Timing pulley diameter calculator.xls
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T2.5 (.098") Pitch Pulley Dimensions
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Tooth pitch =
2.5mm
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Pitch line offset =
0.2609mm
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From http://www.sdp-si.com/
Calculated using curvefit
Calculated using tooth pitch and line offset
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Pitch DiameterOutside Diameter
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No of grooves (teeth)InchmmInchmmOutside Diameter / Grooves (mm)Accurate OD / Grooves (curvefit)Simplified OD / Grooves (curvefit)Simplified OD (mm)Simplified difference from actualDiameter (calculated)Diameter (calculated) / GroovesCalculated diameter difference from actual
11
87.31E-010.73133186715.85-5.85075.840.73054971555.8444
12
97.38E-010.73815807836.64-6.64346.640.73779693776.6402
13
100.3178.050.2937.450.7457.44E-010.74369524687.440.01307.440.7435947155-0.0141
14
110.3488.850.3258.250.757.48E-010.74827576918.230.01908.230.7483383518-0.0183
15
120.3789.60.35490.757.52E-010.75212699629.03-0.02559.030.75229138210.0275
16
130.40910.40.3869.80.75384615387.55E-010.75540964969.82-0.02039.820.75563625390.0233
17
140.44111.20.41710.60.75714285717.58E-010.75824053910.62-0.015410.620.75850328690.0190
18
150.472120.44911.40.767.61E-010.76070658411.41-0.010611.410.76098804880.0148
19
160.50412.80.4812.20.76257.63E-010.762873790512.21-0.006012.210.76316221550.0106
20
170.53513.60.512130.76470588247.65E-010.764793176713.00-0.001513.010.76508059780.0064
21
180.56714.40.54313.80.76666666677.66E-010.766504793813.800.002913.800.76678582660.0021
22
190.59815.20.57514.60.76842105267.68E-010.7680405214.590.007214.600.7683115576-0.0021
23
200.63160.60615.40.777.69E-010.769426041215.390.011515.390.7696847155-0.0063
24
210.66116.80.63816.20.77142857147.71E-010.770682283616.180.015716.190.7709270964-0.0105
25
220.69317.60.669170.77272727277.72E-010.771826465916.980.019816.990.7720565336-0.0148
26
230.72418.40.70117.80.77391304357.73E-010.772872884917.780.023917.780.7730877589-0.0190
27
240.75419.150.7318.550.77291666677.74E-010.77383350918.57-0.022018.580.77403304880.0268
28
250.78519.950.76219.350.7747.75E-010.774718433519.37-0.018019.370.77490271550.0226
29
260.81720.750.79320.150.7757.76E-010.775536232720.16-0.013920.170.77570548470.0183
30
270.84821.550.82520.950.77592592597.76E-010.776294235420.96-0.009920.960.77644878950.0141
31
280.8822.350.85621.750.77678571437.77E-010.776998743221.76-0.006021.760.77713900120.0099
32
290.91123.150.88822.550.77758620697.78E-010.777655203922.55-0.002022.560.7777816120.0057
33
300.94323.950.91923.350.77833333337.78E-010.778268351523.350.001923.350.77838138210.0014
34
310.97424.750.95124.150.77903225817.79E-010.778842318824.140.005924.150.7789424574-0.0028
35
321.00625.550.98224.950.77968757.79E-010.779380730224.940.009824.940.7794684655-0.0070
36
331.03726.351.01425.750.78030303037.80E-010.779886777425.740.013725.740.7799625942-0.0112
37
341.06927.151.04526.550.78088235297.80E-010.780363281826.530.017626.530.7804276566-0.0155
38
351.127.951.07727.350.78142857147.81E-010.780812746827.330.021627.330.780866144-0.0197
39
361.13228.751.10828.150.78194444447.81E-010.781237401428.120.025528.130.781280271-0.0239
40
371.16129.51.13828.90.78108108117.82E-010.781639236428.92-0.020728.920.78167201280.0219
41
381.19330.31.16929.70.78157894747.82E-010.782020035729.72-0.016829.720.78204313650.0176
42
391.22431.11.20130.50.78205128217.82E-010.782381402530.51-0.012930.510.78239522830.0134
43
401.25631.91.23231.30.78257.83E-010.782724781331.31-0.009031.310.78272971550.0092
44
411.28732.71.26432.10.78292682937.83E-010.783051477232.11-0.005132.100.78304788620.0050
45
421.31933.51.29532.90.78333333337.83E-010.783362672132.90-0.001232.900.78335090590.0007
46
431.3534.31.32733.70.78372093027.84E-010.783659439533.700.002633.700.7836398317-0.0035
47
441.38235.11.35834.50.78409090917.84E-010.783942755834.490.006534.490.7839156246-0.0077
48
451.41335.91.3935.30.78444444447.84E-010.784213511635.290.010435.290.7841791599-0.0119
49
461.44536.71.42136.10.78478260877.84E-010.784472520736.090.014336.080.7844312372-0.0162
50
471.47637.51.45336.90.7851063837.85E-010.784720528236.880.018136.880.7846725878-0.0204
51
481.50838.31.48437.70.78541666677.85E-010.784958217737.680.022037.680.7849038821-0.0246
52
491.53739.051.51438.450.78469387767.85E-010.785186217238.47-0.024138.470.78512573590.0212
53
501.56939.851.54539.250.7857.85E-010.785405105239.27-0.020339.270.78533871550.0169
