: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 [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"))))
+ "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]
(p [hold the drill with one hand on the handle and trigger.
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
projects / challenge-bot / blobdiff