> > Now I better go take the missus her freshly made morning coffee and see > what she wants for breakfast.
It doesn't matter the country or language, it happens to all of us haha. El dom., 28 abr. 2019 a las 10:38, Gene Heskett (<[email protected]>) escribió: > On Sunday 28 April 2019 05:52:45 andy pugh wrote: > > > On Sun, 28 Apr 2019 at 03:08, Gregg Eshelman via Emc-users > > > > <[email protected]> wrote: > > > I just don't see the point in making the electronics and electrical > > > system more complex when there's no need for it. > > > > I think that the reason is that it can be simpler to route wires to > > two sides of a moving gantry / moving motor setup than to engineer a > > cross-shaft. > > > > If the motor is stationary then cross-shafts make sense. But for the > > common moving-motor designs (and Racks / Servobelt are inherently > > moving-motor) the drive needs to be stepped-up through the gantry or > > down under the table and that can be awkward and increases moving mass > > and potentially introduces backlash. > > My 6040's Y motor is smack on the middle of the bed frames end bulkhead, > with a smallish ball screw driving a large plate of 1/2" alu that rides > two 3/4" or so rods under the bed, with the ends of this plate sticking > out from under the bed, and the gantry risers are bolted to the ends of > this plate. Any racking would be in how this it assembled by the user, > those bolt holes are very precisely sized requiring they be wiggled a > bit to get the alignment for easy bolt insertion,and the motor is > unaware of it. There can of course be something sticking out to catch > the gantry as it goes by, or dull tooling with x way off center x could > flex it, but it does seem sturdy enough for light alu work or pretty > heavy wood carving. The only complaint I've seen on the forums is the x > rods need to be heavier to better restrict the forward/backward tilt the > cutting forces cause on the spindle, they are only 1/2 rods so I'd > agree. I don't have a clue how well it would carve the green and green > finger joints that I have done on the G0704, in 3 depth passes with a > 1/4" end mill to get into a spoil board and jig. I think its wide enough > to do the 1x12"'s that blanket chest uses for side and end boards, but > at 600x390mm its not big enough to do the machineing of the lids which > are 2 ea 1x12's wide with breadboard ends. I doubt its as rigid as the > dual glued down belt and caterpiller tread drive would be, but it seems > to be plenty good enough for wood working and its not subject to swarf > or sawdust as all the drive is under the bed. If your tools are sharp, > both cherry and mahogany can be carved very precisely. And I could see > a dual drive even with the single motor in the center of the cross shaft > as being at least 3x more costly because of the need for a precise bed > for the glued down belting on both sides. This thing is a toy and I > know it, these guides have oilite bushings, something else that lowers > the cost and height. But its doubtfull I'll last long enough to wear it > out, my present plans if they work out, will take me out of the garage, > tuning AM radio towers with a new test tool I've purchased, so I'll be > playing last of a breed and dying radio engineer till whenever. > > Now I better go take the missus her freshly made morning coffee and see > what she wants for breakfast. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
