On Wednesday 12 August 2020 23:30:03 Greg Bernard wrote: > McMaster-Carr has 4 mm square nuts in stock. > Thank you Greg, be shipped in the morning. Had to reset my pw, I'd changed browsers. But its done.
> 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 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
