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CNC Mill Tutorial



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this is the CNC mill you can use it to

make any projects for classes or even

for fun I'm going to show you a typical

way to set up your stock in the mill

right now it's mounted to this block

these are called parallels they're

machined in sets so they're perfectly

flat and square to each other we're

gonna use these to help mount our stock

in the vise so before you put anything

in the vise you want to make sure that

it's clear of any debris this just

ensures that you have a flat surface to

mount your part on so we're gonna put

these parallels up at either end of the

vise and then we're going to step our

set our stock on the parallels so the

bottom edge is resting on top of these

parallels and the edges are gonna get

squeezed in by the vise I'm going to put

my master cam origin in the back left

corner once it's in there like that I'm

going to use this handle here that's

just to the right on this rack to

tighten this down into the vise

it's not necessary for it to be overly

tight next I'm checking that these

parallels are stuck underneath it see

how they can move we're going to use

this rubber mallet to hammer down the

stock so that those parallels can't move

underneath it now they're not moving

that insures that the stock is

completely flat in the vise now

now that your stock is in the machine

you're gonna have to tell the machine or

the stock is located to do that I use

the edge finder tool which is located in

tool for over here I want to bring it up

into the spindle so I can use that to do

that I need to do an automatic tool

change the door of the machine needs to

be closed for it to do this then I'm

going to get into the correct mode or

menu to move this over these buttons

here I call motor menu buttons that'll

get you into the correct mode in order

to dual tool changes or to move the

table around this MDI DNC button MDI

stands for manual data input will get

you into their correct mode to move the

tool because it's several tools away

from where we're located now I'm going

to type in the tool number so a t4 tool

for for the fourth slot after you do

this you press a TC forward or reverse

will do the same thing and a TC stands

for automatic tool change all right so

now the edge finder is in the tool slot

I'm going to show you really quickly how

to take the tool in and out there's a

button right behind this that you press

to release the tool when you press it

the tool will drop out of the spindle so

make sure holding on to it

this here is the edge finder tool see

how the tip of this can move back and

forth how this works is it's going to be

in the spindle

it'll be rotating and this will be

wobbling around you're gonna bring your

stock in and close until it hits this

edge finder and then it'll push it to go

concentric with itself and it won't be

wobbling anymore at this point you're

gonna go really slowly and bring the

stock in even closer until it bumps off

to the right that's when you have found

the edge of your stock relative to the

edge of this tool you need to tell the

Machine where the center of this tool is

over the edge of the stock because that

would be the center of every tool in the

machine relative to the edge of the

stock to do this you have to compensate

for the radius of the tool which is 0.1

inches and I'll show you guys an easy

way to do that first you have to put the

tool back into the machine hold it just

like this sort of like an ice cream cone

some tools have more to hang on to but

in this case you can just rest it on

your hand you're gonna want to line

these notches up with the pegs and the

spindle the machine will grab onto the

tool even if you don't have those

notches lined up but you can risk

throwing the tools the spindle turns on

so you want to ensure that it's lined up

correctly also it will grab onto the

tool if your fingers are in the way so

make sure they remain underneath because

it's going to grab onto this upper lip

here so line up the notches press the

button when you release it it will pull

it into the spindle

just like that

now that the tool is in the spindle

we're going to need to move it into the

location to start finding that back edge

of the part to do that I have to get

into a different mode I'm going to go

right to this handle jog mode that will

let me move the table and spindle around

next to that handle jog is the

increments at which you're moving it we

just start at this point oh one that's

about as fast as we move so we don't

risk crashing the spindle into anything

now over here you have your x y&z plus

or minus doesn't matter

but you'll determine the direction with

this dial so X moves the table left and

right Y moves the table forward and

backwards and Z moves the spindle up and

down so I'm just gonna move it till the

edge finder is right behind this stock

here

now that the spindles in a good location

to start I'm going to start the spindle

up moving an edge finder works best at a

thousand rpm however the door of the

machine has to be closed if you're

running at over 750 rpm because it's

easier to see what's going on with the

door open we're just gonna run it at 750

to do that I type in 752 this keypad and

then I press clockwise CW to startup the

spindle since this is already wobbling

you don't have to flick it but if it was

concentric to start with like that you

just have to reach in and flick it so it

starts wobbling keep in mind this is the

only tool you're gonna touch when it's

spinning now that it's all started I'm

going to bring it in in the y-direction

since I'm close I'm going to go down one

increment lower just so I have more

precision

it's starting to go concentric now now

I'm going to go slower

until it just steps off like that I'm

going to stop the spindle here with this

stop button right next to clockwise that

started it up

now that you've found the edge of that

part you're gonna want to tell the

Machine where that zero is to do that

we're going to want to switch into this

work zero offset menu and work in this

g54 line here just switch to that menu

you're gonna press this offset button

and that'll highlight this menu we're

working in we just zeroed it in the

y-direction so I'm going to use these

cursor arrows to make sure that yellow

box is in the y-axis and in the g54 line

now I'm going to use this part zero set

button and that will zero it out where

that tool currently is so you can double

check in this work g54 and why that's

all zeros now because we just zeroed it

there now we have to compensate for the

radius of the tool an easy way I like to

do this is to just bring the spindle up

away from the part and then bring it

over in the y-direction

until that is point 1 and then

double-check that the tool Center is

over the edge of the part and not

further way now that I have this new

zero where the center of the tool is

over the edge I'm going to go back into

that y-axis and reesy row that with this

new position that's how you compensate

for the radius of the tool the same

process will be used for the x-direction

