> From: John Dammeyer [mailto:jo...@autoartisans.com]
>
> I'm headed in the other direction since I'd like LCNC to make it. First I
> have to reprint the ring gear though. Would be much smarter
> to actually make it with 142 teeth instead of 140. I'll try a different
> filament. That will
I installed Gene's CAD program and exported as STL because FreeCAD didn't
recognize the format. Or I did something wrong. The generated STL file
wouldn't export as a STEP file in either FreeCAD nor Fusion360.
John
> -Original Message-
> From: Chris Albertson
On Mon, Dec 20, 2021 at 5:35 PM gene heskett wrote:
> On Monday, December 20, 2021 7:03:21 PM EST John Dammeyer wrote:
> > Perhaps save it as a step file or iges. I can't read that scad file.
>
> I don't think it can output those non-free formats.
>
STEP is an ISO standard and
IGES is a U.S.
FreeCAD can input OpenSCAD files and then export
step or iges files. Before I got more comfortable with
FreeCAD, I would design my part in OpenSCAD, read
the scad file into FreeCAD and then apply fillets before
exporting. Fillets have historically been a real pain in
OpenSCAD (not sure if they
On Monday, December 20, 2021 7:03:21 PM EST John Dammeyer wrote:
> Perhaps save it as a step file or iges. I can't read that scad file.
I don't think it can output those non-free formats.
OpenSCAD exports an .stl, ready for cura.. And if you go clear to the bottom
of the downloads page the
Perhaps save it as a step file or iges. I can't read that scad file.
> -Original Message-
> From: gene heskett [mailto:ghesk...@shentel.net]
> Sent: December-20-21 3:10 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Harmonic Drive
>
> On Monday, December 20, 2021
On Monday, December 20, 2021 1:49:18 PM EST Chris Albertson wrote:
> Yes, he used maybe 30 pounds of metal parts. And I only saw a few degrees
> of rotation in the video, run it for 100 hours and see what happens. Flex
> is what kills the plastic so after 100 hours it will have had a few
I got the idea to post process the gears with heat when I was experimenting
with brass inserts. They make this tool for installing inserts. One end
is turned to fit the insert the other is turned to exactly fit my
temperature control solder iron. I set the iron for 180C and the insert
is
I'm headed in the other direction since I'd like LCNC to make it. First I have
to reprint the ring gear though. Would be much smarter to actually make it
with 142 teeth instead of 140. I'll try a different filament. That will
likely also make a difference and maybe prevent the stringing.
There's not a lot of load so manually indexing a rotary table 142 times to cut
a metal ring gear is tedious but only needs to be done once. After that with
the rest in plastic you have the 4th axis.
John
> -Original Message-
> From: Matthew Herd [mailto:herd.m...@gmail.com]
> Sent:
So I imagine it is possible to post-process a thermal plastic gear, but at that
point, maybe it’d be better to set up a gear skiving machine to make the flex
rings. If you can get the cutter and angle a rotary axis with respect to the
spindle, you should be able to do it without much hassle.
Is it possible to post process a thermal plastic gear? Lets say you took
a high-precision metal gear and heated it to 180C and the rolled it over
the printed gear with the correct center to center distance. You would
need to build a test fixture to do this but might be worth it.
lately I've
On Mon, Dec 20, 2021 at 11:23 AM Andrew wrote:
>
> > Has anyone tried DLP/SLA printed flex splines?
>
Thinking more along those lines, There are printers that can print metal
parts.
They are expensive but if you only need one or two parts Shapeways can print
them for you. They offer to print
I'm going to guess that the +8C ambient temperature in the room that houses the
printer isn't really helping with the PLA stringing or maybe not able to bond
to the colder plastic previous layer. The teeth themselves look reasonable but
this will take a lot of cleanup.
And of course I have a
As an experiment, now that I've modified the AlibreCAD Python script to use
Module or Pitch Diameter and learned how to cut internal spline teeth I created
two parts with double the original harmonic drive: 140T and 142T with
0.5module teeth.
The cup ID dropped to 65mm from 80mm for the
Yes - because I cannot easily make the harmonic drive out of metal.. Hence
the 3d printed bits. I have run it for 24 hours at about 700 rpm.. The
gears still look good. You are engaging a substantial amount of teeth - I
think errors are probably pretty minimal. I could certainly throw a high
пн, 20 груд. 2021 р. о 20:26 Chris Albertson:
> Finally ANY flexing at all is the death of printed parts. They fail by the
> failure of interlayer adhesion. Think of printed plastic like it is soft
> pine wood. When making gears from yellow pine, the direction of the grain
> matters a lot and
Yes, he used maybe 30 pounds of metal parts. And I only saw a few degrees
of rotation in the video, run it for 100 hours and see what happens. Flex
is what kills the plastic so after 100 hours it will have had a few million
cycles. But still it is 99% made of metal.
I want to see a 100%
Did you watch this video til the end? I time stamped it.
https://youtu.be/eW1GGI55Epc?t=878
sam
On Mon, Dec 20, 2021 at 12:26 PM Chris Albertson
wrote:
> On Fri, Dec 17, 2021 at 6:05 PM Sam Sokolik wrote:
>
> > Hmm - seems we are making things a bit more complicated than they need to
> >
On Fri, Dec 17, 2021 at 6:05 PM Sam Sokolik wrote:
> Hmm - seems we are making things a bit more complicated than they need to
> be.. Why didn't the simple flex gear work ok? You need to make the
> system with fine enough splines that the flexure is at a minimum...You
> can lower the
Encoders have gotten very easy and cheap.
These are small enough to fit inside the drive, and only cost $9 on
Amazon. They are half this price if bought directly from China and even
less if you have custom PCBs made. This chip on a custom PCB might cost
about $2 (plus about $25 in express DHL
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