Don’t be so sure about the one defined in the game manual. From the beginning of the Arena section:
GE-13019 shows a 60 degree angle in the official drawings, which according to the manual have precedence. Hopefully we’ll get something in the first update
I think I figured it out. If you look at page 56 of game specific drawings. There is a marking for 60 degrees. 60 is the angle between the 4 corner posts, and the horizontal plane.
68 is the angle between the horizontal members and the corner posts in the plane of the side.
The angle between the horizontal plane and the corner posts is different from the angle in the plane of one of the 4 triangular sides between the horizontal bars and the corner posts.
Visual aid two pencils in an L shape tilt the vertical pencil so it is 30 degrees off the table, its angle to the horizontal plane is 30, but the angle to the other pencil in the plane they share is still 90.
Additional hat tip to ZehP who did the math while I did my thought experiment:
I still don’t see this fully…can someone post a drawn out visual of this?
We built 2 here in Cincy, at least materials for 2. We built one for the Kickoff, which we left for Team 144 to use and have the materials for a 2nd at our shop. Once assembled it will stay up for the duration and be available for all area teams to use.
We also only built the feeder/Low goal combo and the High goal. Since the high goal and the middle goal overlap, we figure that if you can hit the high goal, you can hit the middle goal.
Team 2068 would like to thank our school’s construction technology teacher for agreeing to build an “almost official” pyramid. It may not be done by this weekend but we can probably make it available for teams in Northern Virginia if you let us know you are coming. PM me for directions and such, I will post when its done as well.
Like Caltran said, I suspect our team will use the CNC plasma cutter and cut out the plates. They will need some love to look good but should otherwise be very accurate. I imagine for material cost we might be able to make some more for local FRC teams.
-Mike
FRC Team 3313 Mechatronics from Alexandria, MN has built an entire field wall out of plywood. Kinda crazy, we know. We are very fortunate to have the space to store them in our school’s (former) automobile repair shop.
One of our sponsors is also building a pyramid out of steel using technical drawings for us.
Any teams in out state MN who would like to use them, please PM me, email me at [email protected], or tweet at us @Team3313.
Ill try to draw something up based on the PDF
Edit: Tried to show how the angles are measured (what planes they are measured in)
http://i.imgur.com/x8Fa3.png
I made a thread to capture teams that are allowing others to use their field elements.
http://www.chiefdelphi.com/forums/showthread.php?p=1210534#post1210534
On the 104" pipe it calls for 7 holes drilled in each one I know what the
One is for but don’t see what the other ones are being used for.
Or through hole for screw in 60dg block
David
I would just also throw a word of caution to any team trying to build the pyramid because of safety hazards and structural integrety. I would personally build the scoring goals instead.
But dont let me dampen your experience, if you want to build a pyramid, test it and make sure that it is secure and strong enough before attempting any practice let alone horseplay near or on the apparatus.
G02
Teams may not climb on the PYRAMID.
Violation: YELLOW CARD
I was thinking we might want to implement this rule during build season…
We are planning on building enough of a pyramid to test our robot’s ability to climb it. So far, it looks like we’ll need one horizontal bar, 30" off the floor. We haven’t figured out a way to climb any higher than that.
I priced .095" wall 1.50" structural steel tube at the local welding/steel supplier, it goes for $2.00/ft in full lengths (20 ft), and $2.50/ft if cut to a specific length. How much do we need?
Team 708 built the pyramid on Sunday. We noticed a few things of extreme importance. First was that the hole in the wooden corner brackets when drilled to spec was too large. We drilled a 2 1/4 inch hole instead, then sanded down the points of contact (allowing the pole to take the angle of the support 2x4). It is very important to ensure that the holes for the u brackets are correct. We also noticed that the u-bolts (purchased at Lowes) were not made to a tight tolerance. The fabrication of the necessary pieces took about 6 hours, and construction took about 2 hours. If you plan on constructing I would suggest acquiring a 4 inch deep socket the size of the nut for the u bolt. This will save you a lot of aggravation. When assembled the pyramid seemed very sturdy, enough that one of our mentors (200 + lbs) felt comfortable enough to do a few pull ups on the third rung. Our team has also instituted a no climbing rule!!!
If there are any teams in the philly area that don’t have the time, space, or means to build the pyramid send me an email ([email protected]) and we’d be happy to have you over.
We used 1-1/4 EMT. Its about 1/3 the cost of black pipe, a lot easier to cut, and measures 1.51 OD. It is plenty strong. We will be welding ours in the near future. I don’t think the u-bolts and plywood will withstand many climbs.
Have you considered a polytarp with appropriate holes cut and taped. It could then be fastened to a piece of EMT and slung from roof trusses. No chains behind the holes but it’s cheap, easy to make and easy to store.
EMT is usually galvanized. Should only be welded with proper precautions. (Google “Metal Fume Fever” for details.)
-Karlis
I got Schedule 10 black pipe sprinkler line @ $1.00 a ft. Came out of a plumbing supply house.
David
We are building a scaled version of the pyramid to test out some scaled mechanisms on the pyramid, and so we can get a feel for how climbing can be done.
This is partially because if we did build an actual pyramid, it would be too tall and take up about 60% of our workspace.
