show how to twist tighten drill bit

[challenge-bot] / curriculum / challenge-bot.scm

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 933c0fa080c8e7150f82b11019ddb8be349c0352..bcfc7b209decdadf102035f23a835d9cd26c06cd 100644 (file)
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -40,7 +40,19 @@
      (p [here's a diagram of a screw]
         (figure :legend "screw" (image :file "arduino-to-deck/screw.png"))))
     (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.]))
     (subsubsection
      :title [holding drill])
     (subsubsection