A subroutine using a coordinate system rotate might be the simplest method. Establish the center of your disk as X and Y0 and do a G10 L2 R between slots. Something like the following partly tested code should do the trick.
Position tool at safe point #<current-r> = 0 G10 L2 P1 R#<current-r> (just to make sure in case of an abort) o100 repeat [45] Position tool at start of cut Slot cutting Position tool at safe Z G0 X0 Y0 #<current-r> = [#<current-r> + 8] G10 L2 P1 R#<current-r> o100 endrepeat M2 On 5/30/2012 6:59 AM, gene heskett wrote: > 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 >>>>> Emc-users@lists.sourceforge.net >>>>> 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 >>>> Emc-users@lists.sourceforge.net >>>> 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 >> Emc-users@lists.sourceforge.net >> 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. 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