On Thursday 18 July 2019 00:29:50 John Dammeyer wrote: > > IMO the docs for howto are lacking, but think in terms of a velocity > > loop, where position is not the target, but velocity is. PID's can > > handle that nicely but the howto docs aren't as clear as they should > > be. > > > > > https://www.grizzly.com/products/Grizzly-Vertical-Mill/G3616 > > > > Sweet, bigger than anything I have. > > Gene, > From a table size and Z height it's not that much different from the > G0704 I believe. The G3617 had a longer table and maybe a bit more Y > movement but it also had the horizontal boring feature which is why > the table rotates too. For helical gear cutting. Mine does too but > I've never had to turn it in anger so to speak. Just more mass for Y > motor to move. I think with an A axis along with XYZ and LinuxCNC > helical gears don't need the XY axis to be twisted but I may be wrong. > Haven't looked into that.
But the G0704 by the time you have a y screw and motor in it, is a bit short on Y table movement, the y table motion is around 7.5" advertised, but comes down to a hair less than 6 in practice. 22" of X is enough to make it bind at the ends of travel, so way cleanliness and lube is important. Does the head on that rotate to 90 degrees? My G0704 can go a bit more than that, so horizontal boreing can be done, and I have even rigid tapped horizontally. And without the speed control box on the side of the head, I can get a lot closer to the table. Pain in the butt to retram it to vertical since the post itself isn't vertical. I need to wrestle it around to where I can get at the bolts holding the post to the base, loosen them and see if I can square that up, its off just enough left to right to notice it when you've set a drill chuck on the table and are center drilling a tap top hat which is keyed into a 7/8" R8, by lowering the brass slug in the R8 onto the correct size for the tap, drill. There is always the possibility the chuck isn't sitting dead square to the table, but my checking with a dial says the chuck is closer to square than the post is. I then mount the tap with grub screws against its drive flats, and the brass slug has a short 4mm cap screw in its side the fits a notch cut in the R8 which is pinned to the spindle. So the tap can't slip rotationally. Collets simply cannot grip the tap tight enough to prevent their slippage which equals a wrecked hole. Now I can tap even big holes that need to be peck tapped, no place left for it to slip. I made a drawer like thing, filled with 1.25" long pieces of white plastic fencing squares. Made out of scrap wood, its ugly, but now I have most of my taps in one place. And protected from knocking the edges of the flutes. Used about 8 feet of 7/8" brass rod to make the top hats. Room for 100 such taps in hats, has around 60 in it now. And beginning to get too heavy for the old man's back. :( > Creating a powered horizontal shaft that hangs from the upper ways > isn't a big deal so I could still add the horizontal boring feature. > > But the machine does have a lot more mass than the smaller ones. Yup, this G0704 is only 400 lbs. As far as making helical gears, if the proper shape of tooling cutters was available, my rotary table can and has supplied the helical to make one time use or maybe twice, custom wood drill bits. > John > > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
