On Wednesday, May 30, 2012 07:15:28 AM John Thornton did opine: > I don't have a pole can... I live out in the woods and all the services > are underground and I'm serviced with a pad mounted transformer that > only feeds my house and shop. I have a 200 amp service that is split > between my house and the shop and both have 200 amp panels with proper > size wire. I can spin up my lathe 5.5Kw spindle from 0-6,000 while the > mill is running and never have I seen the lights dim, well when I ran > the garage from some direct bury 10ga I could make the lights dim but > not since I built the shop and installed proper wiring.
Sounds good. It also means the power folks can access the can for tap changes a lot easier. But if its buried, where is the high side disconnect? That would need to be done cold. > Is the encoder disk problem one of cam or cad? > > John Lack of the ability to preview the result, I have never been able to get usable resolution out of openscam. Using a #58 pcb drill as a mill, my speed & depth of cut per pass capability suffers, so it take about an hour and a half to make one test disk. With the smaller bit, I took the slot count up to 47 from 39, but while the quadrature is usable, its not an even duty cycle, so I need to figure out if I need narrower or wider slots, plus the center hole math needs tweaked to account for the bit radii, with the smaller bit, the hole got very sloppy so that code piece needs tweaked. Compounded by the thinner material being able to fit into the thread on the spindle tail where I am trapping it between the bearing preload adjusting nuts. The 1/16" thick brass didn't suffer from that as those threads are about 16 tpi there. Plus I noted that somehow, in the loop that cuts the slots, which because of the fragility of that size bit, is a 9 pass loop, cutting about 3.5 thou deeper per pass, but I seem not to have properly restored some starting value for the 2nd & subsequent passes, I can see in the backplot that the length of the slot changes by about a thou on each end of the slots. I've printed the code so I can study it better, but I am thinking my next change will be to make a common subroutine that takes the current angle as an argument. As is, that math is scattered in about 4 places & I've obviously an error in one of them. That, and turn the index pulse cut into an extension of the first cut when the angle is 360. Some sort of a conditional there because I now have a slightly wider index pulse than is needed. This material I'm using this time came from a dishwashers door insert, which when I looked, turned out to be two layers of 17 thou thick alu, painted both sides so you can have your choice of black, white, or almond. So I have enough to make quite a few. :) Time, as long as I'm still sucking air regularly, is something I have. Other than an occasional bout of loading the dishwasher, getting Dee whatever she wants to eat & about 6 hours a week beating back the jungle, I am not otherwise occupied. ;-) > On 5/29/2012 2:45 PM, gene heskett wrote: > > On Tuesday, May 29, 2012 03:10:01 PM John Thornton did opine: > >> Where should the 208v be? The mains are 244vac. > > > > That means your wall socket voltage is about 122. Using the same math > > in kcalc, I get 211.310198523, but the meter will be great if it > > actually displays the .3. :) > > > > The math is simple enough, sin(120)*voltage, where the 120 is the > > phase angle under ideal conditions. FWIW sin(120) and sin(60) return > > exactly the same value because the sin is mirrored around modulo 90 > > degrees where it is 1.00000, and is zero at 0 and 180 degrees. > > > > That is just about 1 step on the taps of your service pole can. The > > substation regulators can usually do finer work. That pole can, from > > the looks of this, should be able to feed your place with at least > > 25kw in order to be adequately 'stiff' enough for this level of load > > variations. I was bumping the 4 or 5 houses on my can just enough > > that my eyes could see it, so both the bigger bandsaw, and my 6" > > delta jointer (the one I trimmed my fingernails with) are now > > reconfigured for a 250 volt single phase feed. I don't even see the > > lights in the shop dim now. Its 6 gage buried range-like cable back > > to the 200 amp house service, nice and stiff. > > > > :) My AC has a 2.5 horse 127v motor on it and I need to do it the > > :same > > > > way. > > > > Got a summer thunderboomer moving thru, noisy outside, but I am > > tempted to go setup the mill and see if I can make another encoder > > disk for the lathe. I have some thinner material now, salvaged from > > the color panel in the front door of a dishwasher that failed, black > > but I'll have to magnet test it to see if its ferrous, that if > > plastic I maybe can carve with a pcb drill for a mill. And I need to > > modify that code a bit so there is no width discontinuity for the > > long slot that is the index pulse. > > > > I may have to hit up Andy up for some math help because I don't think > > that code compensates for the mill radius when it tapers smaller at > > the inside radii of the slots. I get the impression that the taper > > it uses needs a /2 in order to aim the side of the carved slot > > directly at the center of the circle. > > > >> John > >> > >> On 5/29/2012 12:11 PM, Jon Elson wrote: > >>> gene heskett wrote: > >>>> I have another wild idea, your Vab, Vac, Vbc voltages would appear > >>>> to be moderately well balanced, as they should be. The generated > >>>> C, measured to ground, is quite hot as is also expected. > >>> > >>> Perfect should be 208 V, so 212 is quite close. > >>> > >>> Jon > >>> > >>> -------------------------------------------------------------------- > >>> -- -------- Live Security Virtual Conference > >>> Exclusive live event will cover all the ways today's security and > >>> threat landscape has changed and how IT managers can respond. > >>> Discussions will include endpoint security, mobile security and the > >>> latest in malware threats. > >>> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > >>> _______________________________________________ > >>> Emc-users mailing list > >>> [email protected] > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> --------------------------------------------------------------------- > >> --- ------ Live Security Virtual Conference > >> Exclusive live event will cover all the ways today's security and > >> threat landscape has changed and how IT managers can respond. > >> Discussions will include endpoint security, mobile security and the > >> latest in malware threats. > >> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene > > ------------------------------------------------------------------------ > ------ Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. > Discussions will include endpoint security, mobile security and the > latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> No matter whether th' constitution follows th' flag or not, th' supreme court follows th' iliction returns. -- Mr. Dooley ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
