Hello all; I managed to get the power bussed around to 4 of them yesterday, but will need to run out to the shack for some of their 4 wire flat cable to hook up the inputs etc, using a cnc4pc C1G interface card. Due to the length of my motor pigtails, I believe I will move the terminal strips they originally hooked to on the outside of the 4 axis xylotex box, to the side of the newer electronics box, a chore that will take half a day by the time I drill & tap the holes and such. They are hooked up now, but the more I look at them, the bigger chances for a short circuit I see.
There are a couple concerns I'd like to discuss. 1. This PSU has a smallish 5 volt supply that is always hot when its powered. No data available as to how much power it can supply, but from the looks of the active devices I would guess at .5 amp max. I am going to see if it can supply enough 5 volts to run the cnc4pc C1G interface card. 2. Its main supply needs an enabling 5 volts to bring it up, functioning like a power switch but at logic levels. This then is asking me how to use it to control motor power so that it is enabled only when emc is running, and with 4 axis's + spindle controls, I don't even know if I have enough pins left on a single parport, so that will be relegated to a secondary todo list for now. I've been switching motor power manually for years now. 3. Is there a preferred way to set the active state when dealing with the opto inputs of these MM-542 amplifiers?. The cnc4pc C1G can be set for either polarity by means of a jumper that connects all the com terminals to either ground or 5 volts. In other words, are the opto's generally faster when the + line is the 5 volt bus, and the - line is pulled to ground, or vise versa? The cnc4pc C1G claim's to be able to source or sink 24ma per output. The unk is probably how fast the opto's are. 4. These MM-542 drive's can microstep to way more than 8 microsteps, 1/128 or even 1/256 I think. With my pc, an XP1400 athlon that will lag noticeably with a base_period under 30 microseconds so its running at about 35 ISTR, I have wondered what my max IPM might be, primarily because if I ask the drive to do more than the 1/8th I know works well, my mind says I am giving away the small speed steps, resulting in much greater speed change ratios at the higher speeds than I have now, which is pretty smooth with no obvious individual tones being played at the higher speeds when moving in large circles. Max IPM is set at 22.5" ATM for x&y, about 34 for z as its screw is 2x faster but there is a 42-17 stepdown there. Plenty fast enough to break tooling or do serious damage to clamps. Can some math be used to predict the optimum microstep ratio given these constraints? Nuff questions for one day, now I need to go get some flat 4 wire cable from the shack. Thanks guys. 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://204.111.66.235:85/gene/> The first thing we do, let's kill all the lawyers. -- Wm. Shakespeare, "Henry VI", Part IV ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
