ask about bolt, and drill bit safety

diff --git a/guide/challenge-bot-questions.org b/guide/challenge-bot-questions.org
index 9da19687d63e3359765de3f5b6353c64310f55ec..7949fe77169ae1f2496acdde58c98b5ed64329fb 100644 (file)
--- a/guide/challenge-bot-questions.org
+++ b/guide/challenge-bot-questions.org
@@ -19,3 +19,9 @@
        1. could it have been placed diagonally?  why or why not?
        2. could it have been placed in any other location? why or why not?
        3. could it be upside-down?  why or why not?
        1. could it have been placed diagonally?  why or why not?
        2. could it have been placed in any other location? why or why not?
        3. could it be upside-down?  why or why not?

+    8. should we drill at full speed?  why or why not?
+    9. how can you break the drill bit when drilling?
+    10. the bolts used to attach the arduino are 6-32 bolts.  the bolts
+        used to attach the motor to the motor mount are 4-40 bolts.  Are
+        the 4-40 bolts fatter or thinner than the 6-32?
+    11. if you see a bolt described as =4-40x1.25=" how long is it?