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 -- "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
