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"""
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/ / Parametric Pulley with multiple belt profiles
/ / by droftarts January 2012
/ / Based on pulleys by :
/ / http : / / www . thingiverse . com / thing : 11256 by me !
/ / https : / / github . com / prusajr / PrusaMendel by Josef Prusa
/ / http : / / www . thingiverse . com / thing : 3104 by GilesBathgate
/ / http : / / www . thingiverse . com / thing : 2079 by nophead
/ / dxf tooth data from http : / / oem . cadregister . com / asp / PPOW_Entry . asp ? company = 915217 & elementID = 07807803 / METRIC / URETH / WV0025 / F
/ / pulley diameter checked and modelled from data at http : / / www . sdp - si . com / D265 / HTML / D265T016 . html
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"""
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from math import *
from boxes . vectors import *
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def tooth_spaceing_curvefit ( teeth , b , c , d ) :
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return ( ( c * teeth * * d ) / ( b + teeth * * d ) ) * teeth
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def tooth_spacing ( teeth , tooth_pitch , pitch_line_offset ) :
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return ( 2 * ( ( teeth * tooth_pitch ) / ( 3.14159265 * 2 ) - pitch_line_offset ) )
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def mirrorx ( points ) :
return [ [ - x , y ] for x , y in points ]
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class Pulley :
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spacing = {
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" MXL " : ( False , 2.032 , 0.254 ) ,
" 40DP " : ( False , 2.07264 , 0.1778 ) ,
" XL " : ( False , 5.08 , 0.254 ) ,
" H " : ( False , 9.525 , 0.381 ) ,
" T2_5 " : ( True , 0.7467 , 0.796 , 1.026 ) ,
" T5 " : ( True , 0.6523 , 1.591 , 1.064 ) ,
" T10 " : ( False , 10 , 0.93 ) ,
" AT5 " : ( True , 0.6523 , 1.591 , 1.064 ) ,
" HTD_3mm " : ( False , 3 , 0.381 ) ,
" HTD_5mm " : ( False , 5 , 0.5715 ) ,
" HTD_8mm " : ( False , 8 , 0.6858 ) ,
" GT2_2mm " : ( False , 2 , 0.254 ) ,
" GT2_3mm " : ( False , 3 , 0.381 ) ,
" GT2_5mm " : ( False , 5 , 0.5715 ) ,
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}
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profile_data = {
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" MXL " : ( 0.508 , 1.321 ) ,
" 40DP " : ( 0.457 , 1.226 ) ,
" XL " : ( 1.27 , 3.051 ) ,
" H " : ( 1.905 , 5.359 ) ,
" T2_5 " : ( 0.7 , 1.678 ) ,
" T5 " : ( 1.19 , 3.264 ) ,
" T10 " : ( 2.5 , 6.13 ) ,
" AT5 " : ( 1.19 , 4.268 ) ,
" HTD_3mm " : ( 1.289 , 2.27 ) ,
" HTD_5mm " : ( 2.199 , 3.781 ) ,
" HTD_8mm " : ( 3.607 , 6.603 ) ,
" GT2_2mm " : ( 0.764 , 1.494 ) ,
" GT2_3mm " : ( 1.169 , 2.31 ) ,
