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Discussion in 'CNC Mills/Routers' started by Florian Bauereisen, Feb 25, 2015.
beeing honest, i have always liked the design idea of the ox, but not its flimsy apearance...
So i set out to design a machine using 120x40mm (x) and 80x80 mm (Y) extrusions, incorporating linear rails ( 20 siced) for accurat, smooth movement .
Bell Evermann`s "belt on belt design" including a gearing down by aprox 3:1 for beeing able to have some uumph in the now rigrid machine. More accuracy comes with it for free .
Ballsrew 12x4 mm on z for aprox 10 cm net. so 2,5d should be possible within reason. (model-fuses/ moulds for ex.)
The router is not fully designed through yet, as i have since choosen to go a different route, a build that i will publish once i have finished it.
Mainly the z-axis needs some more attention, especially the upper bearing ( fixed bearing) of the ballscrew.
This will specifically work only with components of "romani" linear bearings and a ballscrew of "eichenberger" make,- so there is no point to publish all plates and meassurements.
Feel free to use the design principle for your own personal machine - but not comercially (forum owners- how do i go about this?)
will upload some more pics soon.
feel free to ask if you have trouble to understand a detail
x- axis - bearings and Omega drive
x- axis viewd from outside showing the gearing
y- axis the light green "inlays" are used as tensioners for the pully
x,y,z viewed from underneath
viewed from top
Doesn`t look that way but in the end it is quite compact having aprox 65% milling area ( of all area used up)
I look forward to reading more details!
Well it has been designed with some modularity in mind, easy to build and easy to change over.
most important is that nearly all important/ critucal drilling is done to the flat aluminum sheet, only very few need to be aligned with the side face of another piece ( the two screws seen on the "t" connecting the Nema/gearing holder are not really neccesary- only for the heavy duty friends).
of course all parts could be made square, but as i have a cnc - why not make them look nice?
-using Nema 23 (75mm/3Nm) all round
-lenth and width to vary (easy) , even z could be made to different specs within reason.
z could be adjusted by
- using differnet hight x axis extrusion or
-build a thicker/thinner "T" bracked (connecting the linear wagons with the y axis)
-atm it is for my bought z-ballscrew but i have a semi finished belt-z-Axis too
Z should be using a single 25 sized linar rail with a long wagon, not only for space reasons but in order to mill aluminum propperly,
all others size 20 should prove plenty. ( all of the square type)
The ballrace shown to tighten the gearing belt is simply for beeing lax while drawing, in reality it should be one of these excentric belt tensioners availible online.
Both belts on x beeing tightened by oval holes in their plates ( not shown in cad ) connecting them to the extrusion. In case of the y- axis this is done through these little plates ( green ) with oval cutouts beeing screwed to the vertical plates.
In case someone doesn`t have a cnc to produce the cutouts for them, one would simply have to vary with the space needet a little.
Instead of meticoulosly designing the interlocking of the belts by the 1/100 and thus beeing stuck on a particular ballrace/belts... i went another way.
The lower belt simply gets attached to a l-shaped alum.bracked which in its turn is adjusted in hight by - you guessed it - oval holes to the extrusion.
for a simple router one could simply screw the x axis extrusions to ones building board/table using L- brackets, while others might build the complete frame.
buy enough belt first time and dont cut it - in case of changes you won`t need to buy again...
You can't truly protect any designs or design ideas you post on any forums as they become part of the public domain. Although you may request something not to be used commercially it is just a request and may not be heeded by an unscrupulous manufacturer.
Certain types of CC (and other) licensing afford a degree of (voluntary) protection but when 'push comes to shove' you may need copious disposable wealth in order to enforce it (a bit like trying to enforce a patent which has been 'ripped-off' by a far-eastern manufacturer who is perhaps 'here today and gone tomorrow').
btw. Excellent work with that beefed-up and heavy duty design, it is truly inspirational.
thanks for clarifying...
of course i am aware of the situation in general, but actually i was in search of these CC and other licensing you mentioned... and beeing honest i could not find them.- Or even an explanation of the licensing types. I only about them because i have stumbled onto within the detail part of other builds...
Could you point me the direction where to find them?
All i wanted to make clear is the fact that i like to share with the comunity my design but would be a bit dissapointed if somebody would make a living of my work, while leaving me with nothing.
And some more info here https://creativecommons.org/licenses/
Thanks for your input.
So i would have had to publish this as a build in order to atribute a licence? Right?
If so i would have choosen CC BY-NC i guess
anyway too late now...