Hi everyone my name is Tom Damico I'm adjunct faculty for Sinclair
Community College and this morning we're gonna make a part.
We call it widget which is something that's non functional it doesn't go on
anything or do anything, but it does take you through all the machining practices.
So we'll go step by step we have a process sheet which leads you
through it so if you're not really familiar with the machining aspect of it,
this will help you out considerably. The first thing we're going to do is what we
call layout. Also everything that you see on this table here are the tools that
we're going to use and then we're going to show you how to use them as we move
on. Just quickly I'm gonna run through some of the tools here that we're going
to use these are micrometers; these are dial calipers; okay, these are
all the cutting tools that we're going to use; drills, reamers, more twist drills,
spotting drill (center drill it's also called), counter bore tap, and countersink.
You'll get a better picture of them when we start running the machines. So the
very first thing we're going to do - we're going to do the layout work. Now these
are adjustable squares here and this is a scriber. What we make our lines. The
only difference between this and a pencil is this makes the marks on steel.
Okay, so these are adjustable they start out at 0 and they go up to 1 inch. Now
these particular squares are all graduated in 1/16, 1/32 and 1/64 inch.
I like to use these because the 1/16 is what the dimensions are on
most of our prints. Also when you look at this print, not sure how good of a picture you
have here, but the very first thing you want to do is number these holes 1 2 3 4
5 because that's what your process sheet. It'll say hole number 1, 2,
3, 4 or 5, so that'll help you out. But anyhow all you do is loosen
this right here and and you can move it to the lines that you want. Okay,
there's our overall length three and a quarter and if you look at your prints
it'll say three and a quarter. Okay, so also our dimensions are taken from this
printed edge here. The other side is not painted and that tells you that we will
be working from that painted edge which is always on your left. Okay, so that we
can't work from both ends and mess up your dimensions, so we're going to start
out first of all looking at our print. We've got a line that is
three-quarters of an inch so I'm going to set this at three-quarters of an inch
and I'm going to lay this on there, put this against the edge like so, and we're
going to make a line on there. You put a little bit of pressure on there like so.
And we have our first line on there now. We're moving to hole number 2. We're
going to put our line on there again.
Okay, and then we're going to move to hole number 3 which is two and a
half inches and then we're going to move down to hole number 4 which is
on the same center line and then over to hole number 5. Okay, then we're going
to put a line for our overall length which is three and a quarter. And there's
very little material on there so we'll have to be careful when we machine that.
So we'd be checking for size before we start machining on it. Okay, so now if you
look at the top view of it remember we're working from the left side the
painted edge here where you see all the crosshairs. That's exactly where your
holes are going to go.