I just read the code you posted. My opinion now is that these modeled pulleys are "good enough" if you print them on a machine that has 0.1mm accuracy. Belts are made of rubber and will work if the fit is even close.
But real pulleys you buy have better tooth profiles. I'm reading about GT3 teeth and the commercial pulleys are not just 0.2mm bigger groves than the belt teeth. The OpenScad model is using an approximate shape. The real ones you buy have exactly ZERO clearance at the bottom of the groove that tapers to some thousanths clearance at the top. There is literally zero backlash. I still say it is best to download teeth and gear profiles from the manufacturer's web site. These files capture an actual real-world product. I'm using this to build a CNC machine so I'm thinking about how the tooth profile error effects the parts my CNC machine will make. Worst case is well under 0.001 inches so it goes unnoticed. Mini mills have worse problems. But others might care about 0.2mm tooth profile errors. In a day or so I will compare the openscad moded part to the part model I get from SPD/SI. I can subtract one solid from the other and end up with a thin film that is the difference. Then blow up a section of that film and look. On Fri, Jun 5, 2020 at 11:11 AM Martin Dobbins <[email protected]> wrote: > Changed the subject :-) > > Gene Heskett wrote: > > >Now, looking at the sprocket code in openscad, it will not render a > >motor shaft over 9.9mm, using this line of code, no clue what language > >this is, but its a .scad file, part of the parametric pulley kit. > > >translate([0,0,-1])cylinder(r=motor_shaft/2,h=pulley_b_ht + pulley_t_ht + > retainer_ht + 2,$fn=motor_shaft*4); > > I have to remind you, I am: > > 1;total noob on openscad > 2;clueless on 3d printing > > It makes sense to me to start with the openscad drawing (you do have > openscad installed?) to generate the .stl files that the slicer (Cura or > slic3r) eat. I ask because featured on that thingiverse page are 14 .stl > files that you can feed direct to slicer, 1 .xls file that you can do some > microsoftey spreadsheet thing with and 1 .scad file which (I will take a > wild guess) is a native openscad file. I think if you use this to render > and save the .stl files for the slicer, life might be easier. Your motor > shaft size is limited by the parameters you show above all of these are > listed at the top of the scad program as "tuneable constants" at the top > you can change them to fit your use case and have any motor shaft you need. > > > It looks like this: > > // 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 > > /** > * @name Pulley > * @category Printed > * @using 1 x m3 nut, normal or nyloc > * @using 1 x m3x10 set screw or 1 x m3x8 grub screw > */ > > > // tuneable constants > > teeth = 8; // Number of teeth, standard Mendel T5 belt = 8, gives Outside > Diameter of 11.88mm > profile = 6; // 1=MXL 2=40DP 3=XL 4=H 5=T2.5 6=T5 7=T10 8=AT5 9=HTD_3mm > 10=HTD_5mm 11=HTD_8mm 12=GT2_2mm 13=GT2_3mm 14=GT2_5mm > > motor_shaft = 5.2; // NEMA17 motor shaft exact diameter = 5 > m3_dia = 3.2; // 3mm hole diameter > m3_nut_hex = 1; // 1 for hex, 0 for square nut > m3_nut_flats = 5.7; // normal M3 hex nut exact width = 5.5 > m3_nut_depth = 2.7; // normal M3 hex nut exact depth = 2.4, nyloc = 4 > > retainer = 0; // Belt retainer above teeth, 0 = No, 1 = Yes > retainer_ht = 1.5; // height of retainer flange over pulley, standard = 1.5 > idler = 0; // Belt retainer below teeth, 0 = No, 1 = Yes > idler_ht = 1.5; // height of idler flange over pulley, standard = 1.5 > > pulley_t_ht = 12; // length of toothed part of pulley, standard = 12 > pulley_b_ht = 8; // pulley base height, standard = 8. Set to same as > idler_ht if you want an idler but no pulley. > pulley_b_dia = 20; // pulley base diameter, standard = 20 > no_of_nuts = 1; // number