Generator Gear

[Tisham Candella]

Thiscalculator generates the .DXF and .SVG files for making external spur gears, rack and pinion sets, and internal spur gears. DXF files are accepted by most machines that cut 2D shapes such as CNC wood routers, laser cutters, waterjets, and CNC plasma tables. A DXF is also the starting point for various CNC machines that require CAM software. Standard spur gear calculations, graphics, and .DXF files have never been more accurate, accessible, or easy. Involute tooth form only. Clocks use the cycloidal or triangular tooth forms.

To calculate a spur gear, simply decide and input your tooth count, gear module, and pressure angle and the online spur gear DXF generator will do the rest. A spur gear calculator uses these parameters to generate the involute tooth form that's the right size and shape to take into your CAD software, or straight to a CNC router or laser cutter.

The live output lets you visualize your spur gear to ensure you have the right fit and to manage the undercut and gear size, while the .DXF and .SVG outputs will fit into your CAD software or graphics software. If you're looking to make the right gear blank for your gear, you can use our free Gear Dimension Calculator to find the key dimensions of your external spur gear.

Spur gears can be used in a wide variety of applications. Having a DXF or SVG file for your gear is the first step to building your new gear project. After you have your 2D model of your spur gear, you can use this file for a range of applications.

One of the more common mistakes we see in simplified gear software is the lack of undercut in small tooth count gears. This can make gears bind or function poorly. We also see low resolution involute shapes that could function better if they had the correct geometry with sufficient data points defining the involute.

Being members of the American Gear Manufacturers Association (AGMA) and having manufactured gears in most plastics and metals, the details count. So we put the same attention to detail and mathematical skill to work for everyone. For measuring and inspecting gears, using a Measurement Over Pins Calculator is one of the best methods to ensure your gears are perfectly in-spec.

Pro-Tip! Notes for the wood shop or anyone using an endmill to make the cut:

The bit size is a very important consideration! Depending on your software, if the cutter is too large it will either over-cut the root and weaken the tooth, or leave a radius and not finish the involute profile or undercut. When using your CAD program, compare the cutter diameter to the gear's root space to make sure it's small enough and has some clearance

Spur gears transmit power through parallel shafts. The ratio of tooth count between two gears changes the relative speed of those gears by that ratio. Spur gears can increase or decrease the speed of a mechanical system, increase or decrease its available torque, or change direction from forward to reverse.

The module of a gear controls its size. Module is the ratio of the reference diameter divided by the number of teeth; so that a gear with a larger module will have a larger diameter. Small module gears (0.1-0.5) are found in watches and clocks, while larger module (1+) may be found in machine transmissions. More here

Gear Generator is unitless: if you wish it's inches, cm or millimeters. DXF opened in AutoCAD will have the same value for D/P as it is set above. Gears in SVG are measured in pixels, which is the value multiplied with the scale (Pixel per Unit) as it is displayed on the right side.

Gear Generator is a tool for creating involute spur gears and download them in DXF or SVG format. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the input/output ratio and rotation speed. Gears can be animated with various speed to demonstrate working mechanism.

Why this tool was created? Just for fun. I'm working on a hobby project, a scale construction machine, which needed some spur gears, and I quickly made a simple spur gear creator script in Javascript with SVG output. As it was done, I couldn't stop, and I added more and more features, and finally I got this tool. It was a pleasure to code the whole thing, I'm a bit sad it is already done.

Notes about browser compatibility: all new major browsers are supported (i didn't tested IE), but unfortunately Chrome can't render SVG circle correctly. The winners are: Opera for the best performance (shame on me, I never use it) and Firefox for the best looking SVG render.

Hello,

During recent work with inventor we encountered a serious problem with the spur gear generator. The generator appears to have broken down and does not calculate no matter the input.

As it is opened the error is present straight away. We tried changing the parameters and goals of calculator, but nothing changed. It appears that the program has saved some invalid data which blocks the calculation and terminates the whole generator work.

Hope you could give us some insights or a solution.

sorry that you see this problem. Could you try to remove default values for this generator. The values are stored in this file: "c:\Users\\AppData\Roaming\Autodesk\Inventor 2019\DesignAccelerator\Defaults\CAGearsSpur.Metric.xml"

The other generators seem to work just fine, all calculations are correct and show no errors. The spur gear generator shows errors and incorrect data (as in the previously posted pictures) as soon as the generator is opened. One peculiar thing I noticed about this error is that when I set the generator option to calculate inner toothed gears it changes the dimension between gear axes to a smaller value (let's say from 100 mm for outer to 60 mm inner as it's supposed to). But when the option is set back to outer (the checkbox is unchecked) it does not recalculate the axial length and gets stuck of the lower number.

Hello again,

At last, the solution helped! The removal of the original file once again seemed to have no effect on the performance of the generator. However, once the new settings were inserted, the software seemed to instantly work as it should. Thank you for not turning the problem down. Your help is greatly appreciated.

Sincerely,

Rytis

Hello again,

The problem appeared again. However his time replacing the CAGearsSpur file does not help. I also noticed that other generators seem to not works as well. So far I have tried deleting all the defaults files I could find, but with no luck. I desperately need for the accelerator to work this time.

Iv'e got a 3D printing project on the go and I need to design a gear assembly. I'm relatively new to inventor but have used autocad for over 30 years. I have generated 2 gears using the spur gear component generator (see first image). all seems good, but when i look closely the teeth from one gear appear to be fouling the teeth from the second one (see second image). I have attached the parameters from the generator dialogue box (see third image). I spent all evening yesterday trying all sorts of parameter combinations but while some work better than others I can't avoid some degree of tooth collision. For what I am doing and the tolerances on the 3D printer it probably wont matter too much, but for me that is not the point. The point is I'd like to know how to get it spot on. I even thought at one point it might be a screen display issue, but I exported it to autocad and was able to put a dimension to it. Any help to point me in the right direction would be greatly appreciated. Thank you.

The tooth profiles generated by the spur gear accelerator are only a visual representation and not a true involute curve tooth profile, unfortunately. However, you can extract the correct tooth profile as a sketch once you've created the spur gears by RMB clicking on the spur gear in the browser and choosing Export tooth profile. In the subsequent dialogue you can alter the tolerance values etc for the profile and choose whether it's the pinion or gear that you want; you'll have to do it two times to get both, I don't understand why you can't just export both at the same time. What you'll get is a new part file with a sketch that is the correct profile. You'll have to extrude cut it and do a circular pattern to recreate the gear.

Come on Autodesk, make this an option in the initial gear generator window to create precise or simplified gears, let us make the decision whether to take the performance hit or not; with the power of todays computers, I doubt there would be any noticeable tradeoff.

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