How I Use a CNC: Cutting Parts Using a CNC

Precisely cutting a narrow triangle-shaped opening with power and/or hand tools is anything but simple. Cutting parts and precise details are tasks well suited for digital woodworking and CNCs.

Slicing a slender triangle-shaped opening with energy and/or
hand instruments is something however easy. Slicing components with exact
particulars is a job nicely fitted to digital woodworking and

the previous post
, I gave an general rationalization of the
course of that I exploit to make furnishings components with a mix
of assorted energy instruments and hand instruments. Primarily, it’s a
hybrid technique of energy and hand instruments that many different
skilled and hobbyist woodworkers use. The aim is
consistency and accuracy. I mill and sq. up supplies with
jointers, planers and saws. Then, I tough minimize and ultimate form
components to my patterns.

Inventory Preparation

So, how does the method change whenever you use a CNC to chop out
your components? For me not less than, some issues are the identical. I nonetheless
put together my inventory with the identical instruments as earlier than with saws,
jointers and planers. Getting your boards flat and sq. is
much more crucial when utilizing a CNC. You need the boards you’re
going to CNC very flat. From this level on, the whole lot adjustments.

Beneath is an easy instance of the CNC doing what it does nicely:
correct half slicing. On this instance, we’re not slicing out a
full half, only a form in the course of a board. A
lengthy, skinny triangle. So simple as it seems to be, I’ve needed to make
this actual minimize many instances. It’s been troublesome with any
mixture of energy instruments and hand instruments. The crimson triangle in
the drawing beneath reveals you the realm I have to take away.

A Difficult Minimize for Woodworkers

Right here’s the issue: The triangle could be very slender. It’s about
2-1/2” broad on the prime and tapers down over 9” to a pointy
level. It may appear easy however in apply it’s been a
troublesome element to chop out precisely. I’ve tried all of the
woodworking processes that you just’d count on. Probably the most profitable
method has been to drill holes within the corners, then jig noticed
or scroll noticed out the triangle. Thus far, I’ve been sad with
the outcomes. Even holding a jigsaw to a information, the partitions of the
triangle usually are not completely straight and clean. So, after tough
slicing, I arrange a two-step shaping course of with the sample
to get the partitions straight. However, we’re simply getting
began. The sharp finish of the triangle retains it difficult.
Time for rasps, information and plenty of sanding in a
difficult-to-access space earlier than the job is finished. After loads of
time-consuming work, I’ve by no means been fully pleased with the
high quality of the outcomes. This job is all about precision. That
makes it an ideal job for a CNC.

The red area in this CAD drawing is a narrow triangle that I wanted cut out of the board.

The crimson space on this CAD drawing is a slender triangle that I
need to be minimize out of the board.

 First Draw the Half, Then Minimize It

After drawing the board and the triangle in CAD after which
programming the CNC with CAM software program to make the minimize, I
place the board on the mattress of the CNC, align it, clamp it
tightly and start. I minimize my manner down in steps to the total 1”
depth of the board simply as you’d do with a router. Small
connecting items of wooden on the backside of the minimize referred to as
“tabs” or “bridges” are left to maintain the triangle simply barely
hooked up to the principle board. That retains it from rattling round
over the past cross and probably damaging the half.

You’ll be able to see the tabs being machined within the video beneath when the
CNC pauses, rises up after which drops down.  Whole time to
minimize the triangle opening: 116 seconds. The outcomes are good.
Whenever you add within the time for altering boards and clear up,
eight boards had been accomplished in 20 minutes.

Generally a small element is a giant problem. Slicing this
slender triangle out of a board is especially troublesome utilizing
different woodworking strategies. With a CNC it’s executed shortly and

Although this triangle is simply a easy instance, it ought to give
you an concept of how precisely and shortly a CNC router can
machine components. If we had been slicing an entire half with any
mixture of curves or form, there’s a bit extra concerned however
generally, the method is just about the identical.

As I mentioned beforehand, a CNC can do many issues. Definitely, it
does some duties higher than others. And, as all the time, some
duties are higher left at hand or energy instruments. Correct half
slicing simply occurs to be one woodworking job a CNC does
very nicely.

— Tim

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