of captive nuts required, standard = 1 > nut_angle = 90; // angle between nuts, standard = 90 > nut_shaft_distance = 1.2; // distance between inner face of nut and shaft, > can be negative. > > > // ******************************** > // ** 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 */ > > additional_tooth_width = 0.2; //mm > > // If you need more tooth depth than this provides, adjust the following > constant. However, this will cause the shape of the tooth to change. > > additional_tooth_depth = 0; //mm > > // calculated constants > > nut_elevation = pulley_b_ht/2; > m3_nut_points = 2*((m3_nut_flats/2)/cos(30)); // This is needed for the > nut trap > > // The following set the pulley diameter for a given number of teeth > > MXL_pulley_dia = tooth_spacing (2.032,0.254); > 40DP_pulley_dia = tooth_spacing (2.07264,0.1778); > XL_pulley_dia = tooth_spacing (5.08,0.254); > H_pulley_dia = tooth_spacing (9.525,0.381); > T2_5_pulley_dia = tooth_spaceing_curvefit (0.7467,0.796,1.026); > T5_pulley_dia = tooth_spaceing_curvefit (0.6523,1.591,1.064); > T10_pulley_dia = tooth_spacing (10,0.93); > AT5_pulley_dia = tooth_spaceing_curvefit (0.6523,1.591,1.064); > HTD_3mm_pulley_dia = tooth_spacing (3,0.381); > HTD_5mm_pulley_dia = tooth_spacing (5,0.5715); > HTD_8mm_pulley_dia = tooth_spacing (8,0.6858); > GT2_2mm_pulley_dia = tooth_spacing (2,0.254); > GT2_3mm_pulley_dia = tooth_spacing (3,0.381); > GT2_5mm_pulley_dia = tooth_spacing (5,0.5715); > > // The following calls the pulley creation part, and passes the pulley > diameter and tooth width to that module > > if ( profile == 1 ) { pulley ( "MXL" , MXL_pulley_dia , 0.508 , 1.321 ); } > if ( profile == 2 ) { pulley ( "40 D.P." , 40DP_pulley_dia , 0.457 , 1.226 > ); } > if ( profile == 3 ) { pulley ( "XL" , XL_pulley_dia , 1.27, 3.051 ); } > if ( profile == 4 ) { pulley ( "H" , H_pulley_dia ,1.905 , 5.359 ); } > if ( profile == 5 ) { pulley ( "T2.5" , T2_5_pulley_dia , 0.7 , 1.678 ); } > if ( profile == 6 ) { pulley ( "T5" , T5_pulley_dia , 1.19 , 3.264 ); } > if ( profile == 7 ) { pulley ( "T10" , T10_pulley_dia , 2.5 , 6.13 ); } > if ( profile == 8 ) { pulley ( "AT5" , AT5_pulley_dia , 1.19 , 4.268 ); } > if ( profile == 9 ) { pulley ( "HTD 3mm" , HTD_3mm_pulley_dia , 1.289 , > 2.27 ); } > if ( profile == 10 ) { pulley ( "HTD 5mm" , HTD_5mm_pulley_dia , 2.199 , > 3.781 ); } > if ( profile == 11 ) { pulley ( "HTD 8mm" , HTD_8mm_pulley_dia , 3.607 , > 6.603 ); } > if ( profile == 12 ) { pulley ( "GT2 2mm" , GT2_2mm_pulley_dia , 0.764 , > 1.494 ); } > if ( profile == 13 ) { pulley ( "GT2 3mm" , GT2_3mm_pulley_dia , 1.169 , > 2.31 ); } > if ( profile == 14 ) { pulley ( "GT2 5mm" , GT2_5mm_pulley_dia , 1.969 , > 3.952 ); } > > // Functions > > function tooth_spaceing_curvefit (b,c,d) > = ((c * pow(teeth,d)) / (b + pow(teeth,d))) * teeth ; > > function tooth_spacing(tooth_pitch,pitch_line_offset) > = (2*((teeth*tooth_pitch)/(3.14159265*2)-pitch_line_offset)) ; > > // Main Module > > module pulley( belt_type , pulley_OD , tooth_depth , tooth_width ) > { > echo (str("Belt type = ",belt_type,"; Number of teeth = ",teeth,"; Pulley > Outside Diameter = ",pulley_OD,"mm ")); > tooth_distance_from_centre = sqrt( pow(pulley_OD/2,2) - > pow((tooth_width+additional_tooth_width)/2,2)); > tooth_width_scale = (tooth_width + additional_tooth_width ) / tooth_width; > tooth_depth_scale = ((tooth_depth + additional_tooth_depth ) / > tooth_depth) ; > > > // ************************************************************************ > // *** uncomment the following line if pulley is wider than puller base *** > // ************************************************************************ > > // translate ([0,0, pulley_b_ht + pulley_t_ht + retainer_ht ]) rotate > ([0,180,0]) > > difference() > { > union() > { > //base > > if ( pulley_b_ht < 2 ) { echo ("CAN'T DRAW PULLEY BASE, HEIGHT