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chimera.scad
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chimera.scad
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// INPUT VARIABLES FOR PRINTER DIMENSIONS
// Use calipers to measure the outer distance between your two linear rods
linearRodDistanceOuter = 54;
// Enter the width of your linear rods
linearRodWidth = 8;
// END INPUT VARIABLES FOR PRINTER DIMENSIONS
linearRodGapCenter = linearRodDistanceOuter - linearRodWidth;
// @see https://www.trfastenings.com/Products/knowledgebase/Tables-Standards-Terminology/Tapping-Sizes-and-Clearance-Holes
m3Clearance = 3.4;
module SunkHoleM3(depth) {
screwHoleTolerance = 0.2;
holeFragments = 25;
screwHoleRadius = (m3Clearance + screwHoleTolerance * 2) / 2;
screwHeadDepth = 2.2;
m3screwHeadClearanceRadius = 6 / 2;
translate([0, 0, depth]) {
rotate([180,0,0]) {
union() {
cylinder(depth, screwHoleRadius, screwHoleRadius, $fn=holeFragments);
cylinder(screwHeadDepth, m3screwHeadClearanceRadius, m3screwHeadClearanceRadius, $fn=holeFragments);
}
}
}
}
/**
* Creates an M3, counter sunk hole that extends a length for wide mechanical tolerance.
*
* @param depth
* How deep the hole should be
* @param tolerance
* distance between the center of the two holes.
*/
module SunkHoleM3Tolerabe(depth, tolerance) {
screwHoleTolerance = 0.2;
holeFragments = 25;
screwHoleRadius = (m3Clearance + screwHoleTolerance * 2) / 2;
screwHeadDepth = 2.2;
m3screwHeadClearanceRadius = 6 / 2;
// draw 2 inner circles
linear_extrude(depth) {
CircleTolerableLinear(screwHoleRadius, tolerance, holeFragments);
}
translate([0, 0, depth - screwHeadDepth]) {
linear_extrude(screwHeadDepth) {
CircleTolerableLinear(m3screwHeadClearanceRadius, tolerance, holeFragments);
}
}
}
module CircleTolerableLinear(holeRadius, tolerance, holeFragments) {
offset = (tolerance - (holeRadius * 4)) / 2;
translate([-tolerance/2, 0, 0]) {
hull() {
circle(holeRadius, $fn=holeFragments);
translate([tolerance, 0, 0]) {
circle(holeRadius, $fn=holeFragments);
}
}
}
}
module SCS8UU(depth, tolerance = 0) {
/*
I I
**************hole edge****************
* i i *
* O <-----i-------24----i-------> O *
* i i ^ *
* i i | *
30 i i 18 *
* i i | *
* i i v *
* O i i O *
* i i *
******************34*******************
I I
*/
holeEdgeWidth = 34;
solidEdgeLength = 30;
holeEdgeScrewDistance = 24;
solidEdgeScrewDistance = 18;
firstHoleX = ((holeEdgeWidth - holeEdgeScrewDistance) / 2);
firstHoleY = ((solidEdgeLength - solidEdgeScrewDistance) / 2);
secondHoleX = firstHoleX + holeEdgeScrewDistance;
secondHoleY = firstHoleY;
thirdHoleX = firstHoleX;
thirdHoleY = firstHoleY + solidEdgeScrewDistance;
fourthHoleX = secondHoleX;
fourthHoleY = thirdHoleY;
translate([firstHoleX, firstHoleY, 0]) {
SunkHoleM3Tolerabe(depth, tolerance);
}
translate([secondHoleX, secondHoleY, 0]) {
SunkHoleM3Tolerabe(depth, tolerance);
}
translate([thirdHoleX, thirdHoleY, 0]) {
SunkHoleM3Tolerabe(depth, tolerance);
}
translate([fourthHoleX, fourthHoleY, 0]) {
SunkHoleM3Tolerabe(depth, tolerance);
}
}
module BasePlate(topBearingGap, depth) {
bearingWidth = 30;
bearingHeight = 34;
plateWidthExtra = 2;
plateWidth = plateWidthExtra + bearingWidth + topBearingGap + bearingWidth + plateWidthExtra;
lowerBearingXOffset = (plateWidth / 2) - (bearingWidth / 2);
lowerBearingYOffset = linearRodGapCenter;
// TODO: calculate!
height = plateWidthExtra + (bearingHeight / 2) + linearRodGapCenter + (bearingHeight / 2) + plateWidthExtra;
difference() {
cube([plateWidth, height, depth]);
union() {
// 2 bearings on top with their linear cylinders oriented horizontally
translate([plateWidthExtra, plateWidthExtra, 0]) {
translate([bearingWidth, 0, 0]) {
rotate([0, 0, 90]) {
SCS8UU(depth);
}
}
}
translate([plateWidthExtra + topBearingGap + bearingWidth, plateWidthExtra, 0]) {
translate([bearingWidth, 0, 0]) {
rotate([0, 0, 90]) {
SCS8UU(depth);
}
}
}
translate([lowerBearingXOffset, lowerBearingYOffset, 0]) {
translate([bearingWidth, 0, 0]) {
rotate([0, 0, 90]) {
SCS8UU(depth, 2);
}
}
}
}
}
}
plateDepth = 5.2;
// The gap between the two bearings on the top of the base plate.
topBearingGap = 1;
BasePlate(topBearingGap, plateDepth);