I am looking to do some traveling in the near future, and would like to bring the Maslow along. In its normal state that is just too much wood and weight. My initial pencil and ruler drawing was based on using PVC and looked like this using 2 inch PVC, single Y joints, 4 way joints, 90 degree elbows, and 45 degree elbows.
I figured a 2x4 bolted to the PVC to hold the work piece on the bottom. I have not figured out how the motors would attach. My current assumptions are that the frame will lean against a wall, with the option of fastening it to said wall for stability.
My main requirement would be as light as possible, and able to easily break down into a package that can be stored, also it would be nice if the materials were safe to be outside during nice weather.
I’m hoping for some ideas, PVC is not my end all material, it just seemed like a mostly sturdy material that might satisfy my requirements.
I think that a downward pull on a motor would bow the topmost rail up in the center. Not sure how to address that with off-the-shelf fittings, though.
A rigid frame is important for accuracy. My experiences with PVC leave me doubtful. Perhaps some tension cables to ad rigidity? Unistrut is certainly heavier, but much more rigid. There are some aluminum extrusions that might work.
and have the top bar collapse down to a shorter length for transport.
With the solid top rail design, it’s the only thing that must be especially
ridgid. Everything else is just to hole the top bar in place and hole the
workpiece in place.
you will probably have a little error in the motor spacing with this type of
tube, but if you either calibrate the motor spacing each time, or hook the chain
over both motors and have them pull against each other while you tighten the
bolts, you should be able to get pretty consistant results.
That looks like a section of antenna tower. You might be able to find some at any good sized ham radio swap, maybe a flea market, or in my collection of spare tower parts. An old TV tower could work, in rural areas digital TV has pretty much eliminated OTA TV and unused towers are rusting away unused
I’m pretty sure it’d be easy to make a unistrut design that looks somewhere between this one and the unistrut design (essentially a copy of the wood frame) using the ‘special accessories’ available for unistrut at mcmaster.com or a similar speciality supplier, (vs. the minimal unistrut accessories available at the standard home center) and boil the whole thing down to something that’ll fit in a duffel bag or golf bag or similar conveyance (like a Drum Kit hardware bag/box or Hockey equipment bag?).
It’ll still weigh a ton (+/- 80lbs), but a frame could be made to fit in that much space, disassembled.
O ok, i tought that most calibration issues where due to bending of the top beam.
And when portable then you have a top beam made of 3 or for pieces, hen you need some kind of construction that can handle these things.
What i can’t find the thread where there was talk about 30kg forces bending the top beam and causing the calibration to be off.
I’ll try to hunt it down and paste the link here once i find it.
Don’t reinvent the wheel here though, if you want light and portable there are extruded aluminum “systems” that are common for trade shows (light, strong) and used in CAM systems with more traditional XYZ CNC machines. Also, supposedly you can build a system for smaller sheets, so 4ftx4ft or 2x6ft if you mostly cut signs for example.
I really am hoping someone can share how they are building legs & the 12 degree tilt with unistrut though. I would prefer to “stand on the shoulders of others!” But I will document my attempts if no one has a good design or idea to share. Also, am I over killing to use that largest unistrut?
These links are Just for ideas, I am building in steel for a Rigid, slightly movable CNC setup. While I love the basic low low entry price of the Maslow, it would be amazing to see options (or a market place) for sleds, frames, etc… to avoid everyone reinventing everything.
I have already shared my SVG laser file for a sled (i have cut my test sled, but haven’t tried it) and will share my electronic case plans once I build a Case. So, things that would be nice to have from Maslow or in a Maslow market place
Maybe a full frame kit with wheels and 4x8 sheet storage
A kit with all the hardware except the unistrut (to source locally to save on shipping)
Wheel kit for moving
Electronics case(s) (although a possible design to move everything to the sled is a great goal, and makes the case and sled as a product option even better)
Sled, once a best design is sort of agreed on.
Not sure if I missed anything or if I am helping here.