attach motor to motor mount

diff --git a/guide/3-motor-assemblies/1-motor-mount/1-motor-mount-to-motor.ogv b/guide/3-motor-assemblies/1-motor-mount/1-motor-mount-to-motor.ogv
new file mode 100644 (file)
index 0000000..46dd8f1
Binary files /dev/null and b/guide/3-motor-assemblies/1-motor-mount/1-motor-mount-to-motor.ogv differ

diff --git a/guide/challenge-bot.scm b/guide/challenge-bot.scm
index f121f3f5500757792cd37edd6eb45d8fc8fc886f..0d2a7eee854db108f0bc86e81ff086cf2c857f65 100644 (file)
--- a/guide/challenge-bot.scm
+++ b/guide/challenge-bot.scm
@@ -533,7 +533,25 @@
      (item [why should the motor mounts have angle brackets attached in
                    a mirror image fashion?])))
     (subsubsection
-     :title [motor mount to motor]))
+     :title [motor mount to motor]
+     (p [now attach the motor mount with angle brackets to the motor.])
+     (figure
+      :legend "motor / mount / mount to motor"
+      (video
+       :file
+       "3-motor-assemblies/1-motor-mount/1-motor-mount-to-motor.ogv"))
+     (p [we will attach the motor mount to the motor using #4 bolts.
+            these screws are thinner than the #6 bolts we have used.
+            to clamp down on the motor, we will use a #4 nut.
+            the white side of the nut should face outward.
+            this section of the nut will keep the nut from jiggling
+            loose off the bolt during normal operation.
+            the head of the #4 bolt is a philips head, so we will
+            use a philips head driver for it.])
+     (p [check])
+     (enumerate
+      (item [is the #4 bolt thicker or thinner than the #6?])
+      (item [do you have a ratcheting socket wrench, or not?]))))
    (subsection
     :title [deck attachment]))
   (section