:title [challenge-bot]
(chapter
:title [mechanical]
+ (p [let's build your robot!])
(section
:title [arduino to deck]
+ (p [let's attach the arduino to the deck.])
(subsection
:title [required materials]
(p [you will need the things in this picture.
(item [alan wrench])
(item [wood block])
(item [arduino])
- (item [#6-32x3/8\", four of them]))]))
+ (item [#6-32x3/8\", four of them])
+ (item [robot deck, the white thing with a grid of holes1]))]))
(subsection
:title [first hole]
(subsubsection
:title [choosing drill bit]
- (p [choosing the right drill bit depends on what job you are doing.
- right now, we are making holes for screws to hold the
- arduino to the deck.
- this means the hole needs to be big enough for the
- screw body to fit through.
- we want the screw to stay put once it's in place.
- we also want the drill bit to be smaller than the
- diameter of the thread.
- the screw was chosen so that the hole on the arduino
- was bigger than the body and smaller than the thread.
- we will choose the biggest drill bit that fits through
- the hole on the arduino.])
- (p [here's a diagram of a screw]
- (figure :legend "screw" (image :file "arduino-to-deck/screw.png"))))
+ (p [the arduino comes with holes in it already, so we will make
+ some choices around those holes.
+ choosing the right drill bit depends on what job you are
+ doing.
+ right now, we are making holes for screws to hold the
+ arduino to the deck.
+ there are two constraints between the hole and screw.
+ each hole needs to be big enough for the screw body to fit
+ through it.
+ the holes also need to be smaller than the screw's thread.
+ since there are holes on the arduino already, the screw was
+ chosen to match it.
+ the screw was chosen so that the hole on the arduino was
+ bigger than the screw body and smaller than its thread.
+ we will choose the biggest drill bit that fits through the
+ hole on the arduino, then use that to drill holes in the
+ deck.])
+ (p [here's a cross section of a screw in the deck]
+ (figure :legend "screw cross section"
+ (image :file
+ "arduino-to-deck/screw-cross-section.png")))
+ (p [check
+ ,(itemize
+ (item
+ [what would happen if the drill bit were larger than the
+ screw thread?])
+ (item
+ [what would happen if the drill bit were smaller than the
+ screw body?]))]))
(subsubsection
:title [inserting drill bit]
(p (figure :legend "arduino to deck / insert bit"
[while holding the drill bit, twist end of the drill to tighten
the teeth.
make sure that the teeth end up gripping the flat part of
- the drill bit.]))
+ the drill bit.])
+ (p [check
+ ,(itemize
+ (item
+ [where should the teeth clamp down on the drill bit?])
+ (item
+ [what would happen if the teeth tightened on the recessed
+ part of the drill bit?]))]))
(subsubsection
- :title [holding drill])
+ :title [holding drill]
+ (p [hold the drill with one hand on the handle and trigger.
+ put the other hand on the orange nozzle, before the
+ black spinning part.]))
(subsubsection
:title [arduino placement]
(p [the arduino should be placed as shown in this picture.]
the green circle shows where the hole is.
the blue box encloses the arduino hole and two deck holes.
place the arduino hole mid-way between the two
- deck holes.]))
+ deck holes.])
+ (p [check
+ ,(itemize
+ (item
+ [should the arduino be upside-down?])
+ (item
+ [what should the upper side of the arduino align with?])
+ (item
+ [why not place the arduino up along the left side of the
+ robot?]))]))
(subsubsection
- :title [drilling]))
+ :title [drilling]
+ (p [place the drill bit in position.
+ brint the drill up to full speed, and keep it full speed.
+ push down until the drill bit has passed through the
+ deck.
+ keep the drill at full speed.
+ stop before the drill smashes into the arduino.
+ keep the drill at full speed by holding the trigger.
+ bring the drill straight back up.
+ hold the trigger down to keep the drill at full speed.
+ once the drill is back out of the hole, let go of the
+ trigger.])
+ (p [check
+ ,(itemize
+ (item
+ [should the drill be at full speed while the drill bit is
+ going down into the wood and coming back up?])
+ (item
+ [what would happen if the drill bit were not at full
+ speed?])
+ (item
+ [how do you keep the drill at full speed?]))])))
(subsection
:title [first screw]
(subsubsection
(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.])
+ smaller numbers means smaller screws.]
+ (figure :legend "arduino to deck / #6-32 screw"
+ (image :file
+ "arduino-to-deck/6-32-screw.png")))
(p [check
,(itemize
(item
projects / challenge-bot / blobdiff