On Friday 22 July 2016 06:25:36 TJoseph Powderly wrote: > Hi Gene > some reports on ATS-667 > " What I found is that the polarity of the output is not the same when > the unit is powered with a tooth in sensing range as it is when a > tooth is not there! " > > http://www.msextra.com/forums/viewtopic.php?f=131&t=45528 > > and suggests a similar product from Honeywell > http://sensing.honeywell.com/1gt101dc-hall-effect-gear-tooth-sensor-88 >720-sep91-install.pdf > > or this one from taiwan > http://www.chiarey.com/products-en.html > look for Guboa HiSpeed sensors > > just fyi > tomp > > On 07/22/16 11:43, Gene Heskett wrote: > > On Thursday 21 July 2016 23:54:31 Gene Heskett wrote: > >> Greetings all; > >> > >> Just for S&G I stopped at the place that still has that old Porter > >> lathe he wanted $500 for a couple years ago. About a 16"er, 6 foot > >> or more bed, but no motor. It would have been at least a year at > >> my pace to bring it back to life. > >> > >> But that wasn't the surprise. That was in the form of an old air > >> compressor he had taken as junk from the local horsepistol in a > >> remodel/upgrade of some sort. One big horizontal tank, with two > >> overhead pads on it, each of which held a single cylinder, 1 hp > >> compressor, and each had its own 1HP 3 phase 230 volt Dayton motor > >> that spun very freely and had no endplay, so since the bearing > >> numbers were on the label, I have to assume ball bearing. I offered > >> him 50 bucks for both of them. > >> > >> Next thing I knew, he was dragging out the cutting torch because > >> the bolts were rusted and hard to get to, so both are sitting on my > >> garage floor right now. > >> > >> I have company, 2 of my boys will be in Sunday thru Tuesday this > >> next week, so we'll have to make a trip, maybe two, to the rifle > >> range, but if I can find a round tuit before then, I'll have both > >> of them clipleaded to that 1.5 HP rated inverter & see how they > >> like running a bit faster than 60 hz for 1750 revs. > >> > >> In other words, I found a motor, and with luck a spare that I can > >> run with linuxcnc for rigid tapping and such on this Sheldon. One > >> more problem solved, although I may have to build a lock pin of > >> some sort to keep from unscrewing the chuck with a quick reverse. > >> And now I need to find where to put an encoder on it. More shade > >> tree engineering I think. > >> > >> So things are looking up at a bit better angle. ;-) > >> > >> Cheers, Gene Heskett > > > > I just went out and stared at it for a couple minutes, and something > > along the lines of Jon's Bridgeport and the hall effect sensors Jon > > Elson used looks doable. But with this motor potentially having the > > ability to do 8k rpms with this inverter, and the big gear on the > > spindle right behind the front bearing looks like a good candidate, > > but this motor has the ability to turn the spindle well above the > > 1300 it can do now (faster than I'd be comfy standing in line with > > it) and thats about 10EE20 teeth a minute gong by a hall when its > > throwing lube oil 20 feet. So my question is, since that gear must > > have at least 100 teeth, are the halls that fast? > > > > I just pulled the allegro ATS-667 datasheet to see if I can get any > > schmardter. Looking at that, 10u-s on delay, sub-microsecond off > > delay, So it should to twenty kilohertz. So it should work up to > > anything I'd be comfy around. I'll have to eyeball some more for an > > index trigger though. > > > > Cheers, Gene Heskett > I just read thru the 627 datasheet. The only problem I see is that its power up state is a logic one even if sitting on a tooth. So, potential timeing error at powerup is one tooth. As I see it, lcnc will use the index pulse and by the time 2 of those have been detected, any initial errors will have been corrected. So I believe that will work to the basic accuracy of the teeth as long as it gets the original index pulse's sorted. I can't imagine a working scenario where one would want to do spindle stopped work without its getting a few revs to get everything sorted. And with the large number of teeth to sense, sub degree accuracy would appear to be within reach.
AS soon as I know these motors are good, I'll order a 10 pack of the 627's. And start designing a mounting for them. I think thats next, play with motors. But there are heavy for me & my bad back. > ---------------------------------------------------------------------- >-------- What NetFlow Analyzer can do for you? Monitors network > bandwidth and traffic patterns at an interface-level. Reveals which > users, apps, and protocols are consuming the most bandwidth. Provides > multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make > informed decisions using capacity planning > reports.http://sdm.link/zohodev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports.http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
