show how to twist tighten drill bit

diff --git a/curriculum/arduino-to-deck/2-twist-tighten-drill-teeth.png b/curriculum/arduino-to-deck/2-twist-tighten-drill-teeth.png
new file mode 100644 (file)
index 0000000..2da08be
Binary files /dev/null and b/curriculum/arduino-to-deck/2-twist-tighten-drill-teeth.png differ

diff --git a/curriculum/challenge-bot.scm b/curriculum/challenge-bot.scm
index 1ae84fda5749200cd3f2468639b0c9db87faa513..bcfc7b209decdadf102035f23a835d9cd26c06cd 100644 (file)
--- a/curriculum/challenge-bot.scm
+++ b/curriculum/challenge-bot.scm
@@ -45,7 +45,14 @@
                 (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.]))
+                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