-
Notifications
You must be signed in to change notification settings - Fork 123
/
nema_steppers.scad
226 lines (209 loc) · 9.9 KB
/
nema_steppers.scad
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
//////////////////////////////////////////////////////////////////////
// LibFile: nema_steppers.scad
// Mounting holes for NEMA motors, and simple motor models.
// Includes:
// include <BOSL2/std.scad>
// include <BOSL2/nema_steppers.scad>
// FileGroup: Parts
// FileSummary: NEMA motor mounts and stepper motor models.
//////////////////////////////////////////////////////////////////////
// Section: Motor Models
// Module: nema_stepper_motor()
// Synopsis: Creates a NEMA standard stepper motor model.
// SynTags: Geom
// Topics: Parts, Motors
// See Also: nema_stepper_motor(), nema_mount_mask()
// Usage:
// nema_stepper_motor(size, h, shaft_len, [$slop=], ...) [ATTACHMENTS];
// Description:
// Creates a model of a NEMA standard stepper motor.
// Arguments:
// size = The NEMA standard size of the stepper motor.
// h = Length of motor body. Default: 24mm
// shaft_len = Length of shaft protruding out the top of the stepper motor. Default: 20mm
// ---
// details = If false, creates a very rough motor shape, suitable for using as a mask. Default: true
// atype = The attachment set type to use when anchoring. Default: `"body"`
// $slop = If details is false then increase size of the model by double this amount (for use as a mask)
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `TOP`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
// Anchor Types:
// "shaft" = Anchor relative to the shaft.
// "plinth" = Anchor relative to the plinth.
// "body" = Anchor relative to the motor body.
// "screws" = Anchor relative to the screw hole centers. ie: TOP+RIGHT+FRONT is the center-top of the front-right screwhole.
// Examples:
// nema_stepper_motor(size=8, h=24, shaft_len=15);
// nema_stepper_motor(size=11, h=24, shaft_len=20);
// nema_stepper_motor(size=17, h=40, shaft_len=30);
// nema_stepper_motor(size=23, h=50, shaft_len=40);
// nema_stepper_motor(size=23, h=50, shaft_len=40, details=false);
module nema_stepper_motor(size=17, h=24, shaft_len=20, details=true, atype="body", anchor=TOP, spin=0, orient=UP)
{
info = nema_motor_info(size);
motor_width = info[0];
plinth_height = info[1];
plinth_diam = info[2];
screw_spacing = info[3];
screw_size = info[4];
screw_depth = info[5];
shaft_diam = info[6];
geom = atype=="shaft"? attach_geom(r=shaft_diam/2, h=shaft_len-plinth_height, cp=[0,0,h/2+plinth_height/2+shaft_len/2]) :
atype=="plinth"? attach_geom(r=plinth_diam/2, h=plinth_height, cp=[0,0,h/2+plinth_height/2]) :
atype=="body"? attach_geom(size=[motor_width, motor_width, h]) :
atype=="screws"? attach_geom(size=[screw_spacing, screw_spacing, screw_depth], cp=[0,0,h/2-screw_depth/2]) :
assert(in_list(atype, ["shaft", "plinth", "body", "screws"]));
attachable(anchor,spin,orient, geom=geom) {
up(h/2) {
if (details == false) {
slop = get_slop();
color([0.4, 0.4, 0.4])
cuboid(size=[motor_width+2*slop, motor_width+2*slop, h+slop], anchor=TOP);
color([0.6, 0.6, 0.6])
cylinder(h=plinth_height+slop, d=plinth_diam+2*slop);
color("silver")
cylinder(h=shaft_len+slop, d=shaft_diam+2*slop, $fn=max(12,segs(shaft_diam/2)));
} else if (size < 23) {
difference() {
color([0.4, 0.4, 0.4])
cuboid(size=[motor_width, motor_width, h], chamfer=size>=8? 2 : 0.5, edges="Z", anchor=TOP);
color("silver")
xcopies(screw_spacing)
ycopies(screw_spacing)
cyl(r=screw_size/2, h=screw_depth*2, $fn=max(12,segs(screw_size/2)));
}
color([0.6, 0.6, 0.6]) {
difference() {
cylinder(h=plinth_height, d=plinth_diam);
cyl(h=plinth_height*3, d=shaft_diam+0.75);
}
}
color("silver") cylinder(h=shaft_len, d=shaft_diam, $fn=max(12,segs(shaft_diam/2)));
} else {
difference() {
union() {
color([0.4, 0.4, 0.4])
cuboid([motor_width, motor_width, h], rounding=screw_size, edges="Z", anchor=TOP);
color([0.6, 0.6, 0.6]) {
difference() {
cylinder(h=plinth_height, d=plinth_diam);
cyl(h=plinth_height*3, d=shaft_diam+0.75);
}
}
color("silver")
cylinder(h=shaft_len, d=shaft_diam, $fn=max(12,segs(shaft_diam/2)));
}
color([0.4, 0.4, 0.4]) {
xcopies(screw_spacing) {
ycopies(screw_spacing) {
cyl(d=screw_size, h=screw_depth*3, $fn=max(12,segs(screw_size/2)));
down(screw_depth) cuboid([screw_size*2, screw_size*2, h], anchor=TOP);
}
}
}
}
}
}
children();
}
}
// Section: Masking Modules
// Module: nema_mount_mask()
// Synopsis: Creates a standard NEMA mount holes mask.
