Parametric Timing Pulley v4
by JamesNewton, published
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http://www.sdp-si.comÂ not only has a great calculator, but they also sell belts! Prices are fantastic, and they provide the full specs for the belt, unlike McMaster-Carr. Sadly, they seem to be discontinuing some of the belt lines. Hope the one you need is still available.
Maybe the next version will add support for a captured nut for the set screws? The one wheel has it:
SDP/SI has an absolutely mac-daddy timing belt / pulley center distance / ratio calculator.
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toothType // 1 = slightly rounded, 2 = oval sharp, 3 = square. For square, set the toothWidth a little low.
$fs=0.2; // defaults 1, 0.2 is high res
$fa=3; //defaults 12, 3 is very nice
//NOTE: If rendering is very slow, change $fs to 1 and $fa to 12; at least while working.
PULLEY SPECIFIC PARAMETERS:
pitch // distance between the teeth
beltWidth // the width/height of the belt. The (vertical) size of the pulley is adapted to this.
beltThickness // thickness of the part excluding the notch depth!
notchDepth // make slightly bigger than actual, to avoid outward curvature in the inner solid part of the pulley
toothWidth // Teeth of the PULLEY, that is.
numTeeth // this value together with the pitch determines the pulley diameter
flanges // the rims that keep the belt from going anywhere, 0, 1 (on the top) or 2
flangeHeight // how much the flanges angle in toward the inner diameter of the pulley.
shaftDiameter // the shaft at the center, will be subtracted from the pulley. Better be too small than too wide.
// If there is no flat, and no setscrew, we assume the shaft is threaded and a recess for a nut is added.
// The nut size is selected automatically based on the shaft size, and reported in the compile log.
shaftFlatDiameter // the diameter of the shaft when measured at a flat milled in the shaft. 0 if the shaft is round.
hubDiameter // if the hub or timing pulley is big enough to fit a nut, this will be embedded.
hubHeight // the hub is connected to the pulley to allow a set screw to go through or as a collar for a nut.
hubSetScrewDiameter// use either a set screw or nut on a shaft. Set to 0 to not use a set screw.
hubSetScrewAngle // change from 90 to angle the setscrews
hubSetScrews // 1 is usually fine, 3 allows centering
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