x-end/motor: position and size motor arm correctly

 * Adapt position and size of motor arm based on size of x-end.

 * Ensure motor mounting screw head recess adjusts as x_box_width
   does.

 * Automatically adjust position of zip tie points as x-end size
   changes.

diff --git a/box_frame/x-end-motor.scad b/box_frame/x-end-motor.scad
index 645fd2b..d30e847 100644 (file)
--- a/box_frame/x-end-motor.scad
+++ b/box_frame/x-end-motor.scad
@@ -9,15 +9,16 @@
 include <configuration.scad>
 use <x-end.scad>
 
-offs_adjuster_y = 5.5; // fixme: if we keep this, needs to adjust
-                      // based on size of bushing_z to clear the side
-                      // of the plate
 adj_block_x = 9;
 adj_block_y = 10;
 adj_block_z = 32;
-motor_offs_z = 0;
 
-motor_y_offset = 7;
+// fixme: if we keep this, needs to adjust based on size of bushing_z
+// to clear the side of the plate
+offs_adjuster_y = x_base_outside() - adj_block_y/2;
+
+motor_offs_z = 0; // todo: broken, not sure if useful -- adjust based on bearing size to keep straight belt line?
+motor_y_offset = 0; // todo: use z_delta for y offset,
 
 module adjustomatic() {
      difference() {
@@ -69,14 +70,14 @@ module pocket_endstop() // endstop holder grafted onto the side toward the rods
 
 module x_end_motor_sr() {
      sr_box_height = 12;
-     translate([x_base_back(),9,x_box_height - sr_box_height]) {
+     translate([x_base_back(), x_base_outside(),x_box_height - sr_box_height]) {
          difference() {
-              cube(size=[8,14+motor_y_offset,sr_box_height]);
-              translate([4,13.5+motor_y_offset,sr_box_height-1]) rotate([0,90,0]) difference() {
+              cube(size=[8,13+motor_y_offset,sr_box_height]);
+              translate([4,12.5+motor_y_offset,sr_box_height-1]) rotate([0,90,0]) difference() {
                    cylinder(r=4.5,h=4,$fn=16,center=true);
                    translate([0,0,-1]) cylinder(r=2.5,h=7,$fn=16,center=true);
               }
-              translate([9,12.6+motor_y_offset,sr_box_height]) rotate([0,45,90]) cube(size=[2,11,2]);
+              translate([9,11.6+motor_y_offset,sr_box_height]) rotate([0,45,90]) cube(size=[2,11,2]);
          }
      }
 }
@@ -84,7 +85,7 @@ module x_end_motor_sr() {
 module x_end_motor_base(){
  x_end_base();
  // motor arm
- translate(v=[-15,31,26.5+motor_offs_z]) cube(size = [17,44+motor_y_offset*2,53], center = true);
+ translate(v=[x_base_back() + x_box_width/2,x_base_outside() + (44 + motor_y_offset)/2,26.5+motor_offs_z]) cube(size = [x_box_width,44+motor_y_offset*2,53], center = true);
  // z stop adjuster
  adjustomatic();
  // x endstop holder
@@ -94,44 +95,54 @@ module x_end_motor_base(){
 screw_head_r = 3.5;
 
 module x_end_motor_holes(){
- x_end_holes();
- // Position to place
- translate(v=[-1,32,30.25+motor_offs_z]){
-  // Belt hole
-  translate(v=[-14,1,0]) cube(size = [10,46,22], center = true);
-  translate ([0, motor_y_offset, 0]) {
-  // Motor mounting holes
-  translate(v=[20,-15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
-  translate(v=[1,-15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 12, r=screw_head_r, $fn=30);
- 
+     x_end_holes();
+     // Position to place
+     translate(v=[-1,x_base_outside() + 44/2,30.25+motor_offs_z]){
+         // Belt hole
+         translate(v=[-14,1,0]) cube(size = [10,46,44/2], center = true);
+         // TODO: use built-in nema17 library to create holes
+         // FIXME: ensure these maintain bolt length as x_box_width
+         // increases (screw head holes need to be cut deeper)
 