// SynTags: Geom
// Topics: Parts, Motors
// See Also: nema_stepper_motor(), nema_mount_mask()
// Usage:
// nema_mount_mask(size, depth, l, [$slop], ...);
// Description: Creates a mask to use when making standard NEMA stepper motor mounts.
// Arguments:
// size = The standard NEMA motor size to make a mount for.
// depth = The thickness of the mounting hole mask. Default: 5
// l = The length of the slots, for making an adjustable motor mount. Default: 5
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
// $slop = The printer-specific slop value to make parts fit just right.
// Anchor Types:
// "full" = Anchor relative the full mask.
// "screws" = Anchor relative to the screw hole centers. ie: TOP+RIGHT+FRONT is the center-top of the front-right screwhole.
// Examples:
// nema_mount_mask(size=14, depth=5, l=5);
// nema_mount_mask(size=17, depth=5, l=5);
// nema_mount_mask(size=17, depth=5, l=0);
module nema_mount_mask(size, depth=5, l=5, atype="full", anchor=CENTER, spin=0, orient=UP)
{
slop = get_slop();
info = nema_motor_info(size);
motor_width = info[0];
plinth_height = info[1];
plinth_diam = info[2] + slop;
screw_spacing = info[3];
screw_size = info[4] + slop;
screw_depth = info[5];
shaft_diam = info[6];
screwfn = quantup(max(8,segs(screw_size/2)),4);
plinthfn = quantup(max(8,segs(plinth_diam/2)),4);
s = atype=="full"? [screw_spacing+screw_size, screw_spacing+screw_size+l, depth] :
atype=="screws"? [screw_spacing, screw_spacing, depth] :
assert(in_list(atype, ["full", "screws"]));
attachable(anchor,spin,orient, size=s) {
union() {
xcopies(screw_spacing) {
ycopies(screw_spacing) {
if (l > 0) {
ycopies(l) cyl(h=depth, d=screw_size, $fn=screwfn);
cube([screw_size, l, depth], center=true);
} else {
cyl(h=depth, d=screw_size, $fn=screwfn);
}
}
}
if (l > 0) {
ycopies(l) cyl(h=depth, d=plinth_diam, $fn=plinthfn);
cube([plinth_diam, l, depth], center=true);
} else {
cyl(h=depth, d=plinth_diam, $fn=plinthfn);
}
}
children();
}
}
// Section: Functions
// Function: nema_motor_info()
// Synopsis: Returns dimension info for a given NEMA motor size.
// Topics: Parts, Motors
// See Also: nema_stepper_motor(), nema_mount_mask()
// Usage:
// info = nema_motor_info(size);
// Description:
// Gets various dimension info for a NEMA stepper motor of a specific size.
// Returns a list of scalar values, containing, in order:
// - MOTOR_WIDTH: The full width and length of the motor.
// - PLINTH_HEIGHT: The height of the circular plinth on the face of the motor.
// - PLINTH_DIAM: The diameter of the circular plinth on the face of the motor.
// - SCREW_SPACING: The spacing between screwhole centers in both X and Y axes.
// - SCREW_SIZE: The diameter of the screws.
// - SCREW_DEPTH: The depth of the screwholes.
// - SHAFT_DIAM: The diameter of the motor shaft.
// Arguments:
// size = The standard NEMA motor size.
function nema_motor_info(size) =
let(
info_arr = [
[ 6, [ 14.0, 1.50, 11.0, 11.50, 1.6, 2.5, 4.00]],
[ 8, [ 20.3, 1.50, 16.0, 15.40, 2.0, 2.5, 4.00]],
[11, [ 28.2, 1.50, 22.0, 23.11, 2.6, 3.0, 5.00]],
[14, [ 35.2, 2.00, 22.0, 26.00, 3.0, 4.5, 5.00]],
[17, [ 42.3, 2.00, 22.0, 31.00, 3.0, 4.5, 5.00]],
[23, [ 57.0, 1.60, 38.1, 47.00, 5.1, 4.8, 6.35]],
[34, [ 86.0, 2.00, 73.0, 69.60, 6.5, 10.0, 14.00]],
[42, [110.0, 1.50, 55.5, 88.90, 8.5, 12.7, 19.00]],
],
found = [for(info=info_arr) if(info[0]==size) info[1]]
)
assert(found, "Unsupported NEMA size.")
found[0];
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap