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# Helical gear

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carlosban71
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Post Options    Thanks(0)    Quote  Reply Topic: Helical gear
Posted: 02.Mar.2020 at 16:47
Apply these formulas,
Is this formula good for this type of gear?
I would like to know the calculation why they are of the Gleason type, otherwise I need data and I also calculate the formulas

N=NUMBER OF TEETH
DE=EXTERNAL DIAMETER

Formulas
M= Module= DE/N+2
Dp= Primitive Diameter= M x N
CT= Plot Diameter = 0.96592 x Dp
P= Diametral passage= M x Pi
Di= Internal diameter = Dp-(2M x 1.167)
R1 = Tooth tracing 0.07 x Dp
R2 = Tooth tracing  0.22 x Dp
R3 = Tooth tracing  0.33 x Dp
R4 = Tooth tracing detalle 0.3 x M
Franco's Angle = 90 £/ N

Edited by carlosban71 - 03.Mar.2020 at 01:34
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 03.Mar.2020 at 07:55

Hello carlosban71, please tell us if you want to draw an APPROXIMATE 3D model of it or the real one.
If it's an approximate model I'm afraid it's already going to be difficult but if I had to do this I would base my concept on the image here enclosed that is the calculation for : CYLINDRICAL STRAIT CUT GEARS and try to make them conical and helical!!!
I give you this extract of an EXCEL file of mine that I use to draw gears but it's only giving the general dimensions; what is missing is the ' radius' ( because it's not a radius but a 'developpante de cercle' in french ) of the sides of the gears.

You also have the link to the CAD Studio TIP 4724 : Involute curves for gears just above.

Edited by philippe JOSEPH - 03.Mar.2020 at 07:59
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 06.Mar.2020 at 08:50
There is so much to see on the internet....
carlosban71
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Post Options    Thanks(0)    Quote  Reply Posted: 08.Mar.2020 at 01:37
I need the gleason shaft pinion formulas
philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: 08.Mar.2020 at 07:54
Hello carlosban71, if you really need the geometry and resistance formulas it's all on the internet, provide you succed in 'reading' the documents; maybe this is only for the companies that fabricate them but try and search for example:
By subjects :
gleason shaft formulas    or    spiral bevel calculations
By documents ( PDF ) :
9.8_Calculation-for-Gleason-system-Straight-bevel-gear_TechnicalData_KGSTOCKGEARS
Calculation of Gear Dimensions _ KHK Gears
19830011869
19910021223
And so more ...

philippe JOSEPH
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Post Options    Thanks(0)    Quote  Reply Posted: Yesterday at 15:04

# CHECK OUT THE COMMENTS BEFORE LOOKING AT THE VIDEOS

BUT THE 3D METHOD LOOKS OK !!!!!

# How to make a Spiral bevel gear in Autocad | Autocad 2017 | 3dlearners

MAYBE IT'S BETTER TO SEE :

# Making 3D Bevel Helical Gear by Sweep ( Scale - Twist ) Command - AutoCAD 2017

Edited by philippe JOSEPH - Yesterday at 20:56