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Motor for 250 ton mechanical press Smile
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Posted by: Kulu

03/27/2007, 05:23:05

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Hello

Can any one tell me what is the relation between power of the
motor and tonnage of the mechanical press.
How the capacity or the power of the motor is calculated

For example what HP / Kw motor is required for 250 ton mechanical press

RGDS








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Re: Motor for 250 ton mechanical press
Re: Motor for 250 ton mechanical press -- Kulu Post Reply Top of thread Forum
Posted by: randykimball
Barney
03/28/2007, 00:03:45

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You have ask a question that requires many other questions to be answered.

What kind of mechanical? crank case, leverage, brake press, punch press ...??
What gear ratio is to be used between the motor and the crank?
What sized flywheel?
How heavy is the ram?
How long are the journal rods?
What length of stroke is it?

Some large mechanical presses have quite small motors, it is all done with gear reduction, crank size, and flywheel mass.
This is one of the greatest advantages of a mechanical brake press. One very serious disadvantage is the difficulty of stopping the ram in mid stroke in the event that a body part gets into the pinch point.





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Modified by randykimball at Wed, Mar 28, 2007, 00:05:49


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Re: Re: Motor for 250 ton mechanical press
Re: Re: Motor for 250 ton mechanical press -- randykimball Post Reply Top of thread Forum
Posted by: jboggs

04/02/2007, 19:23:17

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I always assumed that the tonnage rating had to do with the strength of the mechanical structure (crankshaft, bearings, journals, sidewalls, etc.) rather than anything to do with the rotary input power. If that were the case, then you could raise the "rating" of a press just by putting a bigger motor on it, and I don't think you can do that. In other words, while the motor size is related to the tonnage of the press, I don't think it DETERMINES the tonnage of the press.







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