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Usually the choice is to have the pinion thrust away and have a thrust bearing right behind the pinion head. The gears don't care about direction, but the bearing syatem must handle the thrust along with the radial load.

How high is the speed and what reduction? Do you mean a differential or compound planetary? If the speeds are high, keeping the components in balance is an important factor. In high-speed designs, bearings are used to locate all the parts, thus load division is more difficult and high precision...

The standard way to do this is via a major diameter fit. Broach makers provide this to a SAE standard, and you gring the spline OD to obtain the fit. The specs are found in ANSI B92.1-1996. Since your male spline is short, and the hub is long, you could cur the spline in a stepped shaft with a...

Try these sources; https://www.rma.org/publications/gpg_publications/index.cfm?CategoryID=558 http://www.mpta.org/MPTAPubs.htm I don't know the specifics regarding test data behind the standards, I'm sure contacting them would get you that info.

Count the teeth in the ring gear and the sun. Add them and divide by the number of planets. If the result is an even number, then the timing is not special and no precautions are required. Make sure pinsize of replacment is as close as possible to original. Also, the remaining planets have...

Is the appearence that of a line with a red or brown color? This is fretting and is caused by repeated contacts without rotation. The protrctive oil film is squezed out of the contact zone and fretting starts at the microscopic level. The particles aid in further wear, and their build-up around...

The guy who wrote the book on failure analysis is Robert Errichello, contact him at GEARTECH, (406) 266-4624

In general, planetary drives backdrive as well as any other geared drive. They are commonally used both for reduction and increasing speeds. Ed

Gears are very efficent, with a lubricated gear tooth loss less than 1%. For a practical car drive, you probably need a steel gear with oil lubrication. Due to the high strength of hardened steel, the gear can be quite small and this keeps the size and cost down when comparied to plastic. The...

If the teeth arn't moving, but the counterbore is, it is actually a distortion. The stress relive ideas are good, this should be done just prior to finishing the dimensions you wish to hold. But; Nitrided parts can distort due to the internal stress created in the nitrided layer. If the part is...

I beleve there are standard cutters for common bullet rounding. If you could get your hands on a Cross manual, they may be defined there. The typical tooth rounder has a cam that really controls the rounding radius from one side of the tooth to the other, and the cutter from root to tip. The...

If this is refering to a gear driven printing press, the banding is due to transmission error(TE). The TE causes miss-register, seen as bands. This could be due to profile error, either from wear or poor gear quality. Backlash could also be a problem, but if banding is constant, and you can't...

Clean the teeth and paint with layout dye from Dykem. You will have to experiment with how long to run for a good pattern check, depends on oil film thickness. If the paint film rubs off too quickly, you will be looking at a composite of deflections as you are comming up to the load being...

This is a small gear, so induction should be sucessful. Consider the frequency, there should be some unhardened core to keep gear ductile. Induction hardening is difficult to control and should be avoided except for cases where you have lots of time to develop the process and process controls...

RUFUS2K; send me a fax showing the configuration, I'll let you kknow if we can help. 262-369-0367. If you have an electronic layout, our email is ehahlbeck@wi.rr.com

I'm not an expert on this, but intutitivly I think that the problem changes drastically if the joint sees a load direction change. If for example, a lateral force causes one side to change load direction, now pin clearence allows a slope between the pin and ears causing high local shear and...

Try demo from Hexagon software. www.hexagon.de

Frostie is correct, although concentric stages can also allow a conduit through the sun pinion. In any case, the complexity of planetaries pays for itself as torque increases. They provide less cost advantage in HS stages and are difficult to produce with high helix angles. Noise is a huge...

Planetaries shine when trying to increase power density. My guess is that isn't your design objective. Consider helical gears with very few pinion teeth. For example, say the pinion had only 3 or 4 teeth, then the gear has 48 teeth. At 20 DP, the gear is only 2.5 inches. The pinion needs to...

Worm drives can backdrive, depending on the lead angle of the worm. As this angle goes up, the backdriving efficency does as well. High lead angles are acheived with coarse pitch worms with small root diameters and multible threads. Thread finish, lubrication and materials have significant...