ISO makes a distinction as to size, as well.  Small motors could be balanced to 6.3.  However, why?  It doesn't take much if any longer to get to 2.5 if using an appropriate size and quality balance machine.

I hesitate to give guidance, because some motors may have flexible modes of concern, probably not for this one - but I have no specifics.

I do not know if I have an up to date API for motors without going to our standards to get one, but an old API 541 said 4W/N.  This would be approximately a G 0,65.

Well that may explain some extra work we get for motors to petrochemical, that's good :-) It does depend on how many you balance/produce what the cost impact will be to make them better, as always it is a price competition or just as often a production optimization process that may give different results.

I see that article gives the example according to 4W/N for ISO 1940.  I would look at this as divide by 2. 

Awhile ago I put something together on some of this.  I updated a few years ago.  I trust that it may be of use.  The updated version seems to have problems when I read the pdf - I'll have to redo this later.


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