On Wednesday 27 May 2020 20:10:44 Chris Albertson wrote: > By total coincidence, I just made both. I needed 30T, 40T, and 60T > pulleys. I tried printing them and they fail after a while. The > plastic simply will not hold the set screw then they slip on the > shaft. The big thing is if the motor gets warm it heats the plastic. > The solution has to print the pulley as the thin ring. My 30T puley > has a 20mm hole. Then use the lathe to make a 20mm OD bushing with > two set screws 90 degrees apart. I make this with steel. The > pulley-ring is press fit to the steel bushing using 5 minute epoxy. > OK, you ask "How strong can plastic teeth be?" the answer seems to be > "stronger than the rubber teeth on the belt." The part of the pulley > that needs to be strong is the hub and that is now steel. Making a > center bored cylindrical bushing is a very easy job. I made a few > and this method turned out the simplest and best. Make the ring > really thin so as to make the bushing as big as you can. > > I just returned from riding my bike for a few hours and notice my > NEMA23 mount plate is 80% finished. I'm still testing if these can > be made with plastic. I think so if about 6mm thick I'll know soon. > I have a test setup to check for flex in the plate. > > I'm working on a plan or "kit" to convert an HF mill to CNC using > way-cheap plastic parts (< $20 material cost) and minimal machine > work. I'll publish the design files after it works. I've had to > redesign/remake some parts 3 or 4 times but it comes out more simple > each iteration
I'd like to see if I could convert this 6040 into a printer, precisely so I could do something along those lines but in looking around for a printhead, it seems the drive is much lighter so smaller motors can move it faster, and never the twain shall meet. Trading a 3kg 24k spindle motor out for a printhead the might weigh 5oz is quite a change. I could buy another printer, but where I'd have to set it up has no AC. And good results seem to be quite temp dependent. So I get that stuff from fleabay, and wait, and wait, and wait. Thats frustrating too. So who makes the best printer for stuff like this, at an affordable price? > On Wed, May 27, 2020 at 2:06 PM Gene Heskett <ghesk...@shentel.net> wrote: > > On Wednesday 27 May 2020 00:51:57 Gene Heskett wrote: > > > On Tuesday 26 May 2020 19:45:10 Chris Albertson wrote: > > > > On Tue, May 26, 2020 at 3:01 PM Gene Heskett > > > > <ghesk...@shentel.net> > > > > > > wrote: > > > > > Those closed loop motors and controllers have arrived, and I > > > > > puzzled by a total lack of docs other than the u-step ratios > > > > > printed on the cover. Thats covered by dip sw1-4, but its a 6 > > > > > pos switch, and 5 & 6 are in Chinese pictograms. > > > > > > > > I'm following this because, as said, I plan on doing the same. > > > > However I always read the docs BEFORE buying, no docs, I don't > > > > buy. > > > > > > > > Post a photo of the Chinese characaters, I have someone here > > > > fluent in Chinese. Also you can try Chinese OCR and then apply > > > > Google Translate. > > > > http://www.i2ocr.com/free-online-chinese-traditional-ocr > > > > > > I found out what they do, one is a direction reverser, the other > > > makes it open loop. Suits me anyway. I'll get one of those > > > supplies and one of these on the same table and play with a > > > function generator tomorrow, claims to be good for 200 khz steps, > > > and has divisors out the yang, so it ought to be a dropin except > > > for the mounts and shaft sizes so I'll need to find some timing > > > pulleys and belts. And a nema 23 mount since that 1600 oz/in on > > > the Z now is a nema 34 mount. An see if there is room enough > > > behind the apron for one of them, its 124mm long in which case > > > I'll order another for the indexer and put both of these on the > > > Sheldon. > > > > Shot down there, its around 4mm too long to clear the bed. > > > > As it runs, the 800 or 1000 divisor seems to be the smoothest, > > either one getting to 2500+ revs, 800 stalling, 1000 dieing because > > of slow opto's at about 220 kilohertz. Either way plenty of turn the > > house around torque, so I'm suitably impressed. Now I need a 10mm > > belt pulley with 30 teeth and a motor mount for a nema 23. The > > trick is finding both on this side of the pond... > > > > Thanks All > > > > > That 8 lead nema 24 on the x is slow, stalls at > > > about 30 ipm. even when set as 4 wire parallel and all the amps a > > > 2m542 can do. Even then it runs cooler than steppers usually do. > > > The x belt tensioner is drilled for a 23 and then the holes were > > > moved enough for the 24. > > > > > > > My guess about the cable length mismatch is that the seller you > > > > bought this from gathers parts and packages them and this motor > > > > was made for a use case that did not include this controller. > > > > > > The motor and encoder look to be an integrated unit. So I'll have > > > to splice it, or pull the cover and see if its easily replaceable > > > with a smallish 18 or 20 gauge line cable. Lots of layup stuffing > > > on this one to get to a matching cable jacket size, the wire gauge > > > itself isn't impressive at all. At its peak of 4 amps a coil, that > > > cable WILL heat. Not badly, but detectable. > > > > > > > When googling for the instruction, look for related controllers > > > > as I'd bet the firmware was written to run on many different > > > > sizes of controllers, not just the one you have. Many of these > > > > are Leadshine clones so look at Leadshine web site. > > > > > > Thanks Chris, stay well. > > > > > > Cheers, Gene Heskett > > > > 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) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
