CNC 3018-Pro: Assembly Tweaks

If you regard your new CNC 3018-Pro Router kit as a box of parts which could, with some adjustments and additional parts, become a small CNC router, you’re on the right track.

In my case, the aluminum extrusions arrived somewhat squashed inside their well-padded foam shipping carton, which leads me to believe the factory responsible for tapping the bolt holes in the ends must be a fairly nasty place. In any event, the hammerhead T-nuts for the gantry struts simply didn’t fit into some sections of the slots, although they worked fine elsewhere.

So, file a smidge off the rounded sides of a few nuts:

3018CNC - 2020 T-nuts - filed
3018CNC – 2020 T-nuts – filed

Which let them slide into place and rotate properly despite the bent channel:

3018CNC - 2020 T-nuts - trial fit
3018CNC – 2020 T-nuts – trial fit

The assembly instructions used a word I’d never encountered before:

3018CNC - Gantry plate position
3018CNC – Gantry plate position

Turns out ubiety is exactly correct, but … raise your hand if you’ve ever heard it in polite conversation. Thought so.

I’ve not noticed any harm from rounding off the position to 46 mm; just position both struts the same distance from the rear crossbar and it’s all good.

The struts behind the CAMTool CNC-V3.3 electronics board were also squashed, prompting a bit more filing:

3018CNC - CAMTool v3.3 board - trial fit
3018CNC – CAMTool v3.3 board – trial fit

The CAMTool board is basically an Arduino-class microcontroller preloaded with GRBL 1.1f and surrounded with spindle / stepper driver circuits.

As with the MPCNC, I’ll dribble G-Code into it from a Raspberry Pi. Alas, the struts behind the CAMTool board are on 75 mm centers, but the Pi cases on hand have feet on 72-ish mm centers. Pay no attention to the surroundings, just drill the holes in the right spots:

3018CNC - RPi case - drilling
3018CNC – RPi case – drilling

Add more T-nuts and short button head screws, with rubber pads between the case and the struts:

3018CNC - RPi case - mounted
3018CNC – RPi case – mounted

It’s coming together!

, ,

  1. #1 by madbodger on 2019-08-12 - 08:43

    I thought of my K40 laser engraver as a box of parts instead of expecting a turnkey working unit, which was the right approach with that unit as well. I also picked up a new vocabulary word (no, I’d never come across “ubiety” before either) from some strangely translated instructions, in this case an ultraviolet LED-based “counterfeit detection pen”, which would let me determine if currency was “stumer”, which also turns out to be a correct usage.

    • #2 by Ed on 2019-08-12 - 18:34

      Does a 40 W CO₂ laser have sufficient grunt to cut 1/8 inch = 4 mm acrylic at a reasonable pace? I’d expect it to “engrave” a surface pattern well enough, but don’t have a good grasp of the power-vs-cutting-vs-speed tradeoff.

  2. #3 by Keith Neufeld on 2019-08-12 - 10:07

    Is this your first post about this kit, or did I overlook some that I should go back and read?

    How did you pick this particular model out of the different variants available? I’ve been wanting a desktop CNC mill and wasn’t aware that this was a thing yet; so I’m ready to place my order immediately and, from what I see, would make the same model selection that you did. But I’m interested to hear your thoughts.

    • #4 by Ed on 2019-08-12 - 18:51

      This is new news; it arrived a while ago and I’ve finally gotten things kinda-sorta working. More writeups to come.

      I intend to use it for engraving and maybe drag cutting, rather than even light-duty milling. Although it’s less bendy than the MPCNC, I’m sure there’s a reason the demo picture shows it milling a pink foam block. There’s no spindle speed control and no provision for a chuck, so it’s no good for drilling.

      The package seems to be generically available from a bunch of low-end sellers; I picked Sainsmart / Genmitsu (“sold by Sainsmart Official”) because they seem reasonably sold. The fact that a mysterious $40 “coupon” appeared along with it clinched the deal, although I’m pretty sure I was the subject of an A/B test sequence. Got a pack of needle-nose D-bits I’ll likely never use, too.

      • #5 by Keith Neufeld on 2019-08-19 - 07:15

        Will you be circling back to making some cuts with this? I’m on the edge of my seat to hear whether it’s a low-capacity tool or just a toy!

        • #6 by Ed on 2019-08-19 - 08:20

          If all goes well, I’ll use it as a drag engraver, not a router: no cutting. It has just enough work area to cover a CD, which is about all I need at the moment.

          IMO, it’s little more than a toy: more rigid than the much larger MPCNC, less rigid than the Sherline. The spindle motor is an open-frame DC motor with a nice fan pulling air through the commutator, so you should expect a brief lifetime when exposed to even non-metallic swarf.

          • #7 by Keith Neufeld on 2019-08-19 - 10:21

            This sounds like not a good choice for milling prototype PCBs — one of the product photos — which is my primary interest. Would you concur or do you think it would drag okay for that?

            I would inevitably attach a vacuum to pull away the nasties.

            • #8 by Ed on 2019-08-19 - 13:55

              I think it could be made to work for that, with some effort & attention to detail.

              The extruded aluminum platform isn’t a plane surface, so you’ll need auto-zero probe/adjust to compensate. I’m using a spring-loaded diamond drag tool, where ±0.2 mm isn’t a dealbreaker, but an end mill wouldn’t be nearly so forgiving.

              Put it in a box with a vac hose on the rear wall, rather than try to attach the nozzle to the table or (worse) the XZ carriage. Maybe a really skinny hose would work on XZ, at the cost of lower flow and worse vac motor cooling.

              I’m getting all compulsive with the motor current waveforms; the 24 V supply may be too much voltage, rather than the MPCNC’s too little 12 V supply.

  1. CNC 3018-Pro: CAMTool Modification for MBI-style Home Switches | The Smell of Molten Projects in the Morning
  2. CNC 3018-Pro: GRBL Configuration | The Smell of Molten Projects in the Morning