The program below is in EXCEL. Macro's can be disabled for this one
Email me for the program
mailto:mikebull@blueyonder.co.ukNote, Although I have checked these programs I accept no responsibility for any calculations, drawings or parts manufactured to them.
No.3 - Geometry program for a single gear
, just input the known parameters in red and the rest will be calculated by the program. Figures in blue are optional|
geom single - READ THE HELP SHEET FIRST - do not overwrite any black figures, they contain formulae |
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All dims in mm |
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Feature |
Cell name |
input / calc |
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INPUT REQUIRED IN RED |
calculated angles in this col in radians |
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No. of teeth |
pin |
26 |
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normal module |
mn |
5 |
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normal pressure angle (deg) |
npa |
20 |
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helix angle (deg) |
ha |
15 |
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normal pressure angle (rad) |
npar |
0.34906585 |
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helix angle (rad) |
har |
0.261799388 |
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Facewidth |
b |
100 |
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inspection pin/ball dia |
pind |
8.4 |
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normal circular pitch |
pn |
15.708 |
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trans circ pitch |
pt |
16.262 |
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trans base pitch |
pbt |
15.218 |
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addendum mod coefficient |
admod1 |
0.5 |
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topping (per side) |
top1 |
0 |
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nominal cutter tooth depth ( 2.25 Mn ) |
td |
2.25 |
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cutter tip radius |
tr |
1 |
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cutter depth from PL to start of rad |
sr |
5.592 |
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Tooth thinning ( for backlash with mate) min |
0.1 |
0.1 |
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max |
0.15 |
0.15 |
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MANUFACTURING DETAILS |
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ref dia (pcd) |
rd1 |
134.586 |
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addendum |
add1 |
7.500 |
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tip dia |
td1 |
149.586 |
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root dia |
rt1 |
127.086 |
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trans pressure angle |
pat |
0.360356324 |
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involute pat |
ipat |
0.01645339 |
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base circle dia. |
bcd1 |
125.942 |
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thk n @ rd |
sn1 |
9.674 |
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base helix angle |
bha |
0.245674211 |
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Lead |
pz |
1577.964 |
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Axial pitch |
px |
60.691 |
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Additional Geometry Details |
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Overlap ratio, based on facewidth |
1.648 |
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