Hello!
The gear manufacturers do not provide no of teeth details in the drawings. For calculating GMF it becomes necessity. Please share here such data collected for various single/double/triple/quadruple reduction gear drives for makes such as Flender/Lufkin/Elecon etc?

I have done the following:

Call the OEM and give them the SN and they will have the data for you.

Wait until you open it up and count the teeth.

If possible to get an accurate speed of the input and output shaft take gearmesh/shaft speed and back calculate. Hard for multi shafts.

Seemant, tooth combinations can be virtually unlimited, even with the same input and output speeds, especially when you start talking double, triple, quadruple reductions. Flender could for instance provide one set of tooth numbers, but Lufkin something totally different for the same overall ratio.

As Ron points out, you have to determine what each gearbox has by calling the OEM or looking inside. There isn't any other reliable way.

John from PA

What I essentially meant was-if anybody has recorded any data for particular model, he/she can share the same.

Well manufacturer's are slow to respond and most don't even respond to mails. For new gearboxes , we ask them as a part of terms & condition before buying.

Seemant, for your information a gear box nameplate ratio can vary by as much as ±5% (depending on drive type). Typically "catalog" type drives can vary from the value on the nameplate by this amount whereas an API 613 gear box will have a very near exact ratio on the nameplate

Some background information...in 1959, AGMA published information sheet #271.02, "Ratios for Helical and Herringbone Gear Speed Reducers" which listed "standard" ratios based on a (1.5)^0.5 progression. It included a table of "Gear Ratio Tolerances": ± 3, 4, 4 and 4% for single reduction, double, triple and quadruple reduction, respectively. AGMA 420.04 (enclosed drive standard) in 1975 repeated the ratios, but modified the tolerances to 3, 4, 4, and 5%. Current enclosed drive standards (e.g., 6010 or 6009) have a clause on preferred ratios, but any mention of tolerances has been deleted. The standards only say that ratio is to be indicated on the nameplate, but does not stipulate nominal or exact. Checking Falk, Flender and Hansen websites it is interesting to see what they do in their catalogs. Falk's standard products state the 3-4-4-5% tolerances apply. The other manufacturers indicate they give exact ratios, but only to three or four significant figures.

I think you can readily see you have to get a tooth count from the OEM or start counting the teeth on the actual box.

John from PA

You can derive most of the tooth counts from vibration data using the knowns, dominant frequencies and sideband spacing. I wouldn't rely on that information to make any critical calls, but it is there.

Many manufacturers publish all the bearing and gear data and much of it is available on-line. I think Falk has their's on-line now.

Of the companies you mention, I have dealt with Flender and Lufkin. Flender gave me the answers I needed with a little prodding and Lufkin has been very responsive on many occasions.

I have lots of data, but like John said, the chances of me having the data you need are so low as to make it a waste of time. If you have specific information you need, perhaps you should invest your time into listing what you need rather than the rest of the world guessing at it.

Well Thank you all for your valuable inputs. I am searching for data regarding Flender ZTNW 1430 & 1630 gearbox. Its soft series from FLENDER.

Thanks