    Lightening Hole Margin
  Lightening Hole Minimum Radius
  Move Type
    None
    Mesh
    Separate
    Vertical
  Operating Angle
  Pinion Collar Length Couplet
    Pinion Collar Length Over Face Width
    Pinion Collar Length
  Pitch Radius
  Plate Clearance Couplet
    Plate Clearance Over Length
    Plate Clearance
  Plate Length Couplet
    Plate Length Over Face Width
    Plate Length
  Pressure Angle
  Profile Surfaces
  Rack Hole Below Over Width Couplet
    Rack Hole Below Over Width
    Rack Hole Below
  Rack Hole Radius Couplet
    Rack Hole Radius Over Width
    Rack Hole Radius
  Rack Hole Step Over Width Couplet
    Rack Hole Step Over Width
    Rack Hole Step
  Rack Length Over Radius Couplet
    Rack Length Over Radius
    Rack Length
  Rack Width Couplet
    Rack Width Over Face Width
    Rack Width
  Rim Dedendum Couplet
    Rim Dedendum Over Radius
    Rim Dedendum
  Root Bevel Couplet
    Root Bevel Over Clearance
    Root Bevel
  Shaft Depth Bottom Couplet
    Shaft Depth Bottom Over Radius
    Shaft Depth Bottom
  Shaft Depth Top Couplet
    Shaft Depth Top Over Radius
    Shaft Depth Top
  Shaft Path
  Shaft Radius Couplet
    Shaft Radius Over Pitch Radius
    Shaft Radius
  Shaft Sides
  Teeth Pinion
  Teeth Complement
  Tip Bevel Couplet
    Tip Bevel Over Clearance
    Tip Bevel
  Tooth Thickness Multiplier
Examples
The link text includes the distinguishing parameters.  Each svg page was generated from an xml page of the same root name using carve.  For example, gear.svg was generated by clicking 'Carve' on the carve tool panel and choosing gear.xml in the file chooser.
 
Each generated svg file has the xml fabmetheus element without comments towards the end of the file.  To see it, open the svg file in a text editor and search for 'fabmetheus'   If you copy that into a new text document, add the line '<?xml version='1.0' ?>' at the beginning and then give it a file name with the extension '.xml', you could then generate another svg file using carve.
 
Bevel
Bevel gear couple.
 
gear operatingAngle=90
 
Collar
Spur gear couple and each gear has a collar.
 
gear complementCollarLengthOverFaceWidth='1' pinionCollarLengthOverFaceWidth='1' shaftRadius='5'
 
Gear
Default spur gear with no parameters.
 
gear
 
Keyway
Spur gear couple and each gear has a collar and defined keyway.
 
gear complementCollarLengthOverFaceWidth='1' keywayRadius='2' pinionCollarLengthOverFaceWidth='1' shaftRadius='5'
 
Rack
Rack and pinion couple.
 
gear teethComplement='0'
 
Rack Hole
Rack and pinion couple, with holes in the rack.
 
gear rackHoleRadiusOverWidth='0.2' rackWidthOverFaceWidth='2' teethComplement='0'
 
Ring
Pinion and ring gear.
 
gear teethComplement='-23'
 
Shaft
Spur gear couple and each gear has a square shaft hole.
 
gear shaftRadius='5'
 
Shaft Top
Spur gear couple and each gear has a round shaft hole, truncated on top.
 
gear shaftRadius='5' shaftSides='13' shaftDepthTop='2'
 
Spur Helix
Spur gear couple with the gear teeth following a helix path.
 
gear  helixAngle='45'
 
Spur Herringbone
Spur gear couple with the gear teeth following a herringbone path.
 
gear  helixAngle='45' helixType='herringbone'
 
Spur Parabolic
Spur gear couple with the gear teeth following a parabolic path.
 
gear  helixAngle='45' helixType='parabolic'
 
Spur Profile
Spur gear couple profile.  Since this is just a horizontal path, it can not be sliced, so the path is then extruded to create a solid which can be sliced and viewed.
 
gear id='spurProfile' faceWidth='0' | extrude target='=document.getElementByID(spurProfile)
 
Parameters
Center Distance
Default is such that the pitch radius works out to twenty.
 
Defines the distance between the gear centers.
 
Clearance Couplet
Clearance Over Wavelength
Default is 0.1.
 
Defines the ratio of the clearance over the wavelength of the gear profile.  The wavelength is the arc distance between the gear teeth.
 
Clearance
Default is the 'Clearance Over Wavelength' times the wavelength.
 
Defines the clearance between the gear tooth and the other gear of the couple.  If the clearance is zero, the outside of the gear tooth will touch the other gear.  If the clearance is too high, the gear teeth will be long and weak.
 
