Extremely useful video thanks so much. I am Developing the Sumitomo Paramax 9000 Gearbox configuration software and ran into the issue of using the JIS vs CMAA classification system and I needed to know what the Load Cycle amount meant. Thanks for answering my question in this video and I look forward to watching the rest of your Cranes 101 series!
Thanks, Prescott! Hopefully you enjoy the rest of the series! We actually upgraded Cranes 101 into a Free Online Course if you're interested. resources.mazzellacompanies.com/liftingu-cranes-101-buying-an-overhead-crane
I have a 2 questions Q#1: Would like to explain my question by an instance that is if duty of a class A is defined by its number of cycles / lifts which are not gonna be more than 2 in an hour then how come it possible for a crane's motor to start stop 75 times? Q#2: What do you mean by bearing hours? I mean which bearing are you talking about? The hoist motor bearings?
Hey Muneeb, worked with the team and I'll add their answers below. If you want to learn more, you can find great information in CMAA 70, section 5. Answer to Question 1: There are package motors so typically the components supplied on a class A crane will be the same as the ones supplied on a class C crane. But it is still important to know the duty cycle of the crane because a crane on standby will still last longer than a crane being used in a standard manufacturing setting. Answer to Question 2: Crane duty cycle dictates the bearing life. When we talk about the bearing life, we are addressing all of the bearings - hoist / trolley / bridge motors, trolley / bridge wheels and lower block sheaves. The most important bearings on the crane are the ones used the most - the end truck wheels and motors.
@@LiftingandRigging thanks a lot for responding once again. But still there's confusion if the duty cycle is elaborated by number of start stop of hoist motor in an hour, then how can it be operated only twice in an hour? I mean if a class A crane is limited to a maximum of two lifts per hour then how it's motor can be operated more than the quantity of start stops? Once the motor is started it can perform two lifts.
Extremely useful video thanks so much. I am Developing the Sumitomo Paramax 9000 Gearbox configuration software and ran into the issue of using the JIS vs CMAA classification system and I needed to know what the Load Cycle amount meant. Thanks for answering my question in this video and I look forward to watching the rest of your Cranes 101 series!
Thanks, Prescott! Hopefully you enjoy the rest of the series!
We actually upgraded Cranes 101 into a Free Online Course if you're interested.
resources.mazzellacompanies.com/liftingu-cranes-101-buying-an-overhead-crane
I have a 2 questions
Q#1: Would like to explain my question by an instance that is if duty of a class A is defined by its number of cycles / lifts which are not gonna be more than 2 in an hour then how come it possible for a crane's motor to start stop 75 times?
Q#2: What do you mean by bearing hours? I mean which bearing are you talking about? The hoist motor bearings?
Hey Muneeb, worked with the team and I'll add their answers below. If you want to learn more, you can find great information in CMAA 70, section 5.
Answer to Question 1: There are package motors so typically the components supplied on a class A crane will be the same as the ones supplied on a class C crane. But it is still important to know the duty cycle of the crane because a crane on standby will still last longer than a crane being used in a standard manufacturing setting.
Answer to Question 2: Crane duty cycle dictates the bearing life. When we talk about the bearing life, we are addressing all of the bearings - hoist / trolley / bridge motors, trolley / bridge wheels and lower block sheaves. The most important bearings on the crane are the ones used the most - the end truck wheels and motors.
@@LiftingandRigging thanks a lot for responding once again.
But still there's confusion if the duty cycle is elaborated by number of start stop of hoist motor in an hour, then how can it be operated only twice in an hour?
I mean if a class A crane is limited to a maximum of two lifts per hour then how it's motor can be operated more than the quantity of start stops?
Once the motor is started it can perform two lifts.