we're just going to bring the edge

finder over to this side and find off of

this edge here

the only difference with finding zero on

this edge is that when the tool goes

concentric and breaks off its gonna

break off towards the back of the

machine instead of towards the right

like we did on this back edge that's

going to make it difficult to see if

you're looking at it straight on so what

I like to do is when the tool goes

concentric I stick my head in the

machine and with one hand keep moving

the dial but be looking at it from the

edge so you can see it break off easily

now that we're in position I'm just

gonna start the spindle up again make

sure it's wobbling and then start

bringing it in with a smaller increment

now that it goes concentric I'm going to

look in and make sure it breaks off

right there it broke off so now I'm

going to stop the spindle and then zero

this new position in the X so I'm going

to make sure I'm highlighting that

x-axis and then part zero set now just

to compensate for the radius of the tool

make that point one now that you've

compensated for this radius I'm just

gonna zero over that X in this new

position now that you have both your x

and y 0 set you have to set the Z zeros

for every tool you're using in the

program this just tells the Machine

where that tool is just going to start

cutting into the top of your stock so to

0 in the Z direction you're going to

have to change tools to one of the first

tools you're using

so before I let it do an automatic tool

change I always bring the spindle away

from the part to make sure that it has

clearance then I'm going to shut this

door so it can do the tool change now

get into the correct mode and then we're

gonna want to go to tool one so two for

tool one for the first tool to zero a

tool we use this paper test we're just

gonna put this down on top of the stock

bring the tool over and down until it's

right above this paper and then slowly

move the spindle down it's not going to

be moving at this point and move this

paper around until you feel this been

the end mill dragging on that paper and

the stock not so much that you can't

move it but just a little less so you

feel quite a bit of friction make sure

you get in the correct mode to move the

table and spindle around

sometimes with the paper test it's

necessary to use the very smallest

increment

now that I found the top of that stock

I'm going to tell the Machine where that

location is up here in this tool offset

menu spindle is next to number one which

is the tool that we're currently using

and then in this geometry column is

where you're setting your Z zero if this

isn't highlighted with the yellow box

just use the cursor arrows to get over

to that box then press tool offset

measure and that will zero that in this

new location this process used to be

repeated for every tool you're using in

your program a shortcut to switching

just one tool ahead is to be in this

correct mode and then in Tut instead of

typing the next tool ATC forward will

take you one tool in the next direction

and ATC reverse will take you one tool

back

I found that top of the stock now

spindle is next to two because we're in

the second to go ahead and zero that out

now that I have zeroed all the tools

that we're using you're essentially

ready to start running your program so

before it runs I always bring it away

from the stock

now that everything is zeroed you're

going to want to put the program into

the machine your g-code from your master

kim file should be saved on a USB Drive

learn to learn how to make this g-code

reference the master cam tutorial video

insert the thumb drive in the edge of

the machine and then to bring it up I'm

going to use this list program button

here that'll get me into the correct

mode currently I'm in the USB device if

I wasn't and I was over in memory you

would just use your cursor arrows to

come up to the top tab to move back and

forth I'm going to select my file it

should have the dot NC extension not the

dot eerr to bring this file up I'm going

to press select program and that will

grab that file before you run your bit

your file you're gonna want to do a

settings graph of it to make sure

everything looks correct to do that

you're gonna press the Settings graphic

button twice and then the cycle start

green button to step through the file

it's gonna show up on this screen here

all of your tool paths the X's mark

where holes are being drilled

dashed lines are rapid motion and solid

lines are cutting paths if everything

looks correct on your program then

you're ready to start running it to do

that you're gonna press this memory

button here that'll get you in the

correct mode to run the program and then

you're gonna press the green button to

start it you'll press the green button

after it changes tools and waits for you

to confirm and then you're gonna want to

make sure your thumb is ready over this

feed hold button in case for some reason

it does a tool path that doesn't look

correct you could stop it if it's

heading towards the vise you can stop it

if it's going through one of your

mounting screws go ahead and stop it if

you wanted to clear chips off the part

or see what was going on go ahead and

stop this button here that'll just stop

the table and spindle from moving around

the spindle will still be spinning so

won't let you open the door unless you

use stop to stop the spindle it's no big

deal to press this button the green

button will just start it right back up

from where you left off if for some

reason the part gets pulled out of the

vise and too stuck on the spindle you're

gonna want to press the emergency stop

button or for any other situation where

you feel uncomfortable with what's

happening it's not easy or it's not

possible to restart your program in the

middle if you press the emergency stop

so it's better to use feed hold but

always know that that button is there

for you so now it's ready to run the

program so just start green to start it

up

now I'm gonna push the green button

because it changed tools into the first

tour using

here you can see it's stepping through

your g-code also pay attention to your

spindle load here and this will port the

feed rate and the spindle speed to you

rapid motion is set to 50 percent on

this machine max but if you feel

uncomfortable with how fat that's moving

between changes you can step this down

to 25 percent or even to five percent

now that it changed tools its waiting

for me to confirm also this green light

will be blinking I'm just gonna press

the green button now to confirm that

that's the correct tool

now that your part is done you're gonna

want to move it so it's easy to get out

of the machine right now I've moved it

to the center of the machine go ahead

and open the door look in and

double-check that everything looks

correct on your part before you take it

out

if everything looks good go ahead and

grab the compressed air close the door

almost all the way on your arm so you

don't blow debris and do your face or

around the shop go ahead and blow your

part off and take out the machine and

there you have it a completed CNC part