On Wednesday 12 August 2020 15:55:39 grumpy--- via Emc-users wrote: > On Wed, 12 Aug 2020, Gene Heskett wrote: > > On Wednesday 12 August 2020 12:45:14 grumpy--- via Emc-users wrote: > >> gene, how is this project come'n > >> i keep look'n for pictures on your web site > > > > That will happen eventually but progress was slow when I started out > > with a printer that was totally uncalibrated OOTB. So once I got > > that figured out, the extruder was only feeding about 13mm of > > plastic for a 100mm feed. Then it was make flexgears creeping up on > > the right size to actually fit in the main bearing, you have to make > > it at least 3 red hairs small because the printer bleeds that much. > > So about 8 of them later, I finally have 3 that fit. Then the size > > of the internal spline is too large for that sized gear, and I just > > now took the 2nd good one off the printer and may make the last one > > at another .05 less on the printers xy scales as there is still > > 15-20 thou of clearance between the teeth at maximum pullin on the > > sides of the bearing carrier. That will be added to by the fact that > > the bearing carrier is carrying 6 bearings in groups of 3. So I just > > reduced the scale to 79.85 from 79.9 as I believe there is room yet > > to tighten that up another few thou. The closer that is, the less > > actual flexing the flexgear has to do and it won't fatigue and break > > so quick. > > > > I have already made some bearing carriers, but may have stretched > > them too much before I found the flexgears were too big for the > > bearings. So that fit has not been pronounced as good yet. > > > > The idea then is to scale the bearing carrier for a teeny bit of > > overpush, flexing the houseing and circular spline a thou or 4 for a > > break-in wear clearance, keeping it backlash free a bit longer. > > > > The third one, if it has the cajones for the job, will be turning > > the worm of a chinese B&S-1 indexing head clone, not a big job but > > hard to do if its being driven under cutting loads as in making > > spiral or hypoid gears. I have another 100/1 worm drive gearbox > > with a 3NM 3 phase motor on it that will get used there if this > > plastic isn't up to that job. But I've been messing with this > > instead of makeing the shaft couplings that will take. Making 3 of > > this drive cuz the first 2 will eventually be connecting the > > stellarium program to my now elderly Meade DS-10 telescope, a 10" > > Newtonian design. That will take another rpi4 and some interfacing. > > > > Taking inventory, I still need a bag of 4mm nuts, and a smaller bag > > of 4mm square nuts for the bearing carriers. And suitable grease, > > all of which seem to be of Chinese only source, and another 6 weeks > > away. > > > > Stay well and safe Grumpy. From one grumpy, long retired old fart to > > another. > > > > Cheers, Gene Heskett > > it sounds very cool
I thought so too, but now I'm trapped. Dogone stuff is contagious :) > post a link to the thingiverse files Its already been posted to this list 3 times. > you should put up some pics of what you've got so far > a pictorial cronical of your journey > even the bad stuf is a lesson for us beginners What I intend to do is going to be more like a tut on how to take a poorly designed but decent idea to the point of actually haveing some of the advantages of the $1k dollar versions except their longer life. In particular, how to make minor adjustments that will make it work 10x longer. Thats the general idea anyhow. The long life part is obviously TBD. Waiting before too much longer on some M4 sq nuts. Ebay has exactly none. Might have to make them, and 4mm is getting a bit teeny. Take care now. 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
