pic: Banebot P60 Failure

[Swampdude]

Our failure point was those spring pins getting torqued off the flats also. All the gears are fine. We removed the spring pins and drilled out the pin holes for larger pins going deeper into the face plate. Then put divots where the pins interface the flats for the pins to seat in. Seems better than new this way and running good now.

[Jeffy]

Originally Posted by Swampdude

We removed the spring pins and drilled out the pin holes for larger pins going deeper into the face plate. Then put divots where the pins interface the flats for the pins to seat in. Seems better than new this way and running good now.

I am very interested to hear how this works out over the long run. I wonder if banebots designed these pins to shear off first to protect something more exspensive in the assembly.

[Jeff Waegelin]

I just want to say that they did not fail under "normal" use, they failed during a test in which I tried to get them to fail.

If they can fail in a test, there's a decent chance they can fail in a real situation, too... Wouldn't you rather fix it now, instead of hoping these same circumstances can never repeat themselves in competition?

Extra chain reduction and some surgical-tubing counterbalancing could solve your problem. BaneBots gearboxes work much better when you treat them nicely...

[thefro526]

Originally Posted by Jeff Waegelin

If they can fail in a test, there's a decent chance they can fail in a real situation, too... Wouldn't you rather fix it now, instead of hoping these same circumstances can never repeat themselves in competition?

Extra chain reduction and some surgical-tubing counterbalancing could solve your problem. BaneBots gearboxes work much better when you treat them nicely...

You're right, we are planning on modifying a few things to make the mechanism more "nice" to the P60's, though we don't feel that a full on redesign is necessary. There's already quite a bit of surgical tubing on the arm, and we plan on adding a bit more when we get our next McMaster-Carr order. We're also considering swapping out the drive sprocket to a 10 tooth which should make the transmissions see about 33% less torque during operation - not to mention that the arm should slow down a bit too.

I'm also going to look into the modification that Swampdude suggested and see if we're able to do it in our shop.