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
post a link to the thingiverse files
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
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