Gear Train Generator

[Julia Kozub]

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

I'm trying to build a self-regenerating door lock as a side project in college and i'm having some difficulty accurately calculating the gear trains output (in rpm), the purpose of this gearing system is to operate a AC generator. Any help at all would be much appreciated!

I've estimated that a torque of about 1.12 Nm will be used to turn the door handle down 50 degrees. This torque will be transmitted through the shaft which is attached internally to a one way gear. The one way gear is attached to both a fly wheel and the gear train.

My goal is to get an output of about 100 rpm to operate the generator. My question is what factors must i include in the calculation? do i need to include things such as the weight of the gear train and how do i factor in the fly wheel? Thanks!

SO coupling the shaft to the alternator with a one way clutch and a say 4:1 speed up gearbox gives you about what you want. One stage of the epicyclic gearbox in many battery electric drills may be about right. These may have multiple stages to get higher ratios.

Flywheel does not alter energy delivered but can modify user handle-feel and rate of delivery - eg if a flywheel is spun up by a 1 way clutch it may spin down over 1+ seconds and deliver energy at a less peaky rate.

Bonus: Obtaining energy from the opening or closing door is liable to be rather more productive if suitable to purpose. The door can eg have a spring closer and drive the alternator on one or both halves of open/close cycle. Energy taken from this source is liable to less noticed and easier to obtain in greater quantity.

Cheap plastic hand crank alternator.Mechanical efficiency is usually poor.Note gear ratio is probably higher than apparent as another gear is probably not shown. ie their alternator spins MUCH faster than yours. The plastic Z-ish shaped piece in the flywheel acts as a one way clutch/pawl.

From Wikipedia

Failure in one of any one of these will result, in the best case, to a nice safe auto rotation. In the most catastrophic case, it will result in a complete loss of control of the helicopter an end in a crash.

This gear case serves as the structural support for the engine which means that all engine components consisting of the compressor, the turbine and engine accessories are attached to the case. Three points on the gearbox are used as attachment points to the airframe. A two-stage helical and spur gear set is used to reduce rotational speed from 33,290 rpm at the power turbine (N2) drive, to 6,016 rpm at the output drive spline.

The accessories mounted externally to the gearbox and driven by the N2 gear train are the airframe furnished tachometer-generator and the power turbine speed governor. The accessories mounted externally to the gearbox and driven by the gas producer turbine (N1) at an rpm of 52,000 are the fuel pump, an airframe furnished gas producer tachometer-generator, gas producer fuel control and airframe furnished starter/generator. Internally mounted is the engine oil pump. Finally, mounted on either side of the gearbox are the compressor and turbine assemblies.

The fuel pump now delivers fuel to the fuel control. The fuel control manages this fuel and sends it to the combustion section fuel nozzle for ignition. The N1 tach generator rotates and sends an electronic signal reporting N1 rpm to the pilot. The oil pump begins distributing oil throughout the engine where lubrication is required. All this happens simultaneously. At a certain N1 rpm, the pilot will introduce fuel into the combustion section and ignition takes place. Now the N1 turbine is powering the compressor and the N1 accessories, and is no longer being driven by the starter. We should also note that the N2 gear train and turbine are not mechanically tied to the N1 gear assembly. How does the N2 gear train join the party? It works independently of but concurrently with N1.

Take a look at the depiction of the N2 gear train and turbine assembly. While the N1 is churning away the N2 section is also slowly joining the party. By design, the N2 turbine wheels are turned by the energy of the expanding hot air delivered to it by the N1 gear train. The purpose of this helical gear train is to convert the kinetic energy produced by the motion of the N2 rotor to usable shaft horse power to sustain helicopter flight. This is why when you watch a RR 250 start, you hear the engine running at a higher rpm which is the N1 assembly, but see the main rotor blade rotation moving slowly at the beginning of the start sequence. Again, referring to our depiction, you can see coupled to the N2 rotor is the helical power train drive gear (pinion gear). This gear is matched to and drives the helical torque-meter gear (whose additional function we will review soon). Geared to and driven by the torque-meter gear is the helical power take off (PTO) gear. The PTO gear, as you will notice, has a straight-cut gear as part of its assembly. This drives the gear shaft, which turns the N2 governor and the N2 tach-generator.

We have looked at the gearbox and its contents as a whole. I hope you will have gained more insight into and respect for the importance of the accessory gearbox and its support role regarding overall engine performance. In future articles we will go over the function of the oil system, torque system, and even the fuel system for this series of engines. Time permitting, we will do some troubleshooting along the way.

Mike Broderick has been an A&P technician since 1971. He has worked as a shop and hangar technician, field technician, customer support representative, and owner of a Part 145 engine overhaul facility. His specific experience is in turbo-shaft engines in light to medium helicopters. The one he is most familiar with is the Rolls-Royce (formally Allison) 250 series engines. He is currently employed at H.E.R.O.S Inc. & HYE-Tech Manufacturing LLC. His role within these two companies is VP of business development. H.E.R.O.S Inc. is a Part 145 repair station as a full service Rolls-Royce 250 engine and Honeywell fuel system overhaul agency. HYE-Tech Manufacturing LLC holds more than 300 PMAs for the Rolls-Royce 250 engine and the Honeywell fuel management systems for the 250 engine.

Yes, you can use a variety of materials such as magnets, copper wire, and a plastic or wooden base for the generator. However, it is important to ensure that the materials are conductive and can create a magnetic field.

The amount of power produced by a DIY hand held generator depends on the size and quality of the materials used. Generally, these generators can produce enough power to charge small electronic devices or power LED lights.

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