Dot Rose

Day 98


April 8, 2011
Tap and Die

Day 98 - April 8, 2011 - Tap and Die

When I demonstrated simple machines to the second graders a week or so ago, they asked how screws are made. So, I got out my tap and die set to show them how threads can be cut, both on the outside of a screw or bolt and on the inside of a hole to receive it.