Is a 2.126 Diameter A2 Tool Steel Shaft Sufficient for 2,500 ft/lbs of Torque?

  • Thread starter Thread starter Indiana Dave
  • Start date Start date
  • Tags Tags
    Calculation Torque
AI Thread Summary
A 2.126-inch diameter A2 tool steel shaft, hardened to Rc 48-52, is being evaluated for its ability to handle a peak torque of 2,500 ft/lbs. The discussion highlights the need for accurate calculations, particularly concerning allowable shear stress, which typically ranges from 12 ksi to 20 ksi for tool steel. Concerns are raised about the adequacy of static loading calculations, suggesting that a comprehensive shaft design process should include considerations for fatigue loading due to cyclic stress. Recommendations include consulting Shigley's Mechanical Engineering Design for guidance and reviewing relevant educational resources. The overall consensus is that thorough analysis is essential for ensuring the shaft's performance under the specified torque conditions.
Indiana Dave
Messages
1
Reaction score
0
Good folks, I need some guidance.

I have a shaft in a machine, hardened A2 tool steel- Rc 48-52 that is 2.126" dia., 3" long.

This shaft will see a maximum peak torque loading of 2,500 ft/lbs.

I am hopelessly mired in calculations I do not trust. Can someone weigh in? Is this shaft section satisfactory?

Thanks!
 
Engineering news on Phys.org
Try this approach:

Torque = J * allowable stress / radius

J = polar moment of inertia = 1/2 * PI * radius^4

allowable shear stress for tool steel - you will need to look up, but probably somewhere between 12 ksi to 20 ksi. If your tool steel is HRC, the yield may be much higher. See if you have MTR for the steel.
 
Last edited:
Hi I'm new here. i just came across this post.

edgepflow,no offence but won't that method account for only static loading?
You might have to go through the whole shaft design process (Free Body Force diagrams-->BM and shear force diagrams-->stress calculation using endurance limit etc.) for fatigue loading(cyclic stress) since it will be mounted in a machine. I'd refer to Shigley's Mechanical Engineering Design book ISBN: 0−390−76487−6. To be honest i experienced MANY problems myself, when i designed my first shaft alone, so i know how it feels.
 

Thread 'A practical way to vaporize fuel for high MPG?'

Here's a video by “driving 4 answers” who seems to me to be well versed on the details of Internal Combustion engines. The video does cover something that's a bit shrouded in 'conspiracy theory', and he touches on that, but of course for phys.org, I'm only interested in the actual science involved. He analyzes the claim of achieving 100 mpg with a 427 cubic inch V8 1970 Ford Galaxy in 1977. Only the fuel supply system was modified. I was surprised that he feels the claim could have been...
View full post »

Thread 'Technical Analysis on Titan Sub (Titanic Sub)'

TL;DR Summary: Heard in the news about using sonar to locate the sub Hello : After the sinking of the ship near the Greek shores , carrying of alot of people , there was another accident that include 5 tourists and a submarine visiting the titanic , which went missing Some technical notes captured my attention, that there us few sonar devices are hearing sounds repeated every 30 seconds , but they are not able to locate the source Is it possible that the sound waves are reflecting from...
View full post »

Similar threads

Calculating the Diameter of a Breakaway Bolt for 40 ft-lbs Torque Requirement
Replies
3
Views
4K
How is this related to Calculating Shaft Torque?
Replies
8
Views
30K

Hot Threads

Recent Insights

Back
Top