Torque on shaft due to impact loading during rotation

In summary, the conversation discusses various methods for determining the torque load on a shaft when the cutter flutes make contact with the material they are cutting. These methods include calculating the force on the flute, using a lever arm and spring balance, and monitoring motor power while cutting. Additionally, the conversation suggests using a helical cutter head as a solution for more efficient and cost-effective production.
  • #1
Spoolx
38
0
Hi All,
I am trying to determine the correct equations to apply with a problem I have run into at work.

Basically I have a shaft with a cutter with straight flutes, I am trying to find out the torque load on the shaft when the cutter flutes make contact with the material they are cutting.

Any help would be appreciated.

Thanks
 
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  • #2
Also, Maybe it would be easier to just calculate the force on the flute and turn it into a torque that way?

I am not having a lot of luck calculating the force though.

Thanks
 
  • #3
Maybe put a lever arm and spring balance on the cutter shaft and start a cut by hand in the material. That will give you the torque needed to commence a cut. It does not include the inertia of the cutter head that is driven by the shaft.

Alternatively, if you can monitor the average motor power while idle and while cutting, subtraction will identify the total energy flow to the cutters. You can measure the angle over which the cutter is in contact with the material, and given the number of cutters and RPM, you can work out the force needed to push a cutter through the material. From that you can get the change in shaft torque.

You could just avoid the calculation by changing to a helical cutter head which will have a constant torque, better finish and chip removal. As an example, a Shelix Spiral Cutter with carbide indexable inserts. http://www.byrdtool.com
Yes, they are expensive, but in production they pay for themselves quickly. http://www.byrdtool.com/planers.html
 
Last edited by a moderator:

1. What is torque on a shaft?

Torque on a shaft is the measure of the twisting force applied to the shaft. It is a vector quantity with magnitude and direction, and it is typically measured in Newton-meters (Nm) or pound-feet (lb-ft).

2. How does impact loading affect torque on a rotating shaft?

Impact loading occurs when a sudden force is applied to a rotating shaft, causing it to experience a momentary increase in torque. This can be damaging to the shaft and other components of the system, as it can exceed the design limits and cause failure.

3. What factors influence the torque on a shaft during impact loading?

The magnitude and duration of the impact force, as well as the rotational speed and mass of the shaft, all play a role in determining the torque on a shaft during impact loading. The stiffness and material properties of the shaft also affect the amount of torque it can handle.

4. How can torque on a shaft due to impact loading be calculated?

There are various methods for calculating torque on a shaft during impact loading, depending on the specific scenario. Some common approaches include using the conservation of angular momentum equation or conducting experimental tests to measure the torque directly.

5. How can the negative effects of torque on a shaft during impact loading be minimized?

To reduce the risk of damage from torque on a shaft due to impact loading, engineers can consider factors such as selecting a stronger or more flexible material for the shaft, optimizing the design to distribute the force more evenly, and implementing protective measures such as shock absorbers or dampers. Regular inspections and maintenance can also help identify and address any potential issues before they become more serious.

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