[what would happen if the drill were twisted sideways while
the drill bit were in the wood?]))]))
(subsubsection
- :title [drilling screw hole]
+ :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])
: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.
+ bigger numbers mean larger screws.
smaller numbers means smaller screws.]
(figure :legend "arduino to deck / #6-32 screw"
(image :file
[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
- same time, spin the 6-32 screw clockwise while looking
- down on its head.
- twist until the bottom of the screw is
- about to stick out on the top side of the deck.])
+ (p [first we'll put the screw into the deck just enough so the deck
+ holds it in place.
+ then we will hold the arduino up to the screw and finish
+ tightening the screw down.
+ with the screw partially in, we do not have hold it as
+ rigidly while we are also holding the arduino and
+ the deck.])
+ (p [push the #6-32 screw into the deck from the underside.
+ the underside is the brown side.
+ at the same time, spin the 6-32 screw so it rotates
+ clockwise while looking down on its head.
+ twist until the tip 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
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.]))
+ as it was before tightening the screw.])
+ (p [check
+ ,(itemize
+ (item [why do we insert the first screw partially before
+ holding up the arduino?])
+ (item [which side of the deck is the top side?]))]))
(subsubsection
- :title [assessment]
- (p [does the arduino stay with the deck when the deck moves?
- 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.]))
+ :title [assessment of the first screw]
+ (itemize
+ (item [,(bold [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.])
+ (item [does the arduino stay with the deck when the deck moves?])
+ (item [can the arduino board still rotate a few degrees?]))))
+ (subsection
+ :title [second hole and screw]
(subsubsection
:title [arduino board move relative to deck]
(p [without any screws, the arduino board can move independently of
- the deck.])
- (p [with the first screw, the arduino can rotate around one point
- on the deck.])))
- (subsection
- :title [second hole and screw])
+ the deck.
+ it can translate and rotate freely.
+ with the first screw, the arduino can rotate around one
+ point on the deck and can no longer translate much.])
+ (p [the second screw limits rotation a lot.
+ it also makes translation even more difficult.
+ it might even be too small to be detectable by directly
+ looking at it.])
+ (p [to choose where the second hole and screw should go, we should
+ keep in mind that the goal is to attach the deck to the
+ arduino.
+ this means minimizing rotation and translation.
+ the picture below shows that the second hole should be as
+ far as possible from the first hole, since that minimizes
+ rotation.]
+ (figure :legend "arduino to deck / keep holes far apart"
+ (image :file "arduino-to-deck/keep-holes-far-apart.png"))))
+ (subsubsection
+ :title [drilling and attaching second screw]
+ (p [to drill the second hole, follow the same steps as drilling the
+ first hole.
+ hold the arduino down as before, and drill through the hole
+ furthest away from the first hole.
+ then insert and tighten the screw as before.])))
(subsection
:title [third and fourth hole and screw]))
(section
projects / challenge-bot / blobdiff