" GT2_5mm " : ( 1.969 , 3.952 ) ,
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}
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teeth = { " MXL " : [ [ - 0.660421 , - 0.5 ] , [ - 0.660421 , 0 ] , [ - 0.621898 , 0.006033 ] , [ - 0.587714 , 0.023037 ] , [ - 0.560056 , 0.049424 ] , [ - 0.541182 , 0.083609 ] , [ - 0.417357 , 0.424392 ] , [ - 0.398413 , 0.458752 ] , [ - 0.370649 , 0.48514 ] , [ - 0.336324 , 0.502074 ] , [ - 0.297744 , 0.508035 ] , [ 0.297744 , 0.508035 ] , [ 0.336268 , 0.502074 ] , [ 0.370452 , 0.48514 ] , [ 0.39811 , 0.458752 ] , [ 0.416983 , 0.424392 ] , [ 0.540808 , 0.083609 ] , [ 0.559752 , 0.049424 ] , [ 0.587516 , 0.023037 ] , [ 0.621841 , 0.006033 ] , [ 0.660421 , 0 ] , [ 0.660421 , - 0.5 ] ] ,
" 40DP " : [ [ - 0.612775 , - 0.5 ] , [ - 0.612775 , 0 ] , [ - 0.574719 , 0.010187 ] , [ - 0.546453 , 0.0381 ] , [ - 0.355953 , 0.3683 ] , [ - 0.327604 , 0.405408 ] , [ - 0.291086 , 0.433388 ] , [ - 0.248548 , 0.451049 ] , [ - 0.202142 , 0.4572 ] , [ 0.202494 , 0.4572 ] , [ 0.248653 , 0.451049 ] , [ 0.291042 , 0.433388 ] , [ 0.327609 , 0.405408 ] , [ 0.356306 , 0.3683 ] , [ 0.546806 , 0.0381 ] , [ 0.574499 , 0 .010187 ] , [ 0.612775 , 0 ] , [ 0.612775 , - 0.5 ] ] ,
" XL " : [ [ - 1.525411 , - 1 ] , [ - 1.525411 , 0 ] , [ - 1.41777 , 0.015495 ] , [ - 1.320712 , 0.059664 ] , [ - 1.239661 , 0.129034 ] , [ - 1.180042 , 0.220133 ] , [ - 0.793044 , 1.050219 ] , [ - 0.733574 , 1.141021 ] , [ - 0.652507 , 1.210425 ] , [ - 0.555366 , 1.254759 ] , [ - 0.447675 , 1.270353 ] , [ 0.447675 , 1.270353 ] , [ 0.555366 , 1.254759 ] , [ 0.652507 , 1.210425 ] , [ 0.733574 , 1.141021 ] , [ 0.793044 , 1.050219 ] , [ 1.180042 , 0.220133 ] , [ 1.239711 , 0.129034 ] , [ 1.320844 , 0.059664 ] , [ 1.417919 , 0.015495 ] , [ 1.525411 , 0 ] , [ 1.525411 , - 1 ] ] ,
" H " : [ [ - 2.6797 , - 1 ] , [ - 2.6797 , 0 ] , [ - 2.600907 , 0.006138 ] , [ - 2.525342 , 0.024024 ] , [ - 2.45412 , 0.052881 ] , [ - 2.388351 , 0.091909 ] , [ - 2.329145 , 0.140328 ] , [ - 2.277614 , 0.197358 ] , [ - 2.234875 , 0.262205 ] , [ - 2.202032 , 0.334091 ] , [ - 1.75224 , 1.57093 ] , [ - 1.719538 , 1.642815 ] , [ - 1.676883 , 1.707663 ] , [ - 1.62542 , 1.764693 ] , [ - 1.566256 , 1.813112 ] , [ - 1.500512 , 1.85214 ] , [ - 1.4293 , 1.880997 ] , [ - 1.353742 , 1.898883 ] , [ - 1.274949 , 1.905021 ] , [ 1.275281 , 1.905021 ] , [ 1.354056 , 1.898883 ] , [ 1.429576 , 1.880997 ] , [ 1.500731 , 1.85214 ] , [ 1.566411 , 1.813112 ] , [ 1.625508 , 1.764693 ] , [ 1.676919 , 1.707663 ] , [ 1.719531 , 1.642815 ] , [ 1.752233 , 1.57093 ] , [ 2.20273 , 0.334091 ] , [ 2.235433 , 0.262205 ] , [ 2.278045 , 0.197358 ] , [ 2.329455 , 0.140328 ] , [ 2.388553 , 0.091909 ] , [ 2.454233 , 0.052881 ] , [ 2.525384 , 0.024024 ] , [ 2.600904 , 0.006138 ] , [ 2.6797 , 0 ] , [ 2.6797 , - 1 ] ] ,