54
511.640.651.57740.050.78529411767.86E-010.78561541540.07-0.016440.060.78554334290.0127
55
521.63241.451.60840.850.78557692317.86E-010.785817638940.86-0.012540.860.78574010010.0085
56
531.66342.251.6441.650.78584905667.86E-010.786012232741.66-0.008641.650.78592943240.0043
57
541.69543.051.67142.450.78611111117.86E-010.786199618542.45-0.004842.450.78611175250.0000
MMF Model: y=(a*b+c*x^d)/(b+x^d)
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551.72643.851.70343.250.78636363647.86E-010.786380187843.25-0.000943.250.7862874427-0.0042
Coefficient Data:
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561.75844.651.73444.050.78660714297.87E-010.786554304444.050.003044.040.7864568583-0.0084AccurateSimplified
60
571.78945.451.76644.850.78684210537.87E-010.786722306744.840.006844.840.7866203295-0.0126a =5.83E-070
61
581.82146.251.79745.650.78706896557.87E-010.786884509945.640.010745.630.7867781637-0.0169b =7.47E-010.7467
62
591.85247.051.82946.450.78728813567.87E-010.787041207946.440.014646.430.7869306477-0.0211c =7.96E-010.796
63
601.88447.851.8647.250.78757.87E-010.787192675247.230.018447.220.7870780488-0.0253d =1.03E+001.026
64
611.91548.651.89248.050.7877049187.87E-010.787339168348.030.022348.020.7872206171-0.0295
65
621.94549.41.92148.80.78709677427.87E-010.787480927348.82-0.023848.820.78735858640.0162
66
631.97650.21.95349.60.78730158737.88E-010.787618177149.62-0.019949.610.78749217580.0120
67
642.008511.98450.40.78757.88E-010.787751128650.42-0.016150.410.78762159050.0078
68
652.03951.82.01651.20.78769230777.88E-010.787879979751.21-0.012251.200.78774702320.0036
69
662.07152.62.047520.78787878797.88E-010.788004916652.01-0.008352.000.7878686549-0.0007
70
672.10253.42.07952.80.78805970157.88E-010.78812611452.80-0.004452.800.7879866558-0.0049
71
682.13454.22.1153.60.78823529417.88E-010.788243736853.60-0.000653.590.788101186-0.0091
72
692.165552.14254.40.78840579717.88E-010.788357940254.400.003354.390.7882123966-0.0133
73
702.19755.82.17355.20.78857142867.88E-010.788468870555.190.007255.180.7883204297-0.0176
74
712.22856.62.205560.78873239447.89E-010.788576665955.990.011155.980.7884254197-0.0218
75
722.2657.42.23656.80.78888888897.89E-010.788681456856.790.014956.770.7885274932-0.0260
76
732.29158.22.26857.60.78904109597.89E-010.788783366757.580.018857.570.7886267703-0.0302
77
742.32158.952.29758.350.78851351357.89E-010.788882512158.38-0.027358.370.78872336410.0155
78
752.35259.752.32959.150.78866666677.89E-010.788979003859.17-0.023459.160.78881738210.0113
79
762.38460.552.3659.950.78881578957.89E-010.789072946259.97-0.019559.960.7889089260.0071
80
772.41561.352.39260.750.7889610397.89E-010.789164438860.77-0.015760.750.78899809210.0029
81
782.44762.152.42361.550.78910256417.89E-010.789253575861.56-0.011861.550.7890849719-0.0014
82
792.47862.952.45562.350.78924050637.89E-010.789340446562.36-0.007962.340.7891696522-0.0056
83
802.5163.752.48663.150.7893757.89E-010.78942513663.15-0.004063.140.7892522155-0.0098
84
812.54164.552.51863.950.78950617287.89E-010.78950772563.95-0.000163.940.7893327402-0.0140
85
822.57365.352.54964.750.78963414637.90E-010.789588290564.750.003864.730.7894113008-0.0183
86
832.60466.152.58165.550.78975903617.90E-010.789666905565.540.007665.530.7894879685-0.0225
87
842.63666.952.61266.350.78988095247.90E-010.789743639966.340.011566.320.7895628107-0.0267
88
852.66767.752.64467.150.797.90E-010.789818559967.130.015467.120.7896358919-0.0309
89
862.69968.552.67567.950.79011627917.90E-010.789891728967.930.019367.910.7897072736-0.0352
90
872.72869.32.70568.70.78965517247.90E-010.789963207368.73-0.026868.710.78977701430.0106
91
882.7670.12.73669.50.78977272737.90E-010.790033052969.52-0.022969.510.789845170.0064
92
892.79170.92.76870.30.78988764047.90E-010.790101320670.32-0.019070.300.78991179410.0021
93
902.82371.72.79971.10.797.90E-010.790168063271.12-0.015171.100.7899769377-0.0021
94
912.85472.52.83171.90.79010989017.90E-010.79023333171.91-0.011271.890.7900406495-0.0063
95
922.88673.32.86272.70.79021739137.90E-010.790297172172.71-0.007372.690.7901029763-0.0105
96
932.91774.12.89473.50.79032258067.90E-010.790359632673.50-0.003473.490.7901639628-0.0148
97
942.94974.92.92574.30.79042553197.90E-010.790420756674.300.000474.280.7902236516-0.0190
98
952.9875.72.95775.10.79052631587.90E-010.790480586475.100.004375.080.7902820839-0.0232
99
963.01276.52.98875.90.7906257.91E-010.790539162575.890.008275.870.7903392988-0.0274
100
973.04377.33.0276.70.79072164957.91E-010.790596523776.690.012176.670.790395334-0.0317
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