Can someone give me there opinion on this spectrum. It is a radial measurement taken on a gear box. The Gears are driven by a belt with the input gear shaft turning at 361rpm, I calculated the belt frequency at 120rpm. The spectrum has multiple frequencies spaced at 131.25cpm- so close enough I guess, its just the number of harmonics (if this is the bf) that is confusing me. Would this be normal or am I missing the point and the gears are the problem?


J

How many reductions are there in the box. Do you know the ratio?
What is the resolution of the spectrum? Is 11.25 within your resolution?

D

If it is indeed belt frequency, the amplitudes are low.

D
The resolution is 3200. The gear box ratio is 1:135.96 with I believe 2 gear wheels.

jamie

This was indeed the belt which had shed a number of teeth. Even with the low amplitude the belt was banjoed.Using a tacho the belt frequency was 130 and a higher resolution matched this up exactly.


Jamie