On Tuesday 07 July 2015 18:21:39 Greg Bentzinger wrote: > This is directed at Gene and his grips with the back plot showing > spindle center vs. cut edge. > > I been pounding the keys for many a year since I was first trained on > the New Bandit level 1 control with a round RS-232 Amphenol mil spec > output to a good old teletype machine so proven programs could be > punched out on paper tape. > > In those years I have often found the need to creatively lie to the > control to convince it to do what I needed done. > > > Your backplot issue is a perfect example. > > Make a duplicate of your final program and in that duplicate up the > feed rates to just below rapids. Change the Z values such that the > tool will cut from say .15 to .115 above the actual material. Change > your tool radius comp value to .0002" > > > Now you could just run the backplot on this duplicate - or add it as > the first part of the final program with an M0 program stop before the > real program starts. Maybe use block deletes on all the duplicate > lines so the duplicate won't execute with block skip/delete on.
I could just dup that code, up in the air. Interesting thought. I already do an up in the air trace cut to check for fixture clearance > There may be many different ways to skin a cat - but first I'm told I > have to kill the thing 9 times. I'm working on that, or its working on me. Open for discussion. First thing is, these seimens opto's are both a bit slow, and need a hell of a lot brighter led. I figured that if, when I put my meter in the diode mode, where it shows the output will look like a diode with an approximately .8 volt barrier voltage when it is illuminated, that should be enough to drive the opto's in this BoB. Sorry, wrong answer. Stick my meter in ma mode between ground and one of those inputs. the halmeter says its True, and my meter says its sourceing a hair over 11 mills. But when I hook up the index line from the encoder, with nothing in the gap, its only sinking 2.31 mills, quite a ways from the 11 that gives me a solid true. Pulldown voltage at the BoB's input pin from 4.71 to 3.8 just doesn't cut it. And I have serious doubts that raising the led current to its rated 60 mills will solve that problem. Series R's are currently 120's. s/b about 40 mills. I'll make some measurements an make a swag as to what to parallel with the 120's to get 60 and see if it helps. The BoB has its own 1 amp supply, so there is room to play. So, take the leftover pcb, and hang it inside the head a few inches from the slot stuff and buffer it to get a rail to rail swing if full current still doesn't play well. I am getting the impression my index slot isn't long enough too. > Another thing - once you get cutting with that new mill you will find > that many of the plagues you suffered with on that X1 are no longer an > issue. Lexan and Aluminum cut like butter - but you have to CUT them, > creeping along shallow and slow only dulls the tool and tries to push > the material, not cut it. I am reminded of that every time I'm working in alu. Amazingly this .0312" mill, making brass dust, has carved 2 full disks now, and is still making dust as normal. It might even make another disk once I get decent signals out of the slot devices. > For Al a trace of plain un-died Kerosene > works like magic as a cutting fluid for Aluminum. It has to wet and seal the air away from the alu so the oxide film cannot reform between cutting edges going by. A mist of safflower oil also works well but fogs up the air in time. > For Lexan / > Polycarbonate some plain 70% isopropyl Alcohol can be used when > needed, but I usually cut that dry. > > As for your encoder disc - I would cut it in 4 passes - BUT I would > add a spot drilling and drilling cycle to pre-drill thru where the > tool does its plunge move, as that is an easy way to take away one of > the most likely breaking points. (Actually I would cut it in 3 passes, > but I would use a power mister or full flood coolant.) I considered that, but instead I drop to the previous depth cut, dead center in the slot, then ramp to the new depth as it moves to the corner of the slot before it does a climb cut all the way around the slot, 4 moves later ending up at the same spot it ramped down to before it withdraws and moves to the center of the next slot. And all this is done dry. I brush away the brass dust occasionally so I can see what it is actually doing. That may not be ideal, but it hasn't broken a mill yet unless I forgot to slow the feed rate for the real thing. 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> ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