Collar Addendum Couplet
Collar Addendum Over Radius
Default is one.
 
Defines the ratio of the collar addendum over the shaft radius.
 
Collar Addendum
Default is the 'Collar Addendum Over Radius' times the shaft radius.
 
Defines the collar addendum.
 
Complement Collar Length Couplet
Complement Collar Length Over Face Width
Default is zero.
 
Defines the ratio of the complement collar length over the face width.
 
Complement Collar Length
Default is the 'Complement Collar Length Over Face Width' times the face width.
 
Defines the complement collar length.  If the complement collar length is zero, there will not be a collar on the complement gear.
 
Creation Type
Default is 'both'.
 
Both
When selected, the pinion and complement will be generated.
 
Complement
When selected, only the complement gear or rack will be generated.
 
Pinion
When selected, only the pinion will be generated.
 
Face Width
Default is ten.
 
Defines the face width.
 
Gear Hole Paths
Default is empty.
 
Defines the centers of the gear holes.  If the gear hole paths parameter is the default empty, then the centers of the gear holes will be generated from other parameters.
 
Helix Angle
Default is zero.
 
Helix Path
Default is empty.
 
Defines the helix path of the gear teeth.  If the helix path is the default empty, then the helix will be generated from the helix angle and helix type.
 
Helix Type
Default is 'basic'.
 
Basic
When selected, the helix will be basic.
 
Herringbone
When selected, the helix will have a herringbone pattern.
 
Parabolic
When selected, the helix will have a parabolic pattern.
 
Keyway Radius Couplet
Keyway Radius Over Radius
Default is half.
 
Defines the ratio of the keyway radius over the shaft radius.
 
Keyway Radius
Default is the 'Keyway Radius Over Radius' times the shaft radius.
 
Defines the keyway radius.  If the keyway radius is zero, there will not be a keyway on the collar.
 
Lightening Hole Margin Couplet
Lightening Hole Margin Over Rim Dedendum
Default is one.
 
Defines the ratio of the lightening hole margin over the rim dedendum.
 
Lightening Hole Margin
Default is the 'Lightening Hole Margin Over Rim Dedendum' times the rim dedendum.
 
Defines the minimum margin between lightening holes.
 
Lightening Hole Minimum Radius
Default is one.
 
Defines the minimum radius of the lightening holes.
 
Move Type
Default is 'separate'.
 
None
When selected, the gears will be not be moved and will therefore overlap.  Afterwards the write plugin could be used to write each gear to a different file, so they can be fabricated in separate operations.
 
Mesh
When selected, the gears will be separated horizontally so that they just mesh.  This is useful to test if the gears mesh properly.
 
Separate
When selected, the gears will be separated horizontally with a gap between them.
 
Vertical
When selected, the gears will be separated vertically.
 
Operating Angle
Default is 180 degrees.
 
Defines the operating angle between the gear axes.  If the operating angle is not 180 degrees, a bevel gear couple will be generated.
 
Pinion Collar Length Couplet
Pinion Collar Length Over Face Width
Default is zero.
 
Defines the ratio of the pinion collar length over the face width.
 
Pinion Collar Length
Default is the 'Pinion Collar Length Over Face Width' times the face width.
 
Defines the pinion collar length.  If the pinion collar length is zero, there will not be a collar on the pinion gear.
 
Pitch Radius
Default is twenty if the pitch radius has not been set.  If the center distance is set, the default pitch radius is the center distance times the number of pinion teeth divided by the total number of gear teeth.
 
Defines the pinion pitch radius.
 
Plate Clearance Couplet
Plate Clearance Over Length
Default is 0.2.
 
Defines the ratio of the plate clearance over the plate length.
 
Plate Clearance
Default is the 'Plate Clearance Over Length' times the plate length.
 
Defines the clearance between the pinion and the plate of the ring gear.  If the clearance is zero, they will touch.
 
Plate Length Couplet
Plate Length Over Face Width
Default is half.
 
Defines the ratio of the plate length over the face width.
 
Plate Length
Default is the 'Plate Length Over Face Width' times the face width.
 
Defines the length of the plate of the ring gear.
 
Pressure Angle
Default is twenty degrees.
 
Defines the pressure angle of the gear couple.
 
Profile Surfaces
Default is eleven.
 
Defines the number of profile surfaces.
 
Rack Hole Below Over Width Couplet
Rack Hole Below Over Width
Default is 0.6.
 
Defines the ratio of the distance below the pitch of the rack holes over the rack width.
 
Rack Hole Below
Default is the 'Rack Hole Below Over Width' times the rack width.
 
