The parts sold as the kit are just the motion control portion. The support structure is part of the flexibility that is up to the end user. A sturdy base that doesn't grow and shrink with humidity is needed, but you don't need to weld and you don't need a 6' X 10' granite surface plate. Most people will build a machine base (perhaps incorporating machine guarding and dust collection enclosure) from 80/20 or Misumi aluminum extrusion. Design it to be rigid and to resist torsional flexing. It doesn't need to be optically flat. Many people will build it using precut pieces (Misumi is particularly good for accurate and repeatable pre-cut lengths) so it should be square when assembled, but your floor won't be level so use machine base feet to level the machine. Null the spindle runout with shims, and then have the router itself machine a spoil board so the top surface is flat relative to the spindle. If you're not using a spoil board, another trick is to put legs with machine base levelers every two feet and use a dial indicator to level the top of the bed to the spindle. It's not quite as tedious as it sounds, and the commercial CNC routers aren't infinitely rigid either so they'll need the same sort of leveling tricks.
On 04/21/2015 08:15 AM, Erik Friesen wrote: > Perhaps my sights are set too high here, but I have looked at this - > http://www.ebay.com/itm/261855407885 - as well, but it looks a bit flimsy > on the X axis to me. Also, how ever do you get the thing from twisting? > > I find it hard to understand how you weld up your own frame and get it flat > and square, unless you have the right tools to do so. > > I cut a lot of 12"x12" material into little pieces, so flatness and > rigidity is quite important to me. I want to stick a piece of material on > the bed and be able to have the part heights come out within 3 thousanths > or so, assuming the material has a flat bottom. > ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
