Any team facing the same problem as us ?
The photo seems to indicate stress being placed on the hub of the sprocket from mis-alignment rather than excessive torque which would tend to round out the square hole or possibly shear of the hub. Can you tell us or show us in what application you were using the sprocket? What condition was the shaft in that was removed from the sprocket?
You may want to consider using a metal lock bar with the sprocket to supplement the hubs’ load carrying capacity.
This sprocket was on a single shaft. The shaft that was removed from the sprocket was straight . The shaft had this sprocket on it and was placed with a motor .
Consider using a lock bar. http://www.vexrobotics.com/products/accessories/motion/276-2016.html
Or
A drive shaft lock bar. http://www.vexrobotics.com/products/accessories/structure/275-1065.html
Or
A drive shaft lock bar. http://www.vexrobotics.com/products/accessories/structure/275-1065.html
Okay , thanks for your advise . Will try the drive shaft lock bar since its much more sturdy.