X-Git-Url: http://challenge-bot.com/repos/?p=challenge-bot;a=blobdiff_plain;f=guide%2Fchallenge-bot-questions.org;h=180dcda7672547c490401aed64055f55b200a997;hp=4246fe3acc435449a6ba615c202a891cbe17be13;hb=c8a4b2d2117137083e9dc0be95187e58cd01ae1e;hpb=38cbf5735a15d731c850dc94fd9acc60be6b5e81 diff --git a/guide/challenge-bot-questions.org b/guide/challenge-bot-questions.org index 4246fe3..180dcda 100644 --- a/guide/challenge-bot-questions.org +++ b/guide/challenge-bot-questions.org @@ -1,41 +1,91 @@ -* challenge-bot questions -** mechanical questions -*** arduino to deck - these questions are about attaching the arduino to the deck. - you used a drill and drill bit to make holes for bolts to go - through. - we drilled through the arduino into the deck. - 1. what would happen if you used a larger drill bit than the one - you used for drilling holes for the arduino? - 2. why did we use a drill bit that was wider than the body of the - bolt used to hold the arduino? - 3. why do people use drill bits that are smaller or the same size as - existing holes in circuit boards, like the holes in the blue - arduino? - 4. why did we drill through the arduino, rather than marking holes - and using the drill to make holes where the marks were? - 5. how does the drill hold onto the drill bit? - 6. what would happen if the drill bit teeth were not flat on the - drill bit? - 7. name some reasons for the arduinos placement on the deck. - 1. could it have been placed diagonally? why or why not? - 2. could it have been placed in any other location? why or why not? - 3. could it be upside-down? why or why not? - 8. should we drill at full speed? - why or why not? - 9. how can you break the drill bit when drilling? - 10. the bolts used to attach the arduino are 6-32 bolts. - the bolts used to attach the motor to the motor mount are - 4-40 bolts. - Are the 4-40 bolts fatter or thinner than the 6-32? - 11. if you see a bolt described as =4-40x1.25=" how long is it? - 12. on a =4-40= bolt, how many times does the thread wrap around - one inch of the body? - 4 times? +#+OPTIONS: toc:nil +#+LaTeX_HEADER: \linespread{2.75} +* arduino to deck + these questions are about attaching the arduino to the deck. + you used a drill and drill bit to make holes for bolts to go + through. + we drilled through the arduino into the deck. + 1. what would happen if you used a larger drill bit than the one + you used when drilling holes through the arduino? + 2. why did we use a drill bit that was wider than the body of the + bolt used to hold the arduino? + 3. why do people use drill bits that are smaller or the same size as + existing holes in circuit boards, like the holes in the blue + arduino? + 4. why did we drill through the arduino, rather than marking holes + and using the drill to make holes where the marks were? + 5. how does the drill hold onto the drill bit? + 6. what would happen if the drill bit teeth were not flat on the + drill bit? + 7. how can you break the drill bit when drilling? + 8. should we drill at full speed? + why or why not? + 9. name some reasons for the arduinos placement on the deck. + 1. could it have been placed diagonally? why or why not? + 2. could it have been placed in any other location? why or why not? + 3. could it be upside-down? why or why not? +* motor + these questions are about attaching the motor to the deck. + to attach the motor to the deck, first we attached motor mounts. + the motor mounts are the square things with 6 holes of + various sizes. + 1. the bolts used to attach the arduino are =6-32= bolts. + the bolts used to attach the motor to the motor mount are + =4-40= bolts. + Are the =4-40= bolts fatter or thinner than the =6-32=? + 2. if you see a bolt described as =4-40x1.25"= how long is it? + 3. on a =4-40= bolt, how many times does the thread wrap around + one inch of the body? + 4 times? + 40 times? + 1. how many times does the thread of a =4-40= bolt wrap around + two inches of the body? + 8 times? 40 times? - 1. how many times does the thread of a =4-40= bolt wrap around - two inches of the body? - 8 times? - 40 times? - 80 times? - 13. what part of the screw does the screw driver go into? + 80 times? + 4. what part of the screw does the screw driver go into? + 5. why are the motors between the wheels? + 6. why do we wrap tape around the body of the motors? + 7. why are the motors pointed towards the caster in the back? + 8. why do we put a zip tie around the motor? +* breadboard + the breadboard is the white thing in the middle of the deck. + it has a black thing plugged into it. + almost everything with wires plugs into the breadboard. + 1. where is the breadboard? + 2. what's the difference between stranded and solid core wire? + 3. why are we using solid core wire for plugging into + the breadboard? + 4. do we have the black chip (motor controller) be on the left or + the right of the breadboard? + 5. why should the chip be on the right on our robot? +* batteries + there are two battery packs on the robot. + one of them powers the motors, and is in the clear battery pack. + the black battery pack powers the arduino. + 1. why are the battery packs between the wheels and caster + (roughly)? + 2. should you pick up a battery by the wires coming out of it? + 3. what are the wires coming out of the battery called? + 4. why do we put the glue dots on the side of the battery pack + without the on/off switch? +* caster + the caster is the solid metal sphere. + it is held in a 3d printed plastic housing called the caster standoff. + the standoff is fixed to the deck with 3 nuts and bolts. + 1. where is the caster? + 2. why is the caster in the middle of the back, instead of on the + left or right? + 3. what would happen if there were no caster on the back + of the robot? +* tools + 1. do you have a ratcheting socket wrench? + what is a ratcheting socket wrench? + 2. what is the socket wrench used on? + 3. what are the pliers? + 4. what do you use to remove the colored part from a wire? +* misc + 1. what is the robot tread made out of? + 2. why is it difficult to push the sonar into the sonar holder? + 3. what would happen if the sonar were easy to push into the sonar + holder?