Posted by Chuck DeVore at 1/13/2001 5:44 PM EST
Other from Ckark Magnet High School sponsored by NASA.
I’m concerned that the bridge specs may be incorrect. I played with the bridge in New Hampshire and there was virtually no horizontal slop. If you follow the blueprints for the angle iron channel on the bottom of the bridge (#A1), you end up with approximately a 6 1/4 inch channel around a 3 1/2 in (4 x 4) board. Not only is there slop, but because the horizontal faces of the angle iron are “inside”, the rocking motion of the bridge causes these parts to “jump” on and off of the 4 x 4. It would “feel” right if the angle iron were reversed so that the horizontal side is outside, creating a flat channel approximately 4" wide.
Posted by Mike Faticanti at 1/13/2001 9:08 PM EST
Coach on team #157, AZTECHS, from Assabet Valley R.T.H.S. and Simplex/EMC²/Intel/Duke Engineering.
In Reply to: bridge specs
Posted by Chuck DeVore on 1/13/2001 5:44 PM EST:
Please read the Field BOM revised 1/8/01 Center Barrier
Item 64 Qty. 3, 4 x 6 Hem-Fir Lumber 96" not 4 x 4’s. The drawings are not the best but the info is there.
A3 and A4 sit on the 4 x 6 forming a hat shape around the beam. Hope this helps
: I’m concerned that the bridge specs may be incorrect. I played with the bridge in New Hampshire and there was virtually no horizontal slop. If you follow the blueprints for the angle iron channel on the bottom of the bridge (#A1), you end up with approximately a 6 1/4 inch channel around a 3 1/2 in (4 x 4) board. Not only is there slop, but because the horizontal faces of the angle iron are “inside”, the rocking motion of the bridge causes these parts to “jump” on and off of the 4 x 4. It would “feel” right if the angle iron were reversed so that the horizontal side is outside, creating a flat channel approximately 4" wide.
Posted by nick237 at 1/13/2001 9:40 PM EST
Engineer on team #237, sie h2o bots, from Watertown high school ct and sieman co.
In Reply to: Re: bridge specs
Posted by Mike Faticanti on 1/13/2001 9:08 PM EST:
NOPE. Not a clue…? A4 and A3 sit on top of the 4x6, where. A drawing would be the way to go, is it to much to ask for an end view that does not requier a microscope to understand for this VITAL part of the field…
nick237
: Please read the Field BOM revised 1/8/01 Center Barrier
: Item 64 Qty. 3, 4 x 6 Hem-Fir Lumber 96" not 4 x 4’s. The drawings are not the best but the info is there.
: A3 and A4 sit on the 4 x 6 forming a hat shape around the beam. Hope this helps
: : I’m concerned that the bridge specs may be incorrect. I played with the bridge in New Hampshire and there was virtually no horizontal slop. If you follow the blueprints for the angle iron channel on the bottom of the bridge (#A1), you end up with approximately a 6 1/4 inch channel around a 3 1/2 in (4 x 4) board. Not only is there slop, but because the horizontal faces of the angle iron are “inside”, the rocking motion of the bridge causes these parts to “jump” on and off of the 4 x 4. It would “feel” right if the angle iron were reversed so that the horizontal side is outside, creating a flat channel approximately 4" wide.