Gear 3D print file generator

[Tom Kitta]

STLGears.com

The Free STL Gear Designer For 3D Printing

www.stlgears.com

This generator is gold - I am printing all the change gears here. Sure its plastic but hey its for like threading so should be good enough.

Also all sorts of gears are supported as well as internal gears!

You can prototype whole gear box in this generator!

 

[Janger]

That is a good one Tom!

 

[Arbutus]

Thats a useful application. I tested it with these 60T - 20T M1 bevel gears printed in PETG-HF.
After importing into F360, these mesh models (.stl) can be converted into solids for additional changes, such as the boss and keyways on these gears.

The app produces fully formed and consistent meshes without holes, gaps or cusps so no repairs are needed unlike some other .stl gear generators.

Tho only issue I found was that the generated object is ten times larger than it is expected to be. So my 60T gear was generated as 600mm diameter.

 

[Tom Kitta]

Thats a useful application. I tested it with these 60T - 20T M1 bevel gears printed in PETG-HF.
After importing into F360, these mesh models (.stl) can be converted into solids for additional changes, such as the boss and keyways on these gears.

The app produces fully formed and consistent meshes without holes, gaps or cusps so no repairs are needed unlike some other .stl gear generators.

Tho only issue I found was that the generated object is ten times larger than it is expected to be. So my 60T gear was generated as 600mm diameter.

View attachment 67492View attachment 67491

I used it to print about a dozen gears so far - but all of mine are M1 spur gears - no size issues.

 

[eotrfish]

I just tried to model a 47T M1.25 gear. Imported the .STL file into Inventor.


The OD of this gear should be 2.313", so 26.95 times as large as it should be???


Anybody got any tips to make this .STL gear generator work properly??

 

[Arbutus]

So to calculate the OD of a module spur gear:

D = M * (N + 2) = 1.25 * (47 + 2) = 61.25mm, not 62.342" or 58.75mm

Sounds like someone forgot the '+2' part.

 

[eotrfish]

Yep - I know how to calculate the OD of a module spur gear.

The model with 62.232” OD is directly from the STL gear generator. The model is no where near the correct dimensions. Seems like more than “forgot the +2)

The model with 58.75mm is from my gear supplier.

 

[Arbutus]

Yep - I know how to calculate the OD of a module spur gear.

The model with 62.232” OD is directly from the STL gear generator. The model is no where near the correct dimensions. Seems like more than “forgot the +2)

The model with 58.75mm is from my gear supplier.

My point was that the gear generator is hooped (the calculation is fundamentally wrong) not that you didn't know how.

But more interesting is how you are able to buy a 47T m1.25 gear from anywhere with an OD of 58.75 !

 

[Arbutus]

My point was that the gear generator is hooped (the calculation is fundamentally wrong) not that you didn't know how.

But more interesting is how you are able to buy a 47T m1.25 gear from anywhere with an OD of 58.75 !

It turns out that 58.75 is the PITCH diameter of the 47T gear, not the OD. Useful when calculating centre to centre distances.

 

[eotrfish]

SDP-Si

I’ll let you know when the gear shows up. Pretty sure it won’t be 62+”OD

 

[Tom Kitta]

Inputs
Number of Teeth: 47
Module: 1.25
Pressure Angle: 20 degrees
Gear Type: External

Outputs
OD Reference: 61.2500 mm 2.4114 in
Pitch Diameter: 58.7500 mm 2.3130 in
Root Diameter: 55.6250 mm 2.1900 in

quick way to actually check the size is to print it. The app does not show - at least cura - the exact object max dimensions but dimensions at the chosen by program vectors which may or may not correspond to the actual extreme points.

My printed gears mashed with actual metal gears perfectly.