1x, 2x,..., 30x Rpm

[JeanMicheling]

Hello,

I just caught a signal with 1x to 30x rpm harmonics on a spindle. This is the first time I see that. I suspect that the spindle housing is loosened in its fit (this is a cartridge spindle). Have someone already seen this before?

Thanks for your help,

 

[JeanMicheling]

Answer to myself or anyone else...

It appeared that the spindle was vibrating in its cartridge. The play was probably over 0.010'' creating 1x...to 30x rpm harmonics.