2. Pick:
Stock: 1⁄2-in. square tool steel, 8 ins.
Directions: Mark the middle of the bar with a centre-punch. Punch the hole through with the eye punch. Put in a drift pin and flatten down the bulged sides of the bar made by punching the hole. Draw the two ends out to a sharp square point. This should make the pick not more than 10 ins. long. The drawing should show the shape it will be when finished. These picks are hardened the same as cold chisels, and tempered at the purple colour.
ROCK DRILLS (USED WITH MACHINERY)
As the name indicates, these drills are used for making holes in rocks when blasting is to be done. The form and shapes most in use are shown here.
The double drill, used so much in power drilling machines, is made in the following way: Take a 1-in. octagonal bar of steel, any length. Heat one end, and upset it to 11⁄4 in. in diameter. Put a small 1⁄2-in. fuller on the anvil and place the end of the bar lengthwise on the fuller. Put the top fuller directly above this and strike with a sledge hammer. The result is two fuller marks driven down within 1⁄2 in. of meeting. Reverse this and do the same on the other two sides. This marks a cross.
Tools for rock drills used in machines