" T2_5 " : [ [ - 0.839258 , - 0.5 ] , [ - 0.839258 , 0 ] , [ - 0.770246 , 0.021652 ] , [ - 0.726369 , 0.079022 ] , [ - 0.529167 , 0.620889 ] , [ - 0.485025 , 0.67826 ] , [ - 0.416278 , 0.699911 ] , [ 0.416278 , 0.699911 ] , [ 0.484849 , 0.67826 ] , [ 0.528814 , 0.620889 ] , [ 0.726369 , 0.079022 ] , [ 0.770114 , 0.021652 ] , [ 0.839258 , 0 ] , [ 0.839258 , - 0.5 ] ] ,
" T5 " : [ [ - 1.632126 , - 0.5 ] , [ - 1.632126 , 0 ] , [ - 1.568549 , 0.004939 ] , [ - 1.507539 , 0.019367 ] , [ - 1.450023 , 0.042686 ] , [ - 1.396912 , 0.074224 ] , [ - 1.349125 , 0.113379 ] , [ - 1.307581 , 0.159508 ] , [ - 1.273186 , 0.211991 ] , [ - 1.246868 , 0.270192 ] , [ - 1.009802 , 0.920362 ] , [ - 0.983414 , 0.978433 ] , [ - 0.949018 , 1.030788 ] , [ - 0.907524 , 1.076798 ] , [ - 0.859829 , 1.115847 ] , [ - 0.80682 , 1.147314 ] , [ - 0.749402 , 1.170562 ] , [ - 0.688471 , 1.184956 ] , [ - 0.624921 , 1.189895 ] , [ 0.624971 , 1.189895 ] , [ 0.688622 , 1.184956 ] , [ 0.749607 , 1.170562 ] , [ 0.807043 , 1.147314 ] , [ 0.860055 , 1.115847 ] , [ 0.907754 , 1.076798 ] , [ 0.949269 , 1.030788 ] , [ 0.9837 , 0.978433 ] , [ 1.010193 , 0.920362 ] , [ 1.246907 , 0.270192 ] , [ 1.273295 , 0.211991 ] , [ 1.307726 , 0.159508 ] , [ 1.349276 , 0.113379 ] , [ 1.397039 , 0.074224 ] , [ 1.450111 , 0.042686 ] , [ 1.507589 , 0.019367 ] , [ 1.568563 , 0.004939 ] , [ 1.632126 , 0 ] , [ 1.632126 , - 0.5 ] ] ,
" T10 " : [ [ - 3.06511 , - 1 ] , [ - 3.06511 , 0 ] , [ - 2.971998 , 0.007239 ] , [ - 2.882718 , 0.028344 ] , [ - 2.79859 , 0.062396 ] , [ - 2.720931 , 0.108479 ] , [ - 2.651061 , 0.165675 ] , [ - 2.590298 , 0.233065 ] , [ - 2.539962 , 0.309732 ] , [ - 2.501371 , 0.394759 ] , [ - 1.879071 , 2.105025 ] , [ - 1.840363 , 2.190052 ] , [ - 1.789939 , 2.266719 ] , [ - 1.729114 , 2.334109 ] , [ - 1.659202 , 2.391304 ] , [ - 1.581518 , 2.437387 ] , [ - 1.497376 , 2.47144 ] , [ - 1.408092 , 2.492545 ] , [ - 1.314979 , 2.499784 ] , [ 1.314979 , 2.499784 ] , [ 1.408091 , 2.492545 ] , [ 1.497371 , 2.47144 ] , [ 1.581499 , 2.437387 ] , [ 1.659158 , 2.391304 ] , [ 1.729028 , 2.334109 ] , [ 1.789791 , 2.266719 ] , [ 1.840127 , 2.190052 ] , [ 1.878718 , 2.105025 ] , [ 2.501018 , 0.394759 ] , [ 2.539726 , 0.309732 ] , [ 2.59015 , 0.233065 ] , [ 2.650975 , 0.165675 ] , [ 2.720887 , 0.108479 ] , [ 2.798571 , 0.062396 ] , [ 2.882713 , 0.028344 ] , [ 2.971997 , 0.007239 ] , [ 3.06511 , 0 ] , [ 3.06511 , - 1 ] ] ,
" AT5 " : [ [ - 2.134129 , - 0.75 ] , [ - 2.134129 , 0 ] , [ - 2.058023 , 0.005488 ] , [ - 1.984595 , 0.021547 ] , [ - 1.914806 , 0.047569 ] , [ - 1.849614 , 0.082947 ] , [ - 1.789978 , 0.127073 ] , [ - 1.736857 , 0.179338 ] , [ - 1.691211 , 0.239136 ] , [ - 1.653999 , 0.305859 ] , [ - 1.349199 , 0.959203 ] , [ - 1.286933 , 1.054635 ] , [ - 1.201914 , 1.127346 ] , [ - 1.099961 , 1.173664 ] , [ - 0.986896 , 1.18992 ] , [ 0.986543 , 1.18992 ] , [ 1.099614 , 1.173664 ] , [ 1.201605 , 1.127346 ] , [ 1.286729 , 1.054635 ] , [ 1.349199 , 0.959203 ] , [ 1.653646 , 0.305859 ] , [ 1.690859 , 0.239136 ] , [ 1.73651 , 0.179338 ] , [ 1.789644 , 0.127073 ] , [ 1.849305 , 0.082947 ] , [ 1.914539 , 0.047569 ] , [ 1.984392 , 0.021547 ] , [ 2.057906 , 0.005488 ] , [ 2.134129 , 0 ] , [ 2.134129 , - 0.75 ] ] ,
