interpreting engineering micrometer

Interpreting EngineeringInformationReece Hancock

Prelims• Fire Exit

• Mobiles turned off/ silent

• No smoking

• Questions- nominate/ wait for pause

• Notes- handout

• Content- power point/ open discussion

• Time 15mins

• Test/ confirmation

Introduction

Metric 0-25mm Micrometer

The aims and objectivesBy the end of the lesson the students will be able to read and interpret a precision engineering instrument.

• Understand the purpose of a micrometer

• Name the parts of a micrometer

• How to operate the micrometer

• Accurately read the information from a micrometer

Content

Introduction to a micrometer

Reading a precision instrument

Test on the parts of a micrometer

Test on reading a micrometer

Consolidation

Summary

Next Lesson

Metric 0-25mm MicrometerThe micrometer is a precision measuring instrument, used by engineers.

Each revolution of the ratchet moves the spindle face 0.5mm towards the anvil face.

The object to be measured is placed between the anvil face and the spindle face.

The ratchet is turned clockwise until the object is ‘trapped’ between these two surfaces and

the ratchet makes a ‘clicking’ noise.

This means that the ratchet cannot be tightened any more and the measurement can be

read.

Metric 0-25mm Micrometer

The micrometer is also available in a range of sizes:- 0-25mm,

25-50mm, 50-75mm………..

The micrometer when not in use must be stored in its supplied

case with it spanner to prevent damage.

Before using the micrometer it should be checked to see if it has

Quality Control (Q.C) sticker on the frame.

The daily use of a micrometer means that it should be checked

regularly during the course of the day. This can be achieved by

using a range of engineers slip gauges e.g. 5mm/10mm to prove

its accuracy.

The micrometer can be adjusted using its supplied spanner.

However this must only be completed by a trained person from

the quality control department.

0-25mm Micrometer Parts

Accurate to 0.01mm

The anvil and spindle face are made

from tungsten carbide to prevent

wear and maintain an accurate

surface to measure from.

Name the Micrometer Parts

F E DC

BHA

Anvil

face

Thimble Lock

Nut

Spindle

faceRachet Spindle Frame

G

Sleeve

Understanding the scale

Reading the scale

Example of Measuring Readings

12.66mm

16.355mm

7.76mm

12.66mm

16.355mm

7.76mm

Written Test

Name the Micrometer Parts

F E DC

BHA

Anvil

face

Thimble Lock

Nut

Spindle

faceRachet Spindle Frame

G

Sleeve

.ANSWER:

A

F

E

D

C

B

5.855mm

3.26mm

10.66mm

12.855mm

6.26mm

16.16mm

Consolidation• Understand the purpose of a micrometer

• Name the parts of a micrometer

• How to operate the micrometer

• Accurately read the information from a micrometer

Summary

Next lessonLooking at the imperial micrometer (Inches)

Reference• http://en.wikipedia.org/wiki/Micrometer

• http://its.foxvalleytech.com/MachShop1/Inspection/MetricMic.htm

• http://www.technologystudent.com/equip1/microm1.htm

• http://www.cityandguilds.com/qualifications-and-apprenticeships/engineering/mechanical/2850-engineering#tab=information&acc=level1

Pack away.

.ANSWER:

A

F

E

D

C

B

Name the Micrometer Parts

F E DC

BHA

Anvil

face

Thimble Lock

Nut

Spindle

faceRatchet Spindle Frame

G

Sleeve

Lesson Plan• Date 6/10/14 Monday

• Class Level 1 Engineering

• Introduction Metric 0-25mm Micrometer

• The aims and objectives By the end of the lesson the students will be able to read and interpret a precision engineering instrument.

Understand the purpose of a micrometer

Name the parts of a micrometer

How to operate the micrometer

Accurately read the information from a micrometer

Content Equipment Activity

• Introduction to a micrometer Using powerpoint Students take notes

• Reading a precision instrument Using powerpoint/ micrometer Students practice holding and using a micrometer. Q&A

• Test on the parts of a micrometer Handout of test on parts Students answer question paper

• Test on reading a micrometer Handout of test on reading Students answer question paper

• Consolidation Using powerpoint Students mark each others paper. Q&A

• Summary Using powerpoint Q&A

• Next Lesson Using powerpoint Make a note on next lesson’s topic

• Equipment needed

• Powerpoint presentation

• Micrometers

• Test papers

• Evaluation What went well …………………………………….. Areas for improvement……………………………………………