hi Jason what's our bond it's been a
couple weeks since then I'm able to get
a video out for you guys
I've been busy trying to get a Raspberry
Pi for case made out of some billet
we've got fabtech coming up so we're
preparing demos and all the great things
that go with trade shows our engineering
team came to us and they needed a quick
little clamp made there's a few things
that I've always done to make my life
easier one in programming this so I
thought we'd put together a quick little
video for you guys so we could highlight
these points to hopefully help you make
a similar part down the road
be roll the b-roll b-roll de b-roll this
part has way too much stock on it I
described the piece material we had
laying around that this bard fit into so
we had a lot of stock to machine off on
this part not ideal but I used what I
had laying around when I machine apart
like this there's a couple
considerations the first one is you can
see the parts roughing here and I
machine the outside of the part then it
comes back and it machines out that
pocket separately when you try to create
the toolpath to do the whole thing at
one time it has a tendency of machining
the inside features first so you can see
with this tool path now the first thing
that it's going to do is punch the
middle this hole out it's just not ideal
coming from the outside of the part it
helps you manage the chips more
efficiently it's going to be better on
the tooling because you don't get in a
scenario where you can recut chips as
easily and so I just don't like starting
on the center of a part if I don't have
to if you need to cut a pocket by all
means board out but if I have the option
I definitely want to start on the
outside of a part so you can fix this a
couple ways the way I've always kind of
found that just works well for me is I
just turn off machine cavities when I do
this it cuts the whole part but it
ignores those Center pockets in this
hole so it's going to ignore any ID
features or pocket features that are on
that geometry so you can see now we got
a nice tool path that comes from the
outside machines that a nice big adapts
to cut steps up to finish those flats
off so to come back and finish that or
rough out that ID then I just cloned
this tool path
I selected a machining boundary of that
center bore and then turned on my
machine cavities and now when we
generate this path we get a nice clean
tool path that just cleans out this
pocket forest
[Music]
let's look at our finishing operation
this part has a small slot in it this
can pose a few problems when we're
trying to generate a tool path when you
finish the surface like this you just
want to come in make a clean sweep cut
it and be done with it I don't want to
have to manage a gap like this I don't
want to have to do each one of these
arcs as individual tool paths to make it
look nice you can see when I initially
toolpath this if we look at our first
pass and we had generate on this you can
see this tool path does not look ideal
we have a whole lot of segmented little
moves in here that and lots of lead-in
leads out this is this is not a tool
path that you want to run it seemed to
cut the inside okay but the outside
definitely looks pretty bad in in my
experience I've run into a lot of issues
when I have geometry like this where it
just the tool pass and then the cam
systems just struggle so what I do to
help out in this scenario is I'll jump
back into the design side or I'll create
some construction geometry and there's a
couple ways that we can handle this you
know in software like fusion 360 direct
modeling is very easy so I can select
the face in here and I can do a push
poll and I can say let's reinker this
you know let's go from this point to
this point and it automatically just
fills that in for me which you can see
is what we did here the other thing that
I can do is I can just create some
sketch geometry over the top so if we
look at our sketches we can just draw a
sketch here we can project this face
and then we can draw an arc in here so
we can do a Tianjin arc get the surface
projected we can draw Tianjin arc here
and here that closes that outside
geometry we could do the same thing here
on both sides would be a quick way to
get this done
another option is just to create a
circle itself and have it stamped to
that outside inside profile lots of ways
to skin the cat here whatever is quick
and works well for you but this gives us
geometry then when we come back to
manufacturing so if we jump back into
our tool path as you can see when we add
our geometry selected it grabbed
everything but now if we come back and
we turn on our sketch geometry we can
select just the curve and just the
outside flip this back here
and when we select create our geometry
the tool Pat generates really fast and
it's very clean so it's just a little
tip and some experience that I've run
into in life and just ways I've been
able to navigate and fix those things
anytime you see a part it has some
geometry like this it's usually can say
be quite a bit of effort in programming
or just some headaches give you some
more control if you just come in and
create some construction geometry or
tweak the part model geometry to work
for tool pathing one other small change
that i made on this part while was when
it came in to me is this was a
countersunk ole for a metric fastener so
it was that odd size it was like I'm 340
diameter I just punched this out to a
375 little extra clamps in this part
didn't hurt us and allowed me just to
use that same 3/8 end mill to
counterbore these holes without having
to add additional tools to my project so
you can see we're on the OP 2 for this
we just flipped it over put the part
back in the soft jaws that had two nice
flat edges that we were able to locate
and clamp on for the second operation so
we just ducked off the chunking stock we
left from op 1 and we put a quick
chamfer on all the edges
[Music]
good night a lake
no you're just standing
and for the third operation here you can
see we just stood the part up in the
vise milled that flat it came back and
put the chamfer in the spot drill and
then use the two different size drills
we needed one for the clearance and then
the second one was the tap drill for the
long m4 that goes through this so from
here the last thing we need to do is put
the slot in if you recall from the first
operation we did engrave a line for
ourselves as a reference so it's just
run over the bandsaw quick and and cut
the slot in so thanks for watching if
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