" HTD_3mm " : [ [ - 1.135062 , - 0.5 ] , [ - 1.135062 , 0 ] , [ - 1.048323 , 0.015484 ] , [ - 0.974284 , 0.058517 ] , [ - 0.919162 , 0.123974 ] , [ - 0.889176 , 0.206728 ] , [ - 0.81721 , 0.579614 ] , [ - 0.800806 , 0.653232 ] , [ - 0.778384 , 0.72416 ] , [ - 0.750244 , 0.792137 ] , [ - 0.716685 , 0.856903 ] , [ - 0.678005 , 0.918199 ] , [ - 0.634505 , 0.975764 ] , [ - 0.586483 , 1.029338 ] , [ - 0.534238 , 1.078662 ] , [ - 0.47807 , 1.123476 ] , [ - 0.418278 , 1.16352 ] , [ - 0.355162 , 1.198533 ] , [ - 0.289019 , 1.228257 ] , [ - 0.22015 , 1.25243 ] , [ - 0.148854 , 1.270793 ] , [ - 0.07543 , 1.283087 ] , [ - 0.000176 , 1.28905 ] , [ 0.075081 , 1.283145 ] , [ 0.148515 , 1.270895 ] , [ 0.219827 , 1.252561 ] , [ 0.288716 , 1.228406 ] , [ 0.354879 , 1.19869 ] , [ 0.418018 , 1.163675 ] , [ 0.477831 , 1.123623 ] , [ 0.534017 , 1.078795 ] , [ 0.586276 , 1.029452 ] , [ 0.634307 , 0.975857 ] , [ 0.677809 , 0.91827 ] , [ 0.716481 , 0.856953 ] , [ 0.750022 , 0.792167 ] , [ 0.778133 , 0.724174 ] , [ 0.800511 , 0.653236 ] , [ 0.816857 , 0.579614 ] , [ 0.888471 , 0.206728 ] , [ 0.919014 , 0.123974 ] , [ 0.974328 , 0.058517 ] , [ 1.048362 , 0.015484 ] , [ 1.135062 , 0 ] , [ 1.135062 , - 0.5 ] ] ,
" HTD_5mm " : [ [ - 1.89036 , - 0.75 ] , [ - 1.89036 , 0 ] , [ - 1.741168 , 0.02669 ] , [ - 1.61387 , 0.100806 ] , [ - 1.518984 , 0.21342 ] , [ - 1.467026 , 0.3556 ] , [ - 1.427162 , 0.960967 ] , [ - 1.398568 , 1.089602 ] , [ - 1.359437 , 1.213531 ] , [ - 1.310296 , 1.332296 ] , [ - 1.251672 , 1.445441 ] , [ - 1.184092 , 1.552509 ] , [ - 1.108081 , 1.653042 ] , [ - 1.024167 , 1.746585 ] , [ - 0.932877 , 1.832681 ] , [ - 0.834736 , 1.910872 ] , [ - 0.730271 , 1.980701 ] , [ - 0.62001 , 2.041713 ] , [ - 0.504478 , 2.09345 ] , [ - 0.384202 , 2.135455 ] , [ - 0.259708 , 2.167271 ] , [ - 0.131524 , 2.188443 ] , [ - 0.000176 , 2.198511 ] , [ 0.131296 , 2.188504 ] , [ 0.259588 , 2.167387 ] , [ 0.384174 , 2.135616 ] , [ 0.504527 , 2.093648 ] , [ 0.620123 , 2.04194 ] , [ 0.730433 , 1.980949 ] , [ 0.834934 , 1.911132 ] , [ 0.933097 , 1.832945 ] , [ 1.024398 , 1.746846 ] , [ 1.108311 , 1.653291 ] , [ 1.184308 , 1.552736 ] , [ 1.251865 , 1.445639 ] , [ 1.310455 , 1.332457 ] , [ 1.359552 , 1.213647 ] , [ 1.39863 , 1.089664 ] , [ 1.427162 , 0.960967 ] , [ 1.467026 , 0.3556 ] , [ 1.518984 , 0.21342 ] , [ 1.61387 , 0.100806 ] , [ 1.741168 , 0.02669 ] , [ 1.89036 , 0 ] , [ 1.89036 , - 0.75 ] ] ,
