Originally Posted by Garrett.d.w (Post 1181848)

You can put a hex output shaft in a supershifter. You then connect the shaft directly to a hex bore wheel. You should support both sides of the shaft with bearings.

Situate the wheels where you want them, then rotate the supershifters around their output shafts until you find a suitable mounting position. With the design of your frame, you will probably be mounting to the face of the supershifter.

This year, ours wound up rotated about 45 degrees and mounted to the frame using L brackets.

If you want an example, I can provide a CAD model and pictures.

Originally Posted by IanW (Post 1181879)

Couple of things:

• The sheet thickness is almost certainly fine. See example below. However,
• Using a router to cut material will probably be challenging. As I understand it, the bit will tend to grab the material and yank it around with thin sheet. Granted, I don't personally have experience with this, but I've heard this said previously in other threads
• The sides are probably beefier than they need to be. Again, see example below

This past year my team and Team 1983 used a similar sheet metal design:
FRC 2374
FRC 1983
Both of these designs were from before kickoff and thus modified to address the challenges of the game.
Both teams only used one piece of sheet metal on the side panels, not a full box like you have. We then pop riveted the sheets to pieces of angle aluminum. Our rivets were on a 2" spacing. The chassis seemed to hold up quite well.

Good work though, good luck on your future iterations.

Originally Posted by rcmolloy (Post 1181788)

Yeah I would assume a 3/16" rivet every half inch should do you just fine. The current pattern seems to be way overkill.

Also, add some fillets to your pocketing patterns as well. It definitely helps the end mill for the router to eliminate the precise corners that you have going on there. Even more so, if you ran this, it will still have the mill's OD in each corner of your triangles. I would advise you make the fillets to your the mills exact OD or higher; never under.

Also, the normal/nominal thickness I have seen over the past years for sheet is a variance between .090" and 1/8". 1/8" for the beefier parts that require much of the static loads to be held and .090" for manipulation systems. (Correct me if I'm wrong guys haha)

Aside, it looks like a pretty decent sheet chassis.

Originally Posted by Matthew.Mc (Post 1181863)

If you could post a picture of a CAD model of how you mounted the Shifter it would be nice. Thanks

Originally Posted by Garrett.d.w (Post 1181883)

Here we go, hopefully this helps sort out my previous post (which after reading it again makes no sense).

The first pic is for context. The drivetrain is a 6wd West coast drive from this years competition robot. Even though the drive systems are different, the concept still holds true.Chains and extraneous hardware have been removed for clarity.


Here is a view of the rail.

And finally a fancy exploded view.