I've added a photo.
www.autoartisans.com/harmonicdrive/HarmonicDrive-8.jpg
The new wave generator pieces puts the bearings 1mm further out. Was also able
to bring it a bit closer to the motor so the bearings now sit in the middle of
the fixed spline gear.
I've run it with 18,000 steps per
Hi John;
I designed and built, from petg, the loose belt version based on Sam idea but
quite a bit smaller. I can drive it with a 1NM 3 phase motor which has an 8mm
d-flatted shaft after grinding the dflat quite a bit wider. No metal in the
hub, its just a press fit on the motor shaft.
On Tue, 30 Nov 2021 at 21:43, John Dammeyer wrote:
> Do you have a similar sized micrograph of the mating profile?
Sorry, no, that's a lot harder to photograph.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses,
I will post them later tonight.. To be honest - I took a video of the one
of the drive mfg and kinda measured the tooth angle. (mine are just
triangles..)
sam
On Tue, Nov 30, 2021 at 2:30 PM John Dammeyer
wrote:
> Hi Sam,
> Could you share the STEP file for the flex gear? I want to look at
So nothing as complicated as:
https://journals.sagepub.com/doi/pdf/10.1177/1687814019850656
I did detailed measurements on the cup version I printed and there are two
issues. The worst is the shrinkage of the plastic results in the bearing
holder being 1mm too small in diameter compared to the
On Tue, 30 Nov 2021 at 20:30, John Dammeyer wrote:
>
> I want to look at the tooth shape.
This is a micrograph of the flexspline of my broken HD drive.
https://photos.app.goo.gl/mmJdebQD1QY538xY6
This part of their web site makes a thing about the "S" shape of the
teeth, and has a little
This is the profile I am currently using...
http://electronicsam.com/images/greenmachine/IMG_20210127_104354.jpg
On Tue, Nov 30, 2021, 3:10 PM John Dammeyer wrote:
> So nothing as complicated as:
> https://journals.sagepub.com/doi/pdf/10.1177/1687814019850656
>
> I did detailed measurements
See below.
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: November-30-21 1:23 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Harmonic Drive
>
> On Tue, 30 Nov 2021 at 20:30, John Dammeyer wrote:
> >
> > I want to look at the tooth
Yeah the sides of your flex bearing contact the sides of the spline bearing
before it bottoms. See the post I just made for more detailed photos.
John
> -Original Message-
> From: Sam Sokolik [mailto:samco...@gmail.com]
> Sent: November-30-21 1:23 PM
> To: Enhanced Machine Controller
Here's a link to the photos.
Two views of all the parts not including the bearing arm.
www.autoartisans.com/harmonicdrive/HarmonicDrive-1.jpg
www.autoartisans.com/harmonicdrive/HarmonicDrive-2.jpg
I didn't have the larger ID bearings so I used one with OD 47 but ID 20mm and
recreated the
If I understand the theory and the various article it's more a sine wave and so
the teeth follow that. What does it mean? Not quite sure. The key comment I
did note was that is that the teeth tips move relative to the root pitch.
Think of taking a toothed belt. Laid flat the crests are
Isn't the purpose of an involute surface the minimization of sliding two
surfaces? I would think an attempt would be made in the harmonic mesh.
On Wed, Dec 1, 2021 at 12:09 AM andy pugh wrote:
> On Tue, 30 Nov 2021 at 23:07, Stuart Stevenson wrote:
>
> > Is the tooth shape an attempt to mesh
The meshing of the harmonic drive splines slide in and out... not like
involute gears that rotate though with point pressure (not sliding)
On Tue, Nov 30, 2021, 7:32 PM Stuart Stevenson wrote:
> Isn't the purpose of an involute surface the minimization of sliding two
> surfaces? I would
One of the reasons that inside out toothed belts don't work well is because of
the rounded shape of the teeth. In the