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OpenSCAD source code: Bar clamp mounts for MPCNC
// MPCNC Bar Clamp Mounts
// Ed Nisley KE4ZNU - 2018-02-03
Layout = "Build"; // BarEnd EndBlock ScrewBlock Build
Chirality = "Right"; // bar handedness = side with opening
/* [Extrusion] */
ThreadThick = 0.25; // [0.20, 0.25]
ThreadWidth = 0.40; // [0.40]
/* [Hidden] */
Protrusion = 0.1; // [0.01, 0.1]
HoleWindage = 0.2;
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
ID = 0;
OD = 1;
LENGTH = 2;
//- Adjust hole diameter to make the size come out right
module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
FixDia = Dia / cos(180/Sides);
cylinder(r=(FixDia + HoleWindage)/2,h=Height,$fn=Sides);
}
/* [Clamp] */
BarEndOut = [34.5,21.0]; // outside dimensions
BarEndIn = [28.0,18.0]; // ... inside
BarEndSlot = [2.8,11.5]; // slot on open side
BarEndRadius = 1.5; // corner rounding
NumSides = 3*4; // ... and sides
BarHeightOC = 22.0; // min height above bench
Clearance = 0.2; // overall bar clearance
PinOffset = [14.0,2.5]; // clamp hardware pin location
PinOD = 6.5; // ... pin OD
WallThick = 5.0; // basic wall & floor thickness
EndBlockSize = [2*PinOffset.x + WallThick,BarEndOut.x + 2*WallThick,BarHeightOC + BarEndOut.y/2];
ScrewBlockSize = [2*PinOffset.x,BarEndOut.x + 2*WallThick,BarHeightOC + BarEndOut.y/2];
//-----
// Define shapes
// Aluminum bar extrusion
module BarEnd(Length = 2.0,Hollow=true) {
linear_extrude(height=Length,convexity=3)
offset(delta=Clearance)
difference() {
hull()
for (i=[-1,1], j=[-1,1])
translate([i*(BarEndOut.x/2 - BarEndRadius),j*(BarEndOut.y/2 - BarEndRadius)])
circle(r=BarEndRadius,$fn=3*4); // not related to block corner rounding
if (Hollow) {
translate([BarEndOut.x/2 - BarEndIn.x/2 - BarEndSlot.x,0])
square(BarEndIn,center=true);
translate([BarEndOut.x/2,0])
square([BarEndOut.x,BarEndSlot.y],center=true);
}
}
}
// Block supporting open end of Bar
module EndBlock() {
Normal = (Chirality == "Left") ? [0,0,0] : [0,1,0];
Radius = WallThick;
mirror(Normal)
difference() {
if (true)
hull() {
dx = EndBlockSize.x/2 - Radius;
dy = EndBlockSize.y/2 - Radius;
for (i=[-1,1],j=[-1,1])
translate([i*dx,j*dy,EndBlockSize.z - Radius]) {
sphere(r=Radius,$fn=NumSides);
cylinder(r=Radius,h=Protrusion,$fn=NumSides);
}
for (i=[-1,1],j=[-1,1])
translate([i*dx,j*dy,0])
cylinder(r=Radius,h=Protrusion,$fn=NumSides);
}
else
translate([-EndBlockSize.x/2,-EndBlockSize.y/2,0])
cube(EndBlockSize,center=false);
translate([EndBlockSize.x/2 - PinOffset.x,0*PinOffset.y,-Protrusion])
rotate(180/8)
PolyCyl(PinOD,2*EndBlockSize.z,8);
translate([EndBlockSize.x/2 - 2*PinOffset.x,0,BarHeightOC])
rotate([0,90,0]) rotate(-90)
BarEnd(Length=EndBlockSize.x);
}
}
// Block supporting screw end of Bar
// Ad-hoc chamfers to clear screw mount castings
module ScrewBlock() {
Normal = (Chirality == "Left") ? [0,0,0] : [0,1,0];
Radius = WallThick;
mirror(Normal)
difference() {
if (true)
hull() {
dx = ScrewBlockSize.x/2 - Radius;
dy = ScrewBlockSize.y/2 - Radius;
for (i=[-1,1],j=[-1,1])
translate([i*dx,j*dy,ScrewBlockSize.z - Radius]) {
sphere(r=Radius,$fn=NumSides);
cylinder(r=Radius,h=Protrusion,$fn=NumSides);
}
for (i=[-1,1],j=[-1,1])
translate([i*dx,j*dy,0])
cylinder(r=Radius,h=Protrusion,$fn=NumSides);
}
else
translate([0,0,ScrewBlockSize.z/2])
cube(ScrewBlockSize,center=true);
translate([0,PinOffset.y,-Protrusion])
rotate(180/8)
PolyCyl(PinOD,2*ScrewBlockSize.z,8);
translate([-ScrewBlockSize.x/2 - Protrusion,0,BarHeightOC])
rotate([0,90,0]) rotate(-90)
BarEnd(Length=ScrewBlockSize.x + 2*Protrusion,Hollow=false);
for (i=[-1,1])
translate([i*ScrewBlockSize.x/2,ScrewBlockSize.y/2,ScrewBlockSize.z - Protrusion])
rotate(45)
cube([sqrt(2)*WallThick,sqrt(2)*WallThick,2*ScrewBlockSize.z],center=true);
}
}
//-----
// Build things
if (Layout == "BarEnd")
BarEnd();
if (Layout == "EndBlock")
EndBlock();
if (Layout == "ScrewBlock")
ScrewBlock();
if (Layout == "Build") {
translate([EndBlockSize.z/2,0.6*EndBlockSize.y,EndBlockSize.x/2])
rotate([0,-90,0])
EndBlock();
translate([0,-0.6*ScrewBlockSize.y,0])
ScrewBlock();
}
@ednisley

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commented Feb 4, 2018

More details on my blog at https://wp.me/poZKh-7k9

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