X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=curriculum%2Fchallenge-bot.scm;h=65d56ff9581f768adcdc75c7515e182c785db219;hb=9f6519960b3edc341066a6c9e138a9992fd7eb4d;hp=76dc7781a7133f338a04b10881f3e582af333956;hpb=ff0f6a781b4916b42634677c980935ccddbaad79;p=challenge-bot diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm index 76dc778..65d56ff 100644 --- a/curriculum/challenge-bot.scm +++ b/curriculum/challenge-bot.scm @@ -10,7 +10,7 @@ (subsection :title [arduino placement]) (subsection - :title [first hole and screw] + :title [first hole] (subsubsection :title [choosing drill bit]) (subsubsection @@ -18,24 +18,49 @@ (subsubsection :title [holding drill]) (subsubsection - :title [drilling]) + :title [drilling])) + (subsection + :title [first screw] (subsubsection - :title [6-32 by 3/8\" screw] - (p [the "6" part is how big around it is.]) - (p [the "32" part is how close the threads are to each other.]) - (p [the "head" is the flat part where some tool, like the alan - wrench, can exert force to spin the screw.])) + :title [fastening arduino to deck using #6-32x3/8\" screw] + (p [the "#6" part of "#6-32x3/8\"" is how big around the bolt is. + it is related to wire gauge. + bigger numbers mean larger screw. + smaller numbers means smaller screws.]) + (p [check + ,(itemize + (item + [in the motor assembly, there are #4-40x1.25\" screws. + are those fatter, thinner, or the same thickness as the + #6-32x3/8\" screws?]))]) + (p [the "32" part is a measurement of how close the threads are to + each other. + this is related to the angle of the thread, which is also + called pitch. + it is a count of how many times the thread wraps around one + inch of the screw body.]) + (p [the head is the flat part where some tool, like the alan + wrench, can exert force to spin the screw.]) + (p [check + ,(itemize + (item [how many times will the thread wrap around one inch of + the screw body?]) + (item [what about 2 inches? + how many times will the thread wrap around two + inches of the screw body?]))])) (subsubsection :title [fasten the arduino board to the deck] (p [push the 6-32 screw into the deck from the underside and at the same time, spin the 6-32 screw clockwise while looking - down on its head. twist until the bottom of the screw is + down on its head. + twist until the bottom of the screw is about to stick out on the top side of the deck.]) (p [hold the arduino board flat to the deck and line up the arduino - hole so the screw can come up through it. continue - tightening the screw into the deck, spinning the same - direction as before. tighten until the screw head touches - the deck. do not continue tightening]) + hole so the screw can come up through it. + continue tightening the screw into the deck, spinning the same + direction as before. + tighten until the screw head touches the deck. + do not continue tightening after that.]) (p [the arduino should still be flat against the deck still, just as it was before tightening the screw.])) (subsubsection @@ -44,7 +69,8 @@ can the arduino board still rotate a few degrees? warning, if you rotate the arduino board too much, you will unscrew it from the deck and you'll have to screw it - back in. rotating a few degrees should be ok.])) + back in. + rotating a few degrees should be ok.])) (subsubsection :title [arduino board move relative to deck] (p [without any screws, the arduino board can move independently of