Defines the the distance below the pitch of the rack holes.
 
Rack Hole Radius Couplet
Rack Hole Radius Over Width
Default is zero.
 
Defines the ratio of the rack hole radius over the rack width.
 
Rack Hole Radius
Default is the 'Rack Hole Radius Over Width' times the rack width.
 
Defines the radius of the rack holes.  If the rack hole radius is zero, there won't be any rack holes.
 
Rack Hole Step Over Width Couplet
Rack Hole Step Over Width
Default is one.
 
Defines the ratio of the rack hole step over the rack width.
 
Rack Hole Step
Default is the 'Rack Hole Step Over Width' times the rack width.
 
Defines the horizontal step distance between the rack holes.
 
Rack Length Over Radius Couplet
Rack Length Over Radius
Default is two times pi.
 
Defines the ratio of the rack length over the pitch radius.
 
Rack Length
Default is the 'Rack Length Over Radius' times the pitch radius.
 
Defines the rack length.
 
Rack Width Couplet
Rack Width Over Face Width
Default is one.
 
Defines the ratio of the rack width over the face width.
 
Rack Width
Default is the 'Rack Width Over Face Width' times the face width.
 
Defines the rack width.
 
Rim Dedendum Couplet
Rim Dedendum Over Radius
Default is 0.2.
 
Defines the ratio of the rim dedendum over the pitch radius.
 
Rim Dedendum
Default is the 'Rim Dedendum Over Radius' times the pitch radius.
 
Defines the rim dedendum of the gear.
 
Root Bevel Couplet
Root Bevel Over Clearance
Default is half.
 
Defines the ratio of the root bevel over the clearance.
 
Root Bevel
Default is the 'Root Bevel Over Clearance' times the clearance.
 
Defines the bevel at the root of the gear tooth.
 
Shaft Depth Bottom Couplet
Shaft Depth Bottom Over Radius
Default is zero.
 
Defines the ratio of the bottom shaft depth over the shaft radius.
 
Shaft Depth Bottom
Default is the 'Shaft Depth Bottom Over Radius' times the shaft radius.
 
Defines the bottom shaft depth.
 
Shaft Depth Top Couplet
Shaft Depth Top Over Radius
Default is zero.
 
Defines the ratio of the top shaft depth over the shaft radius.
 
Shaft Depth Top
Default is the 'Shaft Depth Top Over Radius' times the shaft radius.
 
Defines the top shaft depth.
 
Shaft Path
Default is empty.
 
Defines the path of the shaft hole.  If the shaft path is the default empty, then the shaft path will be generated from the shaft depth bottom, shaft depth top, shaft radius and shaft sides.
 
Shaft Radius Couplet
Shaft Radius Over Pitch Radius
Default is zero.
 
Defines the ratio of the shaft radius over the pitch radius.
 
Shaft Radius
Default is the 'Shaft Radius Over Pitch Radius' times the pitch radius.
 
Defines the shaft radius.  If the shaft radius is zero there will not be a shaft hole.
 
Shaft Sides
Default is four.
 
Defines the number of shaft sides.
 
Teeth Pinion
Default is seven.
 
Defines the number of teeth in the pinion.
 
Teeth Complement
Default is seventeen.
 
Defines the number of teeth in the complement of the gear couple.  If the number of teeth is positive, the gear couple will be a spur or bevel type.  If the number of teeth is zero, the gear couple will be a rack and pinion.  If the number of teeth is negative, the gear couple will be a spur and ring.
 
Tip Bevel Couplet
Tip Bevel Over Clearance
Default is 0.1.
 
Defines the ratio of the tip bevel over the clearance.
 
Tip Bevel
Default is the 'Tip Bevel Over Clearance' times the clearance.
 
Defines the bevel at the tip of the gear tooth.
 
Tooth Thickness Multiplier
Default is 0.99999.
 
Defines the amount the thickness of the tooth will multiplied.  If when the gears are produced, they mesh too tightly, you can reduce the tooth thickness multiplier so that they mesh with reasonable tightness.
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| Data | ||
| __author__ = 'Enrique Perez (perez_enrique@yahoo.com)' __credits__ = 'Art of Illusion <http://www.artofillusion.org/>' __date__ = '$Date: 2008/02/05 $' __license__ = 'GNU Affero General Public License http://www.gnu.org/licenses/agpl.html' absolute_import = _Feature((2, 5, 0, 'alpha', 1), (2, 7, 0, 'alpha', 0), 16384) | ||
| Author | ||
| Enrique Perez (perez_enrique@yahoo.com) | ||
| Credits | ||
| Art of Illusion <http://www.artofillusion.org/> | ||