-  translate(v=[20,-15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
-  translate(v=[1,-15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 12, r=screw_head_r, $fn=30);
+         translate ([0, motor_y_offset, 0]) {
+              // Motor mounting holes
+               // based on wilson x-ends, the intention here is to
+              // leave a 11.5mm shaft for the screw
+              motor_screwhead_depth = -x_base_back() - 11.5;
+              #translate(v=[20,-15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
+              #translate(v=[1,-15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = motor_screwhead_depth, r=screw_head_r, $fn=30);
 
 
-  translate(v=[20,15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
-  translate(v=[1,15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 12, r=screw_head_r, $fn=30);
+              translate(v=[20,-15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
+              translate(v=[1,-15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = motor_screwhead_depth, r=screw_head_r, $fn=30);
 
 
-  translate(v=[20,15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
-  translate(v=[1,15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 12, r=screw_head_r, $fn=30);
+              translate(v=[20,15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
+              translate(v=[1,15.5,-15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = motor_screwhead_depth, r=screw_head_r, $fn=30);
 
-  // Material saving cutout 
-  translate(v=[-10,12,10]) cube(size = [60,42,42], center = true);
 
-  // Material saving cutout
-  translate(v=[-10,40,-30]) rotate(a=[45,0,0])  cube(size = [60,42,42], center = true);
-  // Motor shaft cutout
-  translate(v=[0,0,0]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=17, $fn=6);
-}
-  // zip tie retainer for securing end stop wiring
-  #translate([-5,-63,14]) difference() { cylinder(r=4.5,h=4,$fn=16);
-                                          translate([0,0,-1]) cylinder(r=2.5,h=7,$fn=16);
-                                        }
-  #translate([-5,-48,x_box_height-30.5]) rotate([90,0,0]) difference() { cylinder(r=4.5,h=4,$fn=16,center=true);
-       translate([0,0,-1]) cylinder(r=2.5,h=7,$fn=16,center=true);
-  }
- }
+              translate(v=[20,15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=1.8, $fn=30);
+              translate(v=[1,15.5,15.5]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = motor_screwhead_depth, r=screw_head_r, $fn=30);
+
+              // Material saving cutout
+              translate(v=[-10,12+motor_y_offset/2,10]) cube(size = [60,42 + motor_y_offset,42], center = true);
+
+              // Material saving cutout
+              // todo (maybe...): if motor_y_offset is above 10 edge
+              // becomes very sharp, but this is a pretty unrealistic
+              // situation so might not be worth caring about.
+              translate(v=[-10,40,-30]) rotate(a=[45,0,0])  cube(size = [60,43,42], center = true);
+              // Motor shaft cutout
+              translate(v=[0,0,0]) rotate(a=[0,-90,0]) rotate(a=[0,0,90]) cylinder(h = 70, r=17, $fn=6);
+         }
+     }
+     // zip tie retainer for securing end stop wiring
+     #translate([x_base_back() + x_box_width,x_base_inside() + 4.5/2,x_box_height - 8 - bushing_xy[0]*2]) difference() { cylinder(r=4.5,h=4,$fn=16);
+         translate([0,0,-1]) cylinder(r=2.5,h=7,$fn=16);
+     }
+     #translate([x_base_back() + x_box_width,-bushing_z[2]/2 - 1,x_box_height]) rotate([90,0,0]) difference() { cylinder(r=4.5,h=4,$fn=16,center=true);
+         translate([0,0,-1]) cylinder(r=2.5,h=7,$fn=16,center=true);
+     }
 }
 
 // Final part

diff --git a/box_frame/x-end.scad b/box_frame/x-end.scad
index 56e1561..d89a11b 100644 (file)
--- a/box_frame/x-end.scad
+++ b/box_frame/x-end.scad
@@ -67,8 +67,12 @@ module nut_trap () {
      }
 }
 
-// x position of edge of main block, for attaching objects to it
+// x position of edge of main block (facing frame), for attaching objects to it
 function x_base_back() = -10 - bushing_xy[0] - x_box_width/2;
+// y position of edge of main block facing away from x-axis
+function x_base_outside() = vertical_bushing_base_size/2;
+// y position of edge of main block facing toward the x-axis
+function x_base_inside() = -x_box_length/2 - vertical_bushing_base_size/2;
 
 module x_end_base(){
 // Main block