Greetings; I just did some playing, tapping air with a 4mmx.7 tap, to see just how fast I could run it without errors as I raised the spindle revs.
With some diddling of accels amd such, I just tapped a hole 175mm deep, at 1mm pecks with a 2 second pause at the top to allow the tap to be blown clean and annointed with a drop of buttercutt, or whatever you fav tap lube might be, at 1300 rpm. That puts my Z axis at about 80% of its top speed with that fine a tap, .7mm pitch, which I think is amazing all by itself. The G0704 seriously needs an air or gas spring counterweight scheme in order to equalize its max up speed with its max down speed as its about a 2/1 diff since the screw has to lift the 30+ lb head. So if to match the xy speeds, that nema 34 needs to grow some real nema 34 torque and that likely will need a higher voltage supply (60 now) to get speeds like the XY have now. This motor crawls at its top speed, might be turning 400 rpms, and fleabay can supply a stronger motor, but where can i source a psu that would turn it at 1000 rpms under load? Those for steppers seem to top out at 60 volts, but that qould probably need at least 100 volts at 7 to 10 amps to get real speed, say 75 IPM out of it. So with the current Z drive, 4-5 hundred revs is about the limit on bigger taps. I ran a 10mm tap at 200, ditto a 7/16 USS and that worked, but even though I had the backgears in the head in low, it put a serious strain on that 1HP motor. I thought I had my overtravel tally working like it does on the lathe, but its acting as if it has no input, so I need to go play with that .hal file again as apparently I did not copy/paste /all/ the lathes stuff into it yet. At 1300 revs, I am guessing the overtravel is close to two full turns. With that huge 5" 4 jaw on the lathe for mass that has to be turned around, its over 3.5 full turns at 300 revs, a huge difference. My back is screaming, worked too hard trying to put our basement back together far enough to be able to do some laundry, but didn't get it done as I thought this might be a good time to fix the burned off connection to one of the heater coils in the pan on the rear of the drum. But before I pull the drum, I'll drop the card for a new one as this one is 35 yo or more. It doesn't owe me a thing. Neither does the top loading, never quite rinses all the soap out even with a 2nd cycle with just water, Maytag of similar vintage so 2 new machines may be on a truck by Tuesday latest. I am looking at the pricy SamSung offerings as being a cut above the rest, anybody else have any other good recommendations? 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> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
