pic: FRC 2869 - 2016 Offseason bot

[Sperkowsky]

loading photo ...

[Dave McLaughlin]

What was the stress point?

[pilleya]

Originally Posted by Dave McLaughlin

What was the stress point?

From looking back at previous posts I believe they had problems with the cantilevering of the CIM+what looks to be a 2-3 stage VersaPlanetary from a plastic clamping gearbox. When going over defenses the Clamping Gearbox would fail.

[Ginger Power]

That thing looks pretty familiar

[BobbyVanNess]

Originally Posted by Ginger Power

That thing looks pretty familiar

That thing looks pretty familiar...

But seriously, we love that picture. That was a fun match.

[Sperkowsky]

Originally Posted by Dave McLaughlin

What was the stress point?

Alastair sorta explained it but I'll elaborate.

Essentially the output shaft of the tilt assembly (the one with the small sprocket on it) was cantilevered. Whenever the arm had a fair amount of velocity and stopped moving the chain would tug the shaft backward quickly causing the clamping gearbox to crack open.

[EmileH]

Originally Posted by Ginger Power

That thing looks pretty familiar

Yeah, it sure does.

[Sperkowsky]

Originally Posted by EmileH

Yeah, it sure does.

They was the robot I really took inspiration from. Until today I actually never saw 4607s robot. When designing the bot I found it to be a cross between 225 and 987.

[Ginger Power]

Originally Posted by BobbyVanNess

That thing looks pretty familiar...

But seriously, we love that picture. That was a fun match.

By far my favorite match of champs. Probably the most vivid FRC moment for me (I was watching as an inspector from the side of the field). You guys were awesome to compete against, hopefully we get a chance to compete in the future!

[pfreivald]

Had you considered putting a pneumatic spring on the intake/lift arm for stability, smoothness of operation, and reduced force necessary to lift it?

[Sperkowsky]

Originally Posted by pfreivald

Had you considered putting a pneumatic spring on the intake/lift arm for stability, smoothness of operation, and reduced force necessary to lift it?

Assuming a pneumatic spring and a gas shock are the same thing, it was considered although it was a bit to late when it was. If I were to do a similar thing again I'd use a powerful normally open gas shock and a winch.

[mastachyra]

I love how glossy the boulder is. It looks like a bowling ball that could actually destroy the castle!

[pfreivald]

Originally Posted by Sperkowsky

Assuming a pneumatic spring and a gas shock are the same thing, it was considered although it was a bit to late when it was. If I were to do a similar thing again I'd use a powerful normally open gas shock and a winch.

Yup, same thing!

[EmileH]

Originally Posted by Sperkowsky

Assuming a pneumatic spring and a gas shock are the same thing, it was considered although it was a bit to late when it was. If I were to do a similar thing again I'd use a powerful normally open gas shock and a winch.

4564 used a normally opened gas shock as well as a winch for their defense manipulator/intake arm this year. One drawback was that the arm would fall when crossing defenses like the Cheval De Frise or other rough defenses as the shocks would compress. This required them to lift the arm as they crossed the CDF and others slowing down crossing times. However overall this is a better solution than a motor at the hinge point as it puts significantly less strain on the system.

In this situation a linear actuator is also an option, allowing for very precise control with little backdrive. A good example of this is 1690, as their arm had very little flex and allowed for extremely high accuracy shooting.

[Sperkowsky]

Originally Posted by EmileH

In this situation a linear actuator is also an option, allowing for very precise control with little backdrive. A good example of this is 1690, as their arm had very little flex and allowed for extremely high accuracy shooting.

A linear actuater would have even awesome. Unfortunately I've heard nothing but awful things about darts and with a price as high as theirs I really decided not to consider them an option.