Very Simple Gears

Description

I created this very small OpenSCAD file to create very basic gears for transmitting power from stepper motors primarily, and in this instance to move a carriage along a multitap inductor for selecting different inductances. The OpenSCAD file is just a text file comprising the OpenSCAD scripts to generate the gears. There is no science behind the generation of the teeth, but for simple applications I have found them useful at the default settings: Pitch = 2.0; ToothH = 1.5; ToothSlopeAngle = 75; MeshFactor = Pitch/20; For printing I have set layer height to either 0.1mm or 0.15mm, and have printed in PLA and ABS. In the photo attached, black is ABS-X printed on a Prusa i3, and white is 3DJake Eco PLA Tough printed on a FlashForge Guider 2. I have included a number of ratios in pre-created STL files at 5mm gear thickness for a 4mm central axle, with 2 STL files for 5mm (Std Stepper Motor compatible). The following modules create the gears (lines 33 to 48 of the SCAD file): /**** All fixed gears require the 2.5mm hole in the hub to be tapped for M3 ****/ /* Parameters: (Number of Teeth, Gear Thickness, Axle Hole Diameter) */ //Cog3DToPrint(40,5,Rod4mm); /* Parameters: (Number of Teeth, Gear Thickness, Axle Hole Diameter, Fixing Hub Dia, Fixing Hub Ht) */ //FixedCog3DToPrint(80,5,Rod4mm,10,8); /* 4mm Axle Hole Parameters: (Number of Teeth Gear 1, Number of Teeth Gear 2, Gear Thickness) */ DoubleCog4mmToPrint(80,16,5); /* 3mm Axle Hole Parameters: (Number of Teeth Gear 1, Number of Teeth Gear 2, Gear Thickness) */ //DoubleCog3mmToPrint(40,10,4); /* Fixing Hub Parameters: (Fixing Hub Dia, Axle Hole Diameter, Fixing Hub Ht) */ //FixingHubToPrint(10,Rod4mm,8);

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