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Lathe, Max. load in chuck, betwen centers and spidle speed

Lathe, Max. load in chuck, betwen centers and spidle speed

Lathe, Max. load in chuck, betwen centers and spidle speed

(OP)
I am an electrical engineer that I have received the order of calculating the capacity of load of a lathe. I have realized the calculation considering the life of the bearings, but I obtain values very high of capacity. I would want to know that criteria can apply  to obtain a few safe results.

Thank you

RE: Lathe, Max. load in chuck, betwen centers and spidle speed

Almost all manufacturers have their "advertised" maximum workpiece weights and corresponding rpm's.  I would imagine that most machines could far exceed their advertised capacity if you were to calculate using bearing capacity alone, but remember, the instant a toolbit hits the workpiece, the calculation changes.  RPM is another story.  You can have a very heavy seemingly balanced workpiece turning just fine at, say , 350 rpm, but bump that up to 500 and the machine might start vibrating like crazy.  The weight and footprint of the machine have a lot to do with its practical capacity as well.  

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