" HTD_8mm " : [ [ - 3.301471 , - 1 ] , [ - 3.301471 , 0 ] , [ - 3.16611 , 0.012093 ] , [ - 3.038062 , 0.047068 ] , [ - 2.919646 , 0.10297 ] , [ - 2.813182 , 0.177844 ] , [ - 2.720989 , 0.269734 ] , [ - 2.645387 , 0.376684 ] , [ - 2.588694 , 0.496739 ] , [ - 2.553229 , 0.627944 ] , [ - 2.460801 , 1.470025 ] , [ - 2.411413 , 1.691917 ] , [ - 2.343887 , 1.905691 ] , [ - 2.259126 , 2.110563 ] , [ - 2.158035 , 2.30575 ] , [ - 2.041518 , 2.490467 ] , [ - 1.910478 , 2.66393 ] , [ - 1.76582 , 2.825356 ] , [ - 1.608446 , 2.973961 ] , [ - 1.439261 , 3.10896 ] , [ - 1.259169 , 3.22957 ] , [ - 1.069074 , 3.335006 ] , [ - 0.869878 , 3.424485 ] , [ - 0.662487 , 3.497224 ] , [ - 0.447804 , 3.552437 ] , [ - 0.226732 , 3.589341 ] , [ - 0.000176 , 3.607153 ] , [ 0.226511 , 3.589461 ] , [ 0.447712 , 3.552654 ] , [ 0.66252 , 3.497516 ] , [ 0.870027 , 3.424833 ] , [ 1.069329 , 3.33539 ] , [ 1.259517 , 3.229973 ] , [ 1.439687 , 3.109367 ] , [ 1.608931 , 2.974358 ] , [ 1.766344 , 2.825731 ] , [ 1.911018 , 2.664271 ] , [ 2.042047 , 2.490765 ] , [ 2.158526 , 2.305998 ] , [ 2.259547 , 2.110755 ] , [ 2.344204 , 1.905821 ] , [ 2.411591 , 1.691983 ] , [ 2.460801 , 1.470025 ] , [ 2.553229 , 0.627944 ] , [ 2.588592 , 0.496739 ] , [ 2.645238 , 0.376684 ] , [ 2.720834 , 0.269734 ] , [ 2.81305 , 0.177844 ] , [ 2.919553 , 0.10297 ] , [ 3.038012 , 0.047068 ] , [ 3.166095 , 0.012093 ] , [ 3.301471 , 0 ] , [ 3.301471 , - 1 ] ] ,
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" GT2_2mm " : mirrorx ( [ [ 0.747183 , - 0.5 ] , [ 0.747183 , 0 ] , [ 0.647876 , 0.037218 ] , [ 0.598311 , 0.130528 ] , [ 0.578556 , 0.238423 ] , [ 0.547158 , 0.343077 ] , [ 0.504649 , 0.443762 ] , [ 0.451556 , 0.53975 ] , [ 0.358229 , 0.636924 ] , [ 0.2484 , 0.707276 ] , [ 0.127259 , 0.750044 ] , [ 0 , 0.76447 ] , [ - 0.127259 , 0.750044 ] , [ - 0.2484 , 0.707276 ] , [ - 0.358229 , 0.636924 ] , [ - 0.451556 , 0.53975 ] , [ - 0.504797 , 0.443762 ] , [ - 0.547291 , 0.343077 ] , [ - 0.578605 , 0.238423 ] , [ - 0.598311 , 0.130528 ] , [ - 0.648009 , 0.037218 ] , [ - 0.747183 , 0 ] , [ - 0.747183 , - 0.5 ] ] ) ,
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" GT2_3mm " : [ [ - 1.155171 , - 0.5 ] , [ - 1.155171 , 0 ] , [ - 1.065317 , 0.016448 ] , [ - 0.989057 , 0.062001 ] , [ - 0.93297 , 0.130969 ] , [ - 0.90364 , 0.217664 ] , [ - 0.863705 , 0.408181 ] , [ - 0.800056 , 0.591388 ] , [ - 0.713587 , 0.765004 ] , [ - 0.60519 , 0.926747 ] , [ - 0.469751 , 1.032548 ] , [ - 0.320719 , 1.108119 ] , [ - 0.162625 , 1.153462 ] , [ 0 , 1.168577 ] , [ 0.162625 , 1.153462 ] , [ 0.320719 , 1.108119 ] , [ 0.469751 , 1.032548 ] , [ 0.60519 , 0.926747 ] , [ 0.713587 , 0.765004 ] , [ 0.800056 , 0.591388 ] , [ 0.863705 , 0.408181 ] , [ 0.90364 , 0.217664 ] , [ 0.932921 , 0.130969 ] , [ 0.988924 , 0.062001 ] , [ 1.065168 , 0.016448 ] , [ 1.155171 , 0 ] , [ 1.155171 , - 0.5 ] ] ,
" GT2_5mm " : [ [ - 1.975908 , - 0.75 ] , [ - 1.975908 , 0 ] , [ - 1.797959 , 0.03212 ] , [ - 1.646634 , 0.121224 ] , [ - 1.534534 , 0.256431 ] , [ - 1.474258 , 0.426861 ] , [ - 1.446911 , 0.570808 ] , [ - 1.411774 , 0.712722 ] , [ - 1.368964 , 0.852287 ] , [ - 1.318597 , 0.989189 ] , [ - 1.260788 , 1.123115 ] , [ - 1.195654 , 1.25375 ] , [ - 1.12331 , 1.380781 ] , [ - 1.043869 , 1.503892 ] , [ - 0.935264 , 1.612278 ] , [ - 0.817959 , 1.706414 ] , [ - 0.693181 , 1.786237 ] , [ - 0.562151 , 1.851687 ] , [ - 0.426095 , 1.9027 ] , [ - 0.286235 , 1.939214 ] , [ - 0.143795 , 1.961168 ] , [ 0 , 1.9685 ] , [ 0.143796 , 1.961168 ] , [ 0.286235 , 1.939214 ] , [ 0.426095 , 1.9027 ] , [ 0.562151 , 1.851687 ] , [ 0.693181 , 1.786237 ] , [ 0.817959 , 1.706414 ] , [ 0.935263 , 1.612278 ] , [ 1.043869 , 1.503892 ] , [ 1.123207 , 1.380781 ] , [ 1.195509 , 1.25375 ] , [ 1.26065 , 1.123115 ] , [ 1.318507 , 0.989189 ] , [ 1.368956 , 0.852287 ] , [ 1.411872 , 0.712722 ] , [ 1.447132 , 0.570808 ] , [ 1.474611 , 0.426861 ] , [ 1.534583 , 0.256431 ] , [ 1.646678 , 0.121223 ] , [ 1.798064 , 0.03212 ] , [ 1.975908 , 0 ] , [ 1.975908 , - 0.75 ] ] ,
}
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def __init__ ( self , boxes ) :
self . boxes = boxes
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@classmethod
def getProfiles ( cls ) :
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return list ( sorted ( cls . teeth . keys ( ) ) )
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def drawPoints ( self , lines , kerfdir = 1 ) :
if kerfdir != 0 :
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lines = kerf ( lines , self . boxes . burn * kerfdir )
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self . boxes . ctx . save ( )
self . boxes . ctx . move_to ( * lines [ 0 ] )
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for x , y in lines [ 1 : ] :
self . boxes . ctx . line_to ( x , y )
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self . boxes . ctx . line_to ( * lines [ 0 ] )
self . boxes . ctx . restore ( )
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def diameter ( self , teeth , profile ) :
if self . spacing [ profile ] [ 0 ] :
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return tooth_spaceing_curvefit ( teeth , * self . spacing [ profile ] [ 1 : ] )
return tooth_spacing ( teeth , * self . spacing [ profile ] [ 1 : ] )
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def __call__ ( self , teeth , profile , insideout = False , r_axle = None ,
callback = None , move = " " ) :
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# ********************************
