Building my "OOZNEST 1000mm x 750mm WORKBEE" cnc
Welcome to this lengthy and hopefully informative thread on how I (with a little help from Openbuilds forum members) went about building this great cnc machine.
Garage Cleared.... and I'm about to embark on my journey down this Desktop CNC path. Join me (a total CNC Greenhorne) as I stumble and muddle my way through this quagmire of mechanical mayhem and sobering software hurdles......
Today (as I wait for my second parcel to arrive due to Parcelforce UK delivering one and not the other, even though they were both collected from source and at the same time) I have made something resembling a "bench" on which to site my Workbee. Not having a huge amount of room to play with, a completely new wooden structure was out of the question so I fashioned a new table top and mounted it on a pre-existing workbench, all leveled and attached with sturdy brackets. I then rigged up a light source and the basis for cable and vacuum pipe management. Attached to the front I've included a double electrical socket for the lighting and the dust extractor, I wish to add an emergency stop button as we progress.
I cant wait to get started building this machine..hopefully it will be a smooth ride. How many of these blinkin wheels are there lol.
My bench and the Ooznest delivery
UNBOXING - Setting the beast free.
Ok..Lets get to it...
From the outside the boxes seem good and strong, fit for purpose and nicely bound with sturdy bonded tape, followed up with secondary Ooznest branded packaging tape. A nice touch in my book.
Upon opening the slimmer, elongated parcel first (1200mm x 210mm x 230mm) we have the majority of the rails and screw-threads apart from the smaller Z axis C-Beam and threaded screw (see image below) Each part is easily identifiable via well laid out labeling stickers, for a novice like me this is a treat.
The rails and mechanical build kit
The second, 480mm square box was jammed to the rafters with all the other nuts and bolts to get this baby animated, Wheels, Drag Chains, Electrical and Software, it's all in there awaiting some bright spark with a screwdriver to bring it all to life (well at-least I have a screwdriver)
The Nerve Centre in a box
Pt1 - MECHANICAL BUILD PROCESS - Somebody pass the spanner..
Wheels (allow 11/2 - 2hrs) The first task that I needed to perform according to this extremely well presented manual was the wheel construction, all 48 of them....... this was a pretty laborious and time consuming process as each of the wheels and their parts were individually packaged in small Griploc bags. Almost 2 hrs later and with a substantial pile of Griploc bags, we're all done
Constructing the wheels
Plate Assembly (allow 11/2 - 2hrs) This evening I thought I'd give the Plate Assemblies my upmost attention, everything went according to plan, with me rigidly adhering to both manual and video for guidance...The only thing I hadn't bargained for... or could ever know...being a newbie to building these machines... was "How Tight is too Tight" I've got all my wheels running on a length of "C-Beam" individually tightening the centric spacers as I went along (all the wheels are touching and rolling) but they seemed a little stiff. Will they be ok, not sure said the demons in my head ....Likewise with the Lead Screw passing through the nut blocks (again this seemed fairly stiff to manually turn) should I loosen this off.... again....I'm not sure...At this point I requested help from the forum members (I dont want to get this wrong). Waiting on replies to my plight before progressing onto the next stage...Great satisfaction to see some wheels attached though
Plate Assembly started, but already we need some help...
This evening finds me attaching one of the NEMA 23 Stepper Motors to the Left "Y" Plate assembly which I completed yesterday. After which I proceeded to make-up the Right "Y" Plate assembly, everything went pretty much according to plan with no hiccups, again the Ooznest Manual coupled with the the Online Videos helped tremendously.
Stepper Motor and Right "Y" Plate Assembly
After a short while I now have two "Y" axis plates running freely on "C" Beam profiles. If I'm honest its been a pretty productive evening, taking my time...Yeah...ROME wasn't built in a day
Left and Right "Y" axis plates
Enough of me standing about admiring what I'd achieved thus far, there is lots more to be done, Quickly moving on to the "X" carriage assembly which again was pretty straightforward, To finish off this evenings proceedings I attached the Anti Backlash Nut to the above plate...So if some kind soul would like to explain the finer points of Backlash (and how it relates to everything) in plain speak then feel free to educate me in my thread.
