Involute gear plugin sketchup 2016 code#
drawRawTooth does exactly that by only drawing one rack tooth using function drawSingleToothRack.Ĭopy Code void drawSingleToothRack( ref Graphics gr, PointF Orig_offset, PointF offset, To get the right shape of the tooth, a straight rack gear can be rotated around the pitch circle giving the correct tooth form with undercut. Undercut is the tip of one tooth cutting into the bottom of the tooth on the mating gear. Challenge 1 - Undercut with Low Teeth CountĮxperiments and information on the internet show this only works for gears with more than 18 teeth, if less teeth we experience something gear makers call undercut. Draw toolpath right side of tooth for ( double angle = (gp.angle_one_tooth / 4) + gp.angle_pitch_tangent Gp.angle_pitch_tangent angle gp.outside_radius) GearTools involute function used to draw the gear teeth:įor ( double angle = -(gp.angle_one_tooth / 4). DrawInvoluteTake2, the main class with functions to drawGear, DrawCenterX, drawMultipageAlignmentGrid, drawTooth, drawRackDrive, drawRackDriven, drawRawTooth, drawIndexMarkNumbers, drawPerfectGear, calcBestMatingGearCenterDistance, drawGearFromArray, fastDrawGearFromArray, drawXaxis, drawCicleMark, makeGearAnimationFromArrayLists.BiSection, an unused attempt to be used for finding the best center distance between too gears.Ellipse, functions to draw and calculate ellipse and super ellipse.LockBitmap, Work-with-bitmap-faster-with-Csharp Added support for 16 bit needed by this program.GearParams, used to hold and do basic gear parameter calculations.GearTools, used to convert rad2deg, inch2mm, pixel2mm and calculating involute, handle polarPoint, etc.This algorithm is called Moore Neighbor Tracing.Īn explanation of the algorithm can be found here: by Erik Smistad Class NamesĪdapted the algorithm MooreNeighborTracing from CPP to C# for my special need - only the inside shape - to clean up a drawingĪdded LockBitMap to make it faster and an ArrayList to hold the polar representation of the points found. If you want a better understanding of a subject, it's adviced to take a look at the source code. Use the saved images as illustrations or as templates for gear cutting in wood and other materials. You can use the program as is to play with the gear parameters and see the result on screen. To solve issues found using one method, more algorithms was added, after doing the circular gears, standard ellipse shaped gears were added and final superellipse non circular gears.
Involute gear plugin sketchup 2016 how to#
Searching the internet, I found a lot of information about gears, but only a few snips of code on how to draw/make them but none using C#, so I started collecting information and made this program DrawInvolute. I needed a couple of wooden gears for a small hobby project. The Superellipse to make some fun looking non circular gears. The data files and the images saved can be used for illustrations and templates for cutting gears.
Youtube: Making Wooden Gears with a Router shows another way of doing this. The waste cut marked with yellow is the best approximation to the involute curve. Make Wooden Gears? Sure, Here's how by Edwin W.
Popular Science – November 1961 page 144-148 To remove waste material in gear blanks (disc) before cutting the involute curve, using the method in:
Get values to cut the gear blank (outside circle), base circle. Learn more about gears by using the program and looking into the source code DrawInvolute can be used to find best "Waste cut" for a specific gearĮxplore the details of the involute used to form the gear tooth