On 7/4/24 10:55, Stuart Stevenson wrote:
Gene, Maybe AI will allow the development of anticipation that allows LinucCNC to control steppers in the same fashion as the integrated controller in your system. I believe we have been users of AI for many years. The early CNC machines developed the necessary electronics (AI) to enable the functionality. LinuxCNC, et al, has been developing the software equivalent (AI). maybe AI is the key - AI = artificial intelligence or AI = artificial ignorance or (I have seen several meanings for the acronym AI) and I seem to notice more every day. regards Stuart
AI seems to be a fav buzzword these days, whether they mean some variation of the AI seen above remains to be found.
The engraving of text on the side of a part is a particularly stressing exercise for a 3d printer as it must come to a virtual stop, turn a 90 degree corner, move say .7mm into the part, then resume the movement across the stem of the character, then stop again and come back to the original sidewall of the part, essentially stopping each time it turns a corner. A normal stepper will ring like the liberty bell, smearing this motion with its magnetic ringing until the text is almost destroyed by the ringing and overshoots.
The stepper/servo slaves the motor to the input steps as that ringing, lag or overshoot is seen by the encoder as an error of several counts resulting in a reversal signal to the motor to reduce that error. The controller will use every amp the psu can supply to prevent a lost step, which by the time the output filters in the psu are added as a src of current, can be 20 amps or more for the supply on a microsecond to microsecond basis even if the supply is labeled as a 90 volt, 6 amp supply.
These newer controllers are not limited to the 24 volts in a 3d printer or the 48 volts a 2m542 uses in the shop, but can be had in 90 volt versions for nema-17's, or 110 volts dc for the nema-23-24's. First intro'd about 3 or 4 years ago, the tooling is now paid for and the prices are falling off a cliff. With careful shopping, the price premium is now only about a tenner per axis. The voltage limit today seems to be the availability of psu's to drive these higher voltage controllers. My Ender 5 Plus was the first to get these new motors and the top voltage for switchers was then 62 volts. I also have a tronxy-400 I've even redesigned the belt paths on, its a corexy and wasn't square, has a 72 volt supply. I'm still waiting to buy its bed heater supply as I'll need another 30C of bed heat should I toss a roll of polycarbonate on it. A 400mm square plate is a power hog. But with good hot ends I can make big vice parts 6 or 8 up.
Good hot ends are a problem so I'm designing my own. And that is another complete chapter all by itself.
"FLYING" parts like the X transport bar are now carbon fiber tubing and linear bearings, doubling the speed with stock motors that are now collecting dust on a shelf. The bar I took off the tronxy was just 5 ounces short of 2 lbs! Solid alu with 8mm steel rods inlaid for wheel trackage. Unreal...
I've already put a 32 volt 600 watt on the Ender 5 Plus for bed heat, but that 365 sq bed needs more yet, can't get past 65C for PETG parts, so a 36 volt 1kw is waiting to be swapped in when my legs heal, which is slow since I'm a DM-II. And at some point, I'll need to invest in 100 feet of 10 ga in at least 3 colors plus a static ground to run a circuit per printer in from the 200 amp service 25 feet away in the garage.
All this of coarse keeps me out of the bars which as a long term diabetic I should skip anyway. Alcohol being instant sugar.
Take care & stay well, Stuart. Cheers, Gene Heskett, CET. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
