Furniture maker, Curtis Erpelding testing and tuning the Maslow CNCROUTER
The Maslow CNC ROUTER is
a CNC ROUTER kit that costs just $350. For that price, you should expect a few
compromises. For one thing, you have to put it together. Of course you’ll get
the key mechanical, electrical and electronic parts, however, you will need to
provide plywood and a couple of 2” x 4”s to complete it. The good news, after
using one for a while, I can confirm that it really does work but there is one
more ingredient you need: “Geekiness.”
After reviewing the beta kit, I think
it’s important for potential buyers to approach it with realistic expectations.
First, the Maslow is not a plug-and-play CNC ROUTER —not that any current CNC
ROUTER is, but the Maslow throws in some extra challenges along the way. It’s a
very basic kit mechanically but there are also a few software issues to
overcome. What this means is that if you decide to build a Maslow you need to
be prepared to step in and solve a few problems as they come up.
Because of my schedule, I was unable to
build the kit, so fellow furniture maker Curtis Erpelding got my beta unit up and running.
We’ve found that within reasonable limits, the Maslow CNC ROUTER does indeed do
what it promises. It takes G-code generated from digital drawings and cuts
parts out of plywood or other sheet materials.
Getting the Maslow CNC ROUTER running
Besides building the base — a
straightforward construction task for the average woodworker, getting the
machine tested and ready presents several challenges. Remember, the Maslow is
not “plug and play”. A key task is you need to install the software and
test and tune the Maslow. You need to download the current software,
install the firmware onto the Maslow’s Arduino-based controller and set up your
PC to run the machine. Then you go through several steps to calibrate the
machine.
Along the way, you should be prepared
to debug problems as they come up. And, being a new device and lightly
documented, you should expect a few. This is why I say that potential buyers
need to have some geeky skills. If you thrive on these kinds of modern
challenges, you’ll be better equipped to solve these kinds of problems than a
woodworker who’s experience might be limited to only dealing with mechanical
issues.
Thanks to the support from Maslow
and its helpful online community, you won’t be alone in dealing with most
issues as they come up. Though many of the members of the forum seem to have
little CNC ROUTER or woodworking experience, they do appear to have a lot of
software experience and they are ready to help if needed.
Maslow Ground Control Software works on PCs,
Macs, Linux Machines, some tablets and inexpensive Raspberry Pi computers. The
software is simple and easy to use.
Ground Control Software
The Maslow CNC ROUTER controller
software is called Ground Control. Keeping with the goal of Maslow to make the CNC
ROUTER as accessible and inexpensive as possible, it runs on Windows, Windows
Tablets, Macs or even Linux-based Raspberry Pi computers. From a user
perspective, Ground Control is simple to use and straight forward. You load the
G-code file that you want to run, set a few parameters and away you go.
In its current form, the software is
not quite done but getting closer to completion. As I write this, each week a
new version of Ground Control is released that solves problems that have been
discovered by the many Maslow beta testers. For example, Curtis and I ran into
some issues with how the Maslow was rendering and machining circles and curves.
It was cutting short arcs instead of the smooth curves that we were expecting.
Maslow’s team and the community got on it and fixed the problem. Another issue
was the controller was having difficulties reading other flavors of G-code
files when I provided RhinoCAM generated G-code files for a test. That quickly
got fixed, too. So, you get the idea. If problems come up, between the Maslow
crew and the community, you won’t be alone.
Using the Maslow CNC ROUTER
Once you have set up the Maslow, run a
few tests and are all ready to go, what’s it like to run the Maslow? The first
word that comes to mind — particularly if you have any experience with other CNC
ROUTERs is: slow. You can expect a feed rate of 20-35 inches per minute.
Dragging a router, held down with bricks, using tiny motors, chains and gears
come with some limitations. People have pushed it beyond 35 IPM, but
besides obvious mechanical limitations, a key issue is the Arduino’s processor
ability to keep up with higher speeds. It can only go so fast.
On top of the slow speed, only shallow
cuts should be taken. No, you won’t just plow through a 3/4” piece of plywood
in one pass. Think three or four passes. Between the tiny motors and dependence
on gravity, there simply isn’t enough torque in the equation to do otherwise.
Pushing too hard just adds more resistance. The cost of going too fast or
cutting too deep is less accuracy. So, go with the flow and take shallow cuts –
about 1/8″ to
1/4″
deep.
With shallow cuts, the Maslow is fairly
accurate. The best approach is to keep your cuts as close to the center of the
large Maslow base as possible. In early tests, it was producing samples that
were less than 1/32” off square on smaller cuts. With further tuning of the
controller software, it seems likely the team will get close to the 1/64” or
.4mm design goal. Particularly challenging are long, straight lines. Trying to
run lines as long as six or seven feet sometimes produces a bow up to 1/16”.
But, being measurable, consistent and repeatable, results could be further
improved with more tuning of the controller software on future releases.
A special thank you goes to Curtis Erpelding for all his work building and testing
the beta Maslow CNC ROUTER. His base is a top notch design. Simple, flat,
rigid and cheap. If you’re building a Maslow, study it!
In the final installment of the Maslow
series, I’ll have some suggestions for those considering building a Maslow CNCROUTER.
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