: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])
+ :title [choosing drill bit]
+ (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])
+ :title [inserting drill bit]
+ (p (figure :legend "arduino to deck / insert bit"
+ (image :file "arduino-to-deck/1-insert-bit.png"))
+ [insert the drill bit into the teeth of the drill.
+ insert it far enough that the teeth will clamp on the
+ smooth part of the bit when they are tightened.])
+ (p (figure
+ :legend "arduino to deck / twist tighten drill teeth"
+ (image :file "arduino-to-deck/2-twist-tighten-drill-teeth.png"))
+ [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.])
+ (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.]
(figure :legend "arduino to deck / place arduino"
- (image :file "arduino-to-deck/3-place-arduino.png"))
- [here's a closeup]
+ (image :file "arduino-to-deck/3-place-arduino.png")))
+ (p [here's a closeup]
(figure :legend "arduino to deck / place arduino closeup"
(image :file
"arduino-to-deck/4-place-arduino-closeup.png"))
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 practice]
+ (p [strength check]
+ (itemize
+ (item [put on safety goggles])
+ (item [unplug drill])
+ (item [hold drill in one hand])
+ (item [point drill at the ground])
+ (item [point drill at the wall])))
+ (p [steps for drilling into wood block]
+ (itemize
+ (item [plug in the drill])
+ (item [place the drill bit in position])
+ (item [bring the drill up to full speed, and keep it at full
+ speed while lowering and raising the drill])
+ (item [push down until the drill bit has passed through an inch
+ of the wood block])
+ (item [keep the drill at full speed])
+ (item [stop before the drill smashes into the wood block])
+ (item [keep the drill at full speed by holding the trigger])
+ (item [bring the drill straight back up])
+ (item [hold the trigger down to keep the drill at full speed])
+ (item [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
+ [how do you keep the drill at full speed?])
+ (item
+ [what would happen if the drill bit were not at full
+ speed?])
+ (item
+ [what would happen if the drill were twisted sideways while
+ the drill bit were in the wood?]))]))
+ (subsubsection
+ :title [drilling the first screw hole]
+ (itemize
+ (item [place the drill bit in position])
+ (item [bring the drill up to full speed, and keep it full speed])
+ (item [push down until the drill bit has passed through the
+ deck])
+ (item [keep the drill at full speed])
+ (item [stop before the drill smashes into the arduino])
+ (item [keep the drill at full speed by holding the trigger])
+ (item [bring the drill straight back up])
+ (item [hold the trigger down to keep the drill at full speed])
+ (item [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
: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.])
+ bigger numbers mean larger 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
[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.
+ (p [the "32" part of "#6-32x3/8\"" 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
the screw body?])
(item [what about 2 inches?
how many times will the thread wrap around two
- inches of the screw body?]))]))
+ inches of the screw body?])
+ (item [where can a tool exert turning force on
+ the screw?]))]))
(subsubsection
:title [fasten the arduino board to the deck]
(p [push the 6-32 screw into the deck from the underside and at the
projects / challenge-bot / blobdiff