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Unread 03-25-2011, 01:38 PM
rahilm rahilm is offline
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pic: Twisted Hex Shaft

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Unread 03-25-2011, 01:50 PM
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Re: pic: Twisted Hex Shaft

Impressive. A harsh reminder of the kind of force that FRC bots exert.
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Unread 03-25-2011, 01:54 PM
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Jared Russell Jared Russell is offline
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Re: pic: Twisted Hex Shaft

3/8" diameter, 2024 aluminum?

I'm curious to know just how much torque that took...

In 2008, our arm was able to rotate the keyway of a piece of hardened 1/2" steel keyshaft almost 90 degrees. It's impressive how an FRC robot can destroy itself!
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Unread 03-25-2011, 02:14 PM
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Re: pic: Twisted Hex Shaft

waht kind of aluminum is the turnbuckle?
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Unread 03-25-2011, 04:25 PM
rahilm rahilm is offline
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by Jared341 View Post
3/8" diameter, 2024 aluminum?

I'm curious to know just how much torque that took...

In 2008, our arm was able to rotate the keyway of a piece of hardened 1/2" steel keyshaft almost 90 degrees. It's impressive how an FRC robot can destroy itself!
1/2" 7075, which is why we were pretty surprised.

Quote:
Originally Posted by Andrew Y. View Post
waht kind of aluminum is the turnbuckle?
Not sure the alloy, but it was some small diameter (bad idea in hindsight)
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Unread 03-25-2011, 04:31 PM
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Re: pic: Twisted Hex Shaft

gotcha 7075 was the number iw as looking for. Just to be nosey it wasnt 7075 -0 right?
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Unread 03-25-2011, 04:48 PM
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by Andrew Y. View Post
gotcha 7075 was the number iw as looking for. Just to be nosey it wasnt 7075 -0 right?
I've never seen Al hex in anything other than T6
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Unread 03-25-2011, 04:56 PM
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Re: pic: Twisted Hex Shaft

Wow, that is quite a failure for a 1/2" 7075 shaft. Can you explain in a bit more detail the application this was in under failure?

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Unread 03-25-2011, 04:58 PM
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by Cory View Post
I've never seen Al hex in anything other than T6
never seen dosent mean never exists.

most common types of 7075 is 0, T6, and T631. Although there are MANY different types such as T7362 is also a common one.
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Unread 03-25-2011, 05:07 PM
rahilm rahilm is offline
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by Andrew Y. View Post
gotcha 7075 was the number iw as looking for. Just to be nosey it wasnt 7075 -0 right?
T7351 Actually.

Quote:
Originally Posted by Brandon Holley View Post
Wow, that is quite a failure for a 1/2" 7075 shaft. Can you explain in a bit more detail the application this was in under failure?
It was on our arm. Basically we have 2 Banebot's gearboxes with chain running up to the arm. We have approx. 50 lb-ft of torque (don't worry, 1:4 chain reduction, only 6.25 lb-ft on each gearbox). We have chain on either side of the arm, and we decided to change the tensioning method to turnbuckles. Almost immediately as we raised the arm, the turnbuckle one side (the twisted side failed) while the other one held. The torque of the arm in addition to tension being held by the chain all released in one instant twisting the shaft, as the tension still held on the other side (on which the gearbox's rollpins sheared)
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Unread 03-25-2011, 05:24 PM
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by rahilm View Post
T7351 Actually.

thanks for the assist...my brains all scrambled this morning
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Unread 03-27-2011, 05:10 PM
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sometimestommy sometimestommy is offline
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Re: pic: Twisted Hex Shaft

Whew! thought that was a lead screw
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Unread 03-28-2011, 04:57 AM
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Re: pic: Twisted Hex Shaft

Quote:
Originally Posted by sometimestommy View Post
Whew! thought that was a lead screw

I also think so.
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