pic: Another stripped VexPro gear

[gblake]

Originally Posted by 31Josh61

We had the same problem at waterloo, We sheared 3 Gears in 7 Matches, its the gears because we used two different gear boxes and they sheared on both

Congrats on making it to Worlds

Or ... It might be the way that you are using the gears (or it might not).

More stress than the part was designed to withstand = It breaks.

How do you know that you aren't exceeding their advertised ability to withstand static or dynamic loads?

Instead of writing "it's the gears", you might need to write "it's our robot"?

Blake

[techhelpbb]

Originally Posted by gblake

Or ... It might be the way that you are using the gears (or it might not). More stress than the part was designed to withstand = It breaks.

How do you know that you aren't exceeding their advertised ability to withstand static or dynamic loads?

Blake

How would you test that without ruining gears?
I mean you'd have to test it to Vex's specification and then risk testing it in a drivetrain.

Testing to Vex's specification would rule out defective gears...testing your drive train would demonstrate a design issue.

[Michael Hill]

Originally Posted by techhelpbb

How would you test that without ruining gears?
I mean you'd have to test it to Vex's specification and then risk testing it in a drivetrain.

Testing to Vex's specification would rule out defective gears...testing your drive train would demonstrate a design issue.

You just have to calculate the theoretical max torque based on the Lewis gear equation, then include a factor of safety.

[gblake]

Originally Posted by techhelpbb

How would you test that without ruining gears?
I mean you'd have to test it to Vex's specification and then risk testing it in a drivetrain.

Testing to Vex's specification would rule out defective gears...testing your drive train would demonstrate a design issue.

All I'm saying is, even the strongest gear teeth will break off when subjected to too much stress.

If that happens, you don't write, "it's the gears." Instead you you would write, "it's our robot.", or "it's our driver.", or ...

[Thayer McCollum]

We had a VEX gearbox failure in the same type of gearbox. But it was the gears that failed, it was the casing. We took an especially rough underside impact and sheared the CIM right out of the black plastic. So... you know... we drove almost a whole match with a CIM hanging solely on its wires. (No way were we going to hit that E-Stop)

[lethc]

The same thing happened to us at the OKC regional. We believe that a bind was caused due to a broken PTO chain and resulted in a stripped gear. We are using these gears on our Vexpro ballshifter gearboxes.

[frcguy]

As promised: http://www.chiefdelphi.com/media/photos/43781