"X" Carriage Assembly including the Anti Backlash Nut
I've been contemplating whilst still focusing on building this CNC kit, and a thought did enter my mind on the topic of aesthetics.
When I purchased my Workbee from Ooznest I opted for the Black coloured Anodised extrusion for all the rails, plates and hardware etc. There are no decals of any sort on the plates as I have seen on the Openbuilds - Stateside version (see image below)
Openbuilds "Workbee" Plates
It's just a small point and I know its not about what the machine looks like that counts more of rather what its capabilities are in the workshop. Perhaps they are not to everyone's taste but I happen to consider this a nice aesthetically pleasing touch especially for the black version and quite possibly would help the novice with quick glance plate orientation, not to mention good advertising for an onlooker. maybe something for Ooznest to consider for the future. Anyway I for one would love a set of snazzy retro fix stickers for mine at some point . So if anyone out there is listening
Working my way through a few more pages of the manual this evening and the last of the "X" Plate assembly before working on the gantry's..I can only describe the going as "slow & fiddly", it could have been a lot easier if my Hex Key set wasn't festooned with colour coded sleeves which negated access to tightening up the front of the "X" Plate to the rear...anyway with a few improvisations I eventually got the job done.
Various stages of the extensive "X" Plate Assembly
That done, I once again adjusted the eccentric spacers so as all the wheels turned equally along a length of "C" Beam with little force. Next I attached a 250 mm length of "C" Beam to the "X" Plate Assembly and proceeded to screw on the End Mount Motor and the End Mount Bottom Plates to this...I have to confess, at this point, I did make the mistake of putting these on upside down (DOH!)...I should have known really as only one side has recessed holes for the screws to seat in...anyway you live and learn....Once I had these plates correctly orientated I mounted a NEMA 23 Stepper Motor to its designated position at the top of this short profile.
Stepper Motor attached to "Z" Extrusion
Tomorrow I hope to fit the "Z" Acme Screw to its Axis and tidy up the stepper motor assembly, then get cracking on the actual gantry construction. It's looking good thus far..
Well I knew I was going to have a "Bad Day" sooner or later and I never want to see another "Z" Limit Switch in my life again...ever.
This has got to be the bane of Workbee builds the world over, Its a necessary item granted but its so bloody inaccessible if you don't fit it at this particular point in the build...I didn't, and like a great number of builders before me paid the price of having to back track, disassemble a few things and then screw the darn thing into position. not to mention bending a few wires so that an extrusion could safely pass over the top of it....then removing a connector so that I could route the wire properly to the outside of the machine...Not a great day, and it would have been a whole lot worse if @Alex Chambers wasn't about to keep me right.
So for the poor folks that come after me and like me got into a muddle here are some images of how this was all corrected.
This is where the little switch resides you see the two little holes at the bottom of the assembly (yes right in there)
Here are the parts, (they can give you a headache so please read the manual carefully and dont over tighten those little bolts.
And when you have completed the job you should end up with something like this...
But the problem now will be how to route the wire through the little hole to the outside of the plate opposite when there is a large white connector block attached...Well it's gonna have to come off I'm afraid...again @Alex Chambers advice proved invaluable so I'll use his very quote here...
I felt all of the above needed to be included as to perhaps help others escape the predicament I found myself in this evening,
Apart from this slight glitch in proceedings, everything else went according to plan
Don't forget your PTFE Silicone lubrication for those lead screws
The BEE and ME
I have always wanted to work with CNC machinery...a few years back I got my chance to learn some basics at the Double Glazing Company where I was employed (very basic I might add) before the firm folded and I was made redundant...I wanted to continue learning and when I came across this site which push affordable machines I thought I'd give it a go. So I purchased a !000mmx750mm Screw Driven Workbee from Ooznest and I'm about to embark on my quest as many have done before me...Wish me Luck!
- Build License:
- CC - Attribution - CC BY