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Precision Machining: Lathe Identification



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Jones here and we're going to cover some

of the basic components of the closing

Colchester 15 inch lathe which we use

here and the machine shop the machines

in front of us is a Colchester lay it is

a 15 inch machine which means it has a

15 inch swing swing is measured in the

maximum diameter that can be machined

here we have the headstock the headstock

contains all the gearing for the spindle

and all of the gearing for the feed

components as well as the face with all

the settings for those down in the tail

the head flight down here at the bottom

the bottom of the head base is where the

motor is at there are basically two

types of lathe there are engine lathes

and there are gear head lays gear head

lathes turn on instantly once the motor

is started and turned off the spindle

will stop a engine lathe which is this

component has a clutch setup so that the

motor will turn on and the motor will

consistently run but there's a clutch

that controls the spindle this is your

speed guide and for this unit you match

up there are four sections there's four

colors you can adjust to different

ranges and then adjust the speeds inside

those ranges once you have calculated

your RPMs you have your feed selections

for your low and high range your right

and left threading direction your ABC

the rst and the one through eight quick

change gearbox these are what will set

the feeds the w x y and z levers here Y

is used for feed W is used for threading

and why is set right here this is your

feed rates you have inches per

revolution so for example if we wanted

ten thousands per revolution feed we

would set it at LCR six so we would have

L C R and then six on our gearbox this

is the power button this starts the

motor there's a stop button stops the

motor this is your coolant pump we're

going to leave that off this your

indicator light tells you if the machine

is on ones before turning on the power

we're going to do a couple of things to

make sure everything is intact before we

get to that we're going to identify the

rest of the parts this is your spindle

this is driven out of the head of the

machine to that spindle we attach a

chuck we can - this is a three jaw

scroll Chuck or three joy Universal

Chuck

all three jaws move in and out the same

by using a chuck wrench your Chuck

wrench goes into the top of the chuck

and you tighten it or loosen it do not

leave the chuck ranch and the Chuck this

is the biggest nono you can perform on

this machine if your hand comes off of

this of the spin off the chuck that's

Chuck wrench needs to be in your hand do

not leave it in there you have the bed

ways of your machine there's one on

either side to that bed is your carriage

this is your carriage right here your

carriage moves up and down the bed your

carriage contains your cross slide your

compound and your tool posts the tool

post is where your tool holder attaches

where your cutting tool says

you have a hand wheel that moves the

carriage up and down the bed you have

your cross slide hand wheel that moves

the cross slide in and out and you have

your compound hand wheel that moves the

compound in and out at the end of the

machine we have the tail stock tail

stock is used for many different things

the lathe tail stock slides up and down

on the bed ways towards and back from

the head stock this is the body of the

tail stock this is the barrel this is

the barrel hand wheel the hand wheel

brings the barrel in and out of the body

inside the barrel is tapered with a

number four Morse taper on this

particular unit and inside that tail

stock you can put a live Center or a

chuck to hold a center drill drill

whatever the case may be that will go in

here that you can use on the end of the

part either to center drill drill

whatever case may be the drive of the

machine is controlled by the apron

controls as control the movement of the

carriage up and down the bed you have a

threading rod this is the lead screw

that allows the machine to thread this

is the driving rod right here this is

what sends the power directly to the

carriage and then you have the clutch

guide rod this rod runs the length of

the machine and allows the clutch to be

engaged or disengaged once the RPM have

been calculated which we will cover

later you would set your rpms for

whatever your particular use would be

then you would set your feed rates now

if you're using the power feed this is

your power feed control right here this

is the power feed lever this engages the

power to the carriage to travel back and

forth or for the cross slide these two

knobs right here are the apron control

knobs they you have a knob that controls

the function and another controls the

direction the manipulation of these two

knobs allow the carriage to move forward

towards the headstock reverse towards

the tail stock or when set for the cross

slide the cross slide to go forward or

the cross slide to go back by the

engagement of the power engagement lever

right here we'll go over those next this

is your half nut engagement lever this

is what enables the machine to thread

this is you're threading dial right here

these all work in synch with the lead

screw to allow the throat machine to

thread this is one of your clutch

engagement levers this is what actually

engages the clutch to allow the spindle

to rotate there is another one here on

this edge now the knot the lever on the

left of the machine will only engage in

a forward rotation by simply lifting it

upwards this engagement lever when

lifted up starts the clutch and a

forward rotation it will also function

in a reverse move human

the lever outwards towards the tailstock

and down and it will cause a reverse

rotation this is your foot break at any

time you step on this break it will

disengage your clutch and stop the

spindle from turning if you have the

spindle engaged and you step on the foot

break it will stop the clutch the motor

will continue to run but the spindle

itself will stop these are the basic

components of the lathe in a separate

video we will show you how to check a

part a just the spindle speed adjust the

feed rate make the necessary adjustments

to make the machine function and what to

do prior to powering up the machine this

is just a basic coverage of the parts of

the machine