LESS THAN > 2!!!"); } else { > rotate_extrude($fn=pulley_b_dia*2) > { > square([pulley_b_dia/2-1,pulley_b_ht]); > square([pulley_b_dia/2,pulley_b_ht-1]); > translate([pulley_b_dia/2-1,pulley_b_ht-1]) circle(1); > } > } > > difference() > { > //shaft - diameter is outside diameter of pulley > > translate([0,0,pulley_b_ht]) > rotate ([0,0,360/(teeth*4)]) > cylinder(r=pulley_OD/2,h=pulley_t_ht, $fn=teeth*4); > > //teeth - cut out of shaft > > for(i=[1:teeth]) > rotate([0,0,i*(360/teeth)]) > translate([0,-tooth_distance_from_centre,pulley_b_ht -1]) > scale ([ tooth_width_scale , tooth_depth_scale , 1 ]) > { > if ( profile == 1 ) { MXL();} > if ( profile == 2 ) { 40DP();} > if ( profile == 3 ) { XL();} > if ( profile == 4 ) { H();} > if ( profile == 5 ) { T2_5();} > if ( profile == 6 ) { T5();} > if ( profile == 7 ) { T10();} > if ( profile == 8 ) { AT5();} > if ( profile == 9 ) { HTD_3mm();} > if ( profile == 10 ) { HTD_5mm();} > if ( profile == 11 ) { HTD_8mm();} > if ( profile == 12 ) { GT2_2mm();} > if ( profile == 13 ) { GT2_3mm();} > if ( profile == 14 ) { GT2_5mm();} > } > > } > > //belt retainer / idler > if ( retainer > 0 ) {translate ([0,0, pulley_b_ht + pulley_t_ht ]) > rotate_extrude($fn=teeth*4) > polygon([[0,0],[pulley_OD/2,0],[pulley_OD/2 + retainer_ht , > retainer_ht],[0 , retainer_ht],[0,0]]);} > > if ( idler > 0 ) {translate ([0,0, pulley_b_ht - idler_ht ]) > rotate_extrude($fn=teeth*4) > polygon([[0,0],[pulley_OD/2 + idler_ht,0],[pulley_OD/2 , idler_ht],[0 , > idler_ht],[0,0]]);} > > } > > //hole for motor shaft > translate([0,0,-1])cylinder(r=motor_shaft/2,h=pulley_b_ht + pulley_t_ht + > retainer_ht + 2,$fn=motor_shaft*4); > > //captive nut and grub screw holes > > if ( pulley_b_ht < m3_nut_flats ) { echo ("CAN'T DRAW CAPTIVE NUTS, HEIGHT > LESS THAN NUT DIAMETER!!!"); } else { > if ( (pulley_b_dia - motor_shaft)/2 < m3_nut_depth + 3 ) { echo ("CAN'T > DRAW CAPTIVE NUTS, DIAMETER TOO SMALL FOR NUT DEPTH!!!"); } else { > > for(j=[1:no_of_nuts]) rotate([0,0,j*nut_angle]) > translate([0,0,nut_elevation])rotate([90,0,0]) > > union() > { > //entrance > translate([0,-pulley_b_ht/4-0.5,motor_shaft/2+m3_nut_depth/2+nut_shaft_distance]) > cube([m3_nut_flats,pulley_b_ht/2+1,m3_nut_depth],center=true); > > //nut > if ( m3_nut_hex > 0 ) > { > // hex nut > translate([0,0.25,motor_shaft/2+m3_nut_depth/2+nut_shaft_distance]) > rotate([0,0,30]) > cylinder(r=m3_nut_points/2,h=m3_nut_depth,center=true,$fn=6); > } else { > // square nut > translate([0,0.25,motor_shaft/2+m3_nut_depth/2+nut_shaft_distance]) > cube([m3_nut_flats,m3_nut_flats,m3_nut_depth],center=true); > } > > //grub screw hole > rotate([0,0,22.5])cylinder(r=m3_dia/2,h=pulley_b_dia/2+1,$fn=8); > } > }} > } > > } > > > // Tooth profile modules > > module MXL() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module 40DP() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module XL() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module H() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module T2_5() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module T5() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module T10() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module AT5() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module HTD_3mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module HTD_5mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module HTD_8mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module GT2_2mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[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]]); > } > > module GT2_3mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > module GT2_5mm() > { > linear_extrude(height=pulley_t_ht+2) > polygon([[-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]]); > } > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