# ** Scaling tooth for good fit **
# ********************************
# To improve fit of belt to pulley, set the following constant. Decrease or increase by 0.1mm at a time. We are modelling the *BELT* tooth here, not the tooth on the pulley. Increasing the number will *decrease* the pulley tooth size. Increasing the tooth width will also scale proportionately the tooth depth, to maintain the shape of the tooth, and increase how far into the pulley the tooth is indented. Can be negative
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additional_tooth_width = 0.2 # mm
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# If you need more tooth depth than this provides, adjust the following constant. However, this will cause the shape of the tooth to change.
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additional_tooth_depth = 0 # mm
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pulley_OD = self . diameter ( teeth , profile )
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tooth_depth , tooth_width = self . profile_data [ profile ]
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tooth_distance_from_centre = ( ( pulley_OD / 2 ) * * 2 - ( ( tooth_width + additional_tooth_width ) / 2 ) * * 2 ) * * 0.5
tooth_width_scale = ( tooth_width + additional_tooth_width ) / tooth_width
tooth_depth_scale = ( ( tooth_depth + additional_tooth_depth ) / tooth_depth )
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if insideout :
pulley_OD + = 2 * tooth_depth * tooth_depth_scale
tooth_depth_scale * = - 1
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total_width = max ( pulley_OD , 2 * ( r_axle or 0.0 ) )
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if self . boxes . move ( total_width , total_width , move , before = True ) :
return
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self . boxes . moveTo ( total_width / 2 , total_width / 2 )
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self . boxes . cc ( callback , None , 0.0 , 0.0 )
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if r_axle :
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if insideout :
self . boxes . circle ( 0 , 0 , r_axle )
else :
self . boxes . hole ( 0 , 0 , r_axle )
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points = [ ]
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for i in range ( teeth ) :
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m = [ [ tooth_width_scale , 0 , 0 ] ,
[ 0 , tooth_depth_scale , - tooth_distance_from_centre ] ]
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m = mmul ( m , rotm ( i * 2 * pi / teeth ) )
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points . extend ( ( vtransl ( pt , m ) for pt in self . teeth [ profile ] [ 1 : - 1 ] ) )
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self . drawPoints ( points , kerfdir = - 1 if insideout else 1 )
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self . boxes . move ( total_width , total_width , move )