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Just a thought: a non-circular gear set, similar to the one below, possibly designed for a bigger surge. O2 would be the driving gear. https://prozamet.pl/galeria/si23.jpg Put a number of such Non-circular gear sets in a serial arrangement to get more surge:

It's multiplication.

For MOW, no test radius should be specified as wires will touch the flanks on a radius they choose to. That radius depends on many factors, including gear basic data, wire diameter and tooth thickness. You have influence on the test radius by choosing the wire diameter.

That's right. There are some further details like contact ratios and shapes of fillet sections, but the general idea is this.

A single involute gear can not be designed with any operating pressure angle, because the latter is always created in the meshing of two gears. One gear can be meshed with multiple gears with a different operating pressure angle in each meshing. Both gears in such a pair must have equal normal...

*secret data received via email* It looks like a serration, not an involute spline. I calculated dimensions between balls (not over balls, it is an internal) and the results match the data on the drawing. So, no easy answer, you probably need to dig until you find the cause of these two...

The tolerances you posted look strange. If you posted all the specs, I could run them to see if they are ok.

I've been around, I only write when I feel I have something useful to share. And how about you, are the headaches gone?

The answer is yes. This can be caused by a number of factors, including profile angle errors, pitch errors and tooth line errors. The Mdk measurement tends to indicate a wider space than the gauge.

Hi AFAIK, DIN 3960 has some definitions for involute gearing, so it won't be possible to calculate the inspection information based only on that plus module and the number of teeth. Do the datasheets contain no inspection information?

4 years later, it seems like: gearguru & tbuelna go on that list too.

You have got all the formulas in that doc you posted on pages 13, 14, 17-19, 23-24. The data for measurement between pins are in Part 2 of the standard.

DIN 5480 N74x2x30x36xG7 Internal involute spline. Off-standard, needs to be calculated. Module: 2 mm Profile angle: 30 degrees Number of teeth: 36 Profile shift: 0.1 mm Circular space width w/tolerance: 3.026 +0.027/+0.052 mm Minor dia.: 70+0.19 mm Major dia.: 74+0.54 mm Form dia. min: 73.68...

OT: 710 kW at 1500 RPM gives me 4.520 Nm. So, the "MECH RATING" of 1270.9 obviously isn't the maximum torque. Would it be the maximum power in kW?

There is a direct relationship between tooth thickness / space width and OBD. Balls (pins, wires) used for measuring the OBD touch flanks, the distance between flanks is tooth thickness. Here are the formulas: https://khkgears.net/new/gear_knowledge/gear_technical_reference/tooth-thickness.html...

https://gearsolutions.com/departments/tooth-tips/determining-tooth-thickness-of-various-gear-types-part-iii/ Can you provide between pins dimensions taken with 3 different pin diameters?

https://www.beuth.de/en/standard/din-5480-15/81839131 38 pages https://www.beuth.de/en/standard/din-5480-15-berichtigung-1/113404813 (Corrigendum to DIN 5480-15:2006-03 ) 2 pages

Furthermore, the edition DIN 5480-15:2006-03 lists changes made to the DIN 5480-15: 1974-09, and the differences are editorial except for removing two gauge tolerance classes LQ3 and LQ4. So, the 2006 edition has the backward compatibility and replaces the earlier editions, as the probability of...

It's been replaced with DIN 5480-15:2006-03

The DIN 5480-14 is now a part of DIN 5480-1:2006-03.