McMaster-Carr has 4 mm square nuts in stock. On Wed, Aug 12, 2020, 8:39 PM Gene Heskett <ghesk...@shentel.net> wrote:
> 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
