It would be a guess-estimate at best! Having a ratio of 6.12:1 likely means it is a double reduction, seriously increasing the complexity. In addition, by definition AGMA nameplate gear ratios may not be exact.
Some possible methods that might help. As a rough guide use about 18 to 20 teeth on the input pinion and estimate the gear mesh. So on a 1780 motor, mesh would be about (18 * 1780) / 60 = 534 Hz. Do you have a peak in the spectrum around that frequency?
How about the ability to examine a spare machine in a warehouse, or a damaged machine where the internals may be accessible?
Thank you for the reply! This is a single reduction Marley cooling tower gear box. I have a peak of 10,200cpm and a running speed of 1,457. So I was think it has 7 teeth on the pinion gear. I am also seeing 2 and 3 times the 10,200 peaks. Mathematically this works but I am hoping to get the actual gearbox data so I wouldn't have to guess on the report.
Seven teeth on the pinion would be very low, but not impossible. If indeed that is the case I would suspect it is a spiral bevel. Can you provide the best obtained out put speed when the input is 1457 RPM. I have various ways to calculate the tooth combination; one involves using ratio and the other using speeds. The two methods differ significantly in the method so I typically do both as a cross check.
This is a spiral bevel. Output speed appears to be about 210 rpm.
Something wrong…1457/210 = 6.938 but up front you said the ratio is 6.12:1. Verify the speeds, confirm this is a single reduction and see if you can get any info that would confirm seven teeth on the pinion.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .