Metal Drill Gauge

What is a drill gauge?
Drill gauge is used to measure the different size of drill bits.

This is a commercial drill gauge it has 25 holes in it with the size of the hole beside it.



The tools that we focused on learning to use are Vernier Caliper and Micrometer.
Vernier Caliper

Vernier calliper is an extremely precise measuring instrument; the reading error is 1/20 mm = 0.05 mm. 

How to measure using a Vernier Caliper
Video

• The Vernier calliper is an extremely precise measuring instrument; the reading error is 1/20 mm = 0.05 mm.
• Close the jaws lightly on the object to be measured.
• If you are measuring something with a round cross-section, make sure that the axis of the object is perpendicular to the calliper. This is necessary to ensure that you are measuring the full diameter and not merely a chord.
• Use the bottom scale, which is in metric units.
• Notice that there is a fixed scale and a sliding scale.
• The boldface numbers on the fixed scale are centimetres.
• The tick marks on the fixed scale between the boldface numbers are millimetres.
• There are ten tick marks on the sliding scale. The left-most tick mark on the sliding scale will let you read from the fixed scale the number of whole millimetres that the jaws are opened.

Micrometre


How to measure using a Micrometre
Video


It's a device incorporating a calibrated screw widely used for accurate measurement. It operates by measuring the space between a hard stop (anvil) and a movable surface (spindle). When a thimble is turned it drives the spindle closer or farther away from the anvil. To take a measurement an object is placed between the anvil and the spindle and the thimble is spun until the object is gently pinched between the two faces. After the object is pinched the scale is read and a decimal measurement is derived. Once the object is secured in the clamp, you use the numbering system on the thimble which is the handle portion of the micrometre known as the sleeve.

Other materials that we used.

Ruler to measure where to mark out the line.

Odd leg Clipper used to mark out the curve on the end of the drill guage.

Scriber to draw the line on my work.

Engineer Square to mark out the straight lines.

Spring Divider engraving lines and the distance between each marking point.

Centre Punch to mark a point on where I'm drilling my work.
Hammer to hit the centre punch to make a dent.

Things that I've learnt in science

Chemical Change Versus Physical Change

A chemical change occurs when a new substance is formed. Physical change is not a permanent change. You can easily get the material that you started with.

Signs of Chemical Change:

• Gas has been given off.
• There is a colour change.
• There is a different smell.
• There is heat given out or absorbed.
• The change cannot easily reverse.

Signs of Physical Change:

• The substance changes state.
• The change can easily be reversed.
• No new substance is formed.
• The mass of the object is the same at the end of the change.

Atoms

Atoms are the smallest particle of a chemical element that can exist. Everything is made of atoms. Atoms are made up of 3 main types of particles: Electrons, Protons, and Neutrons.

Electrons are the tiny particles that have a negative electrical charge.

Protons are much larger and heavier than electrons and have the opposite charge. They have a positive charge.

Neutrons are large and have a similar mass to protons. Neutrons have no electrical charge.

Elements

Scientist have found more than 100 different types of atoms. A substance made of only one type of atom is called an element. Scientist have arranged all the known elements into a table called "The Periodic Table of Elements.