On Friday 31 July 2015 08:37:59 andy pugh wrote: > On 31 July 2015 at 12:33, Gene Heskett <[email protected]> wrote: > > Or am I missing an important concept in the shape of the worms > > thread? > > No, in fact the thread angle of Acme is even perfectly correct for a > 14.5 degree PA worm.
Well, I've not measured it, not having that sort of gauges, but it sure looked like an acme to me. Of course the only one I've had apart in the last 50 years is the 4" grizzly, made in India. The bull gear is eccentric so it has variable backlash, it has no center, so while I use it, its less than a stellar performer. I even dumped some chalk in the works and ran it about 10k revs & back while it was adjusted to drag pretty heavy on the high spots. I cannot see that it made any difference at all. It can at least hold a tool at a usable angle for sharpening it. I guess thats what you call using what you brung... I an going to need a decent 6" with this new mill, but haven't stumbled over one on fleabay yet. Something that isn't too hard to motorize. I have it homing the first 3 axis's just now but need to find some cable clips and "nail" down some of the cable I ran today. I also thought I'd found a bug, maybe because if you have a HOME position that is not where the switch is, and you don't have a HOME_FINAL_VEL setting in the .ini files, it tries run about 500 mph, to the final parking position and trips off halfway there with a joint # following error long before it hits high gear. I know, read the darned integrators manual. Get the cable nailed down & out of the way, rip that box of junk off the left side of the head and feed the spindle motor from Jons servo amp, and I should be getting close to a usable machine. Been at those home switches since about 7, and my back is demanding a break. I've not made the X switches "roof" yet either. But it's progress. I think, I've not turned the spindle with Jon's servo yet, gotta figure out a power on delay to stage the psu/driver box. Turning it all one with one switch trips the 20 amp breaker I put in just to run that 4-plex behind the machine. Picky stuff, but show stoppers regardless. There are 2 300 watt axis motor supplies in that box, and a 115 volt DC supply for the spindle motor, and theres 20 each 6800 u-f caps in it, 5 per supply, and 4 supplies rigged series & parallel to get 120 volts at 12-15 amps delivered to the motor if its working hard. Its a good inrush for the first cycle or so & a cheap 20 amp SQ-D see's it and says, no, I don't think so. Instantly. So, I am headed to town to see what I can do about that. Might come back with a 30 amp breaker. Or a 25 if I can find one thats a bit more tolerant of 1 cycle 100 amp inrushes. 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
