07b5cb8f |
1 | # Sample: creation of simple twist drill bit |
2 | |
3 | pload MODELING VISUALIZATION |
4 | |
5 | # drill parameters (some terms taken from http://www.drill-bits.cn/drill-bits-quality.asp) |
6 | dset R 4. ;# outer radius |
7 | dset D 2*R ;# diameter |
8 | dset Rr 3.5 ;# chisel radius (outer radius minus body clearance) |
9 | |
10 | dset b 1. ;# web thickness (approximate) |
11 | dset d b/2 |
12 | |
13 | dset H 80. ;# height of the spiral part |
14 | dset a 3.*pi ;# total angle of spiral rotation |
15 | |
16 | dset sigma 118 ;# point angle, in degrees |
17 | |
18 | # Create section profile by sequence of Boolean operations |
19 | # on simple planar objects |
20 | puts "Creating the drill section profile..." |
21 | |
22 | polyline rectangle1 d -R 0 R -R 0 -d R 0 -R R 0 d -R 0 |
23 | |
24 | circle circle1 0 0 0 0 0 1 R |
25 | mkedge circle1 circle1 |
26 | wire circle1 circle1 |
27 | |
28 | circle circle2 0 0 0 0 0 1 Rr |
29 | mkedge circle2 circle2 |
30 | wire circle2 circle2 |
31 | |
32 | plane p0 |
33 | mkface rectangle1 p0 rectangle1 |
34 | mkface circle1 p0 circle1 |
35 | mkface circle2 p0 circle2 |
36 | |
37 | bcommon sec rectangle1 circle1 |
38 | # note use of 'fuse' instead of 'bfuse' -- we need to get single face |
39 | fuse sec sec circle2 |
40 | |
41 | # Construct flute profile so as to have cutting lip straight after sharpening. |
42 | # Here we need to take into account spiral shift of the flute edge |
43 | # along the point length -- the way to do that is to make spiral |
44 | # from the desired cutting lip edge and then intersect it by plane |
45 | polyline lip d -d/2 0 d -R -R/tan(sigma/2*pi/180) |
46 | |
47 | polyline sp 0 0 0 0 0 H |
48 | cylinder cc 0 0 0 0 0 1 0 -4 0 4 |
49 | line ll 0 0 a 80 |
50 | trim ll ll 0 sqrt(a*a+H*H) |
51 | |
52 | vertex v1 0 -R 0 |
53 | vertex v2 0 -R H |
54 | trotate v2 0 0 0 0 0 1 180.*a/pi |
55 | mkedge ee ll cc v1 v2 |
56 | wire gg ee |
57 | |
58 | mksweep sp |
59 | setsweep -G gg 0 0 |
60 | addsweep lip |
61 | buildsweep spiral -S |
62 | |
63 | mkface f0 p0 -R R -R R |
64 | bsection sflute spiral f0 |
65 | |
66 | # here we rely on that section curve is parameterized from 0 to 1 |
67 | # and directed as cutting lip edge; |
68 | # note that this can change if intersection algorithm is modified |
69 | explode sflute e |
70 | mkcurve cflute sflute_1 |
71 | cvalue cflute 0. x0 y0 z0 |
72 | cvalue cflute 1. x1 y1 z1 |
73 | vertex vf0 x0 y0 z0 |
74 | vertex vf1 x1 y1 z1 |
75 | |
76 | # -- variant: replace curve by arc with start at x0,y0,z0 and end at x1,y1,z1, |
77 | # -- such that tanget at start point is along Y |
78 | #dset Rflute ((x1-x0)*(x1-x0)+(y1-y0)*(y1-y0))/(2*(x1-x0)) |
79 | #circle aflute x0+Rflute y0 0 0 0 1 Rflute |
80 | #mkedge sflute_1 aflute vf0 vf1 |
81 | |
82 | # make rounding in the flute; use circle with radius Rr/2 |
83 | circle cround x0+Rr/2 y0 0 0 0 1 Rr/2 |
84 | vertex vf3 x0+Rr y0 0 |
85 | mkedge sflute_2 cround vf3 vf0 |
86 | vertex vf2 R -R 0 |
87 | edge sflute_3 vf3 vf2 |
88 | edge sflute_4 vf2 vf1 |
89 | wire w2 sflute_1 sflute_2 sflute_3 sflute_4 |
90 | mkface flute p0 w2 |
91 | |
92 | # cut flute from profile |
93 | bcut sec sec flute |
94 | trotate flute 0 0 0 0 0 1 180. |
95 | bcut sec sec flute |
96 | donly sec |
97 | |
98 | # sweep profile to get a drill body |
99 | puts "Sweeping the profile..." |
100 | |
101 | mksweep sp |
102 | setsweep -G gg 0 0 |
103 | explode sec w |
104 | addsweep sec_1 |
105 | buildsweep base -S |
106 | |
107 | # sharpen the drill (see http://tool-land.ru/zatochka-sverla.php) |
108 | puts "Sharpening..." |
109 | |
110 | dset theta a*R/H*sin((90-sigma/2)*pi/180) |
111 | plane ax1 d 1.9*D "H+1.9*D/tan(pi/180.*sigma/2.)" 0 -1 -1 |
112 | pcone sh1 ax1 0 100*sin((sigma-90)/2*pi/180.) 100 |
113 | trotate sh1 0 0 0 0 0 1 -theta*180/pi |
114 | tcopy sh1 sh2 |
115 | trotate sh2 0 0 0 0 0 1 180 |
116 | box sh -D/2 -D/2 72 D D 20 |
117 | bcommon qq sh1 sh2 |
118 | bcut sharpener sh qq |
119 | |
120 | bcut body base sharpener |
121 | |
122 | # make a shank |
123 | puts "Making a shank..." |
124 | plane pl2 0 0 -40 0 0 1 |
125 | pcylinder shank pl2 4 40 |
126 | pcone transit R 0 R |
127 | plane pl3 0 0 -40 0 0 -0.5 |
128 | pcone tail pl3 R 0 0.5 |
129 | bfuse shank shank tail |
130 | bfuse shank shank transit |
131 | bfuse drill body shank |
132 | |
133 | # check result |
134 | checkshape drill |
135 | |
136 | # show result |
137 | puts "Displaying result..." |
138 | incmesh drill 0.01 |
139 | vdisplay drill |
140 | vsetdispmode drill 1 |
141 | vfit |
142 | |
143 | # show section and sweep path |
144 | ttranslate sec_1 0 0 H; trotate sec_1 0 0 0 0 0 1 a*180/pi; incmesh gg 0.01; vdisplay gg sec_1 |