I'm sure I've done things like this before, but this one is giving me issues,
I'm sure it's related to the rotate, but my objects are not lining up right
with my translate commands...  Can someone tell me what's going on here, and
how to fix it?
(The first hinge works ok, but the second one, the pieces don't all move the
same....)

module Hinge(x,y,z,d){

$fn=25;

Dir= d==0?0:7;
Rot= d==0?0:180;
    echo (Dir);
rotate([0,0,0]) translate([x,y,z])   cube([29,16,2],center=false);

rotate([0,90,0]) translate([x,y+20,z+(7-Dir)]) sphere(d=2,center=false);
difference(){
    union(){
        rotate([0,0,0]) translate([x,y+16,z]) 

cube([7,4,2],center=false);
rotate([0,90,0]) translate([x,y+20,z])
cylinder(h=7,d=4,center=false);
}
rotate([0,90,0]) translate([x,y+20,z+Dir])
sphere(d=2,center=false);
}

rotate([0,90,0]) translate([x,y+20,z+(22-Dir)])

sphere(d=2,center=false);
difference(){
union(){
rotate([0,0,0]) translate([x+15,y+16,z])
cube([7,4,2],center=false);
rotate([0,90,0]) translate([x,y+20,z+15])
cylinder(h=7,d=4,center=false);
}
rotate([0,90,0]) translate([x,y+20,z+15+Dir])
sphere(d=2,center=false);
}
}
Hinge(0,0,0,1);
Hinge(40,0,0,1);

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As a generalisation, you want to do rotates before translates, particularly
when tilting cylinders.

module Hinge(x,y,z,d){

$fn=25;

Dir= d==0?0:7;
Rot= d==0?0:180;
    echo (Dir);
rotate([0,0,0]) translate([x,y,z])   cube([29,16,2],center=false);

 translate([x,y+20,z+(7-Dir)]) rotate([0,90,0])

sphere(d=2,center=false);
difference(){
union(){
rotate([0,0,0]) translate([x,y+16,z])
cube([7,4,2],center=false);
translate([x,y+20,z])rotate([0,90,0])
cylinder(h=7,d=4,center=false);
}
translate([x+7,y+20,z+(7-Dir)])rotate([0,90,0])
sphere(d=2,center=false);
}

 translate([x+15,y+20,z+(7-Dir)])rotate([0,90,0])

sphere(d=2,center=false);
difference(){
union(){
rotate([0,0,0]) translate([x+15,y+16,z])
cube([7,4,2],center=false);
translate([x+15,y+20,z]) rotate([0,90,0])
cylinder(h=7,d=4,center=false);
}
translate([x+15+7,y+20,z+(7-Dir)]) rotate([0,90,0])
sphere(d=2,center=false);
}
}
Hinge(0,0,0,1);
Hinge(40,0,0,1);

You may need to fix the Dir bits...

Admin - PM me if you need anything, or if I've done something stupid...

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ok, I'm confused now (ok, a little more?) You say to do the rotates before
the translates, but then you moved my rotates to after the translates?

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Ok, nevermind.  I got it straightened out....  I think you meant to do the
rotates AFTER the translates, because otherwise the XYZ order is changed.

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Sorry, I should have been clearer.

Operations apply to the child, and rotate() rotates around an axis.

translate() sphere() translates the sphere,
rotate() sphere() rotates the sphere, in it's place, so you don't see any
effect
rotate() translate() sphere(), moves the sphere away from the axis, then
rotates it on an axis

So what I meant by do rotates before, was to apply the rotate to the object,
rotate() object()

then translate it
translate()
rotate()
object();

Try thinking like the {} brackets are in place

translate() {
rotate() {
object();
}
}

Or try this code:

module cubeOrigin(col) {
color(col)
cube([10,15,10]);
color("red")
cylinder(d=1,h=10);
}

cubeOrigin("lightgreen");
rotate([0,0,90])
cubeOrigin("green");

translate([0,20,0])
cubeOrigin("lightblue");
rotate([0,0,90])
translate([0,20,0])
cubeOrigin("blue");

translate([0,40,0])
cubeOrigin("plum");
rotate([0,0,90])
translate([0,40,0])
cubeOrigin("purple");

translate([0,0,30]) { // move up a layer & reverse order of translate/rotate
translate([0,20,0])
cubeOrigin("lightblue");
translate([0,20,0])
rotate([0,0,90])
cubeOrigin("blue");

translate([0,40,0])
cubeOrigin("plum");
translate([0,40,0])
rotate([0,0,90])
cubeOrigin("purple");
}

http://forum.openscad.org/file/n20447/trans-rota.jpg

Note the red origin (at [0,0,0] before any transformations).

Admin - PM me if you need anything, or if I've done something stupid...

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”  Fight it! http://www.ourfairdeal.org/  time is running out!

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heh, I actually did a test very similar to your graphic to figure out how all
of it worked. :)  Thank you for your help.....

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