FRC 95, The Grasshoppers, Build Thread

[JamesCH95]

Originally Posted by Ty Tremblay

Are those 775s 1:1? I can't tell if that middle stage is a planetary or an integrated encoder. If it is an encoder, won't you be exceeding the maximum rpm for velocity control?

The 'booster' stage of the shooter is 1:1 on 775s. Our software/controls team advises me that the Talon SRX input can handle something above 100krpm with those encoders. I didn't do the math myself though.

Originally Posted by asid61

Beautiful CAD (as usual!) I have a few questions:
It looks a little too tall, but is it low-bar capable? I can't quite tell from the picture.
Are you planning to climb? What defenses can you break?
Are you worried about the whole thing racking under impacts?

Thank you!

We intend on being low-bar capable. The shooter folds into the chassis.

No climbing right now, unlikely to add it.

We plan on breaking low bar, ramparts, rough terrain, cheval de fries (sp?), moat, rock wall, sally port, portcullis (sp?), and to hold down the drawbridge for another team to quickly defeat.

All critical motion elements are isolated from chassis twisting, and the top/bottom of the shooter can handle a lot of misalignment with respect to each other. Think more gumby and less he-man

Originally Posted by s_forbes

Nice metal origami work on that belly pan! Looks like you didn't put in the holes with the plasma cutter, do you do them afterwards with a drill press / mill while the part is still flat, or after you bend it to match the holes to the other pieces?

Thank you! It was an interesting project, but all very doable with the right press-brake. We only played the aluminum drums on a few folds (brought the fold to 70-80deg on the brake and hammered them home).

For 'critical' plates like the drive pod plates we blank out the part on a CNC plasma cutter and then do all of the holes/fine features on a Prototrak CNC knee mill. For less critical items like the belly pan we will pierce all of the holes with the cnc plasma cutter, then slice the part out (still on the cnc plasma cutter).

I know the picture of the first belly-pan blank shows no pierces, we made a second pan with hole pierces and match-drilled the holes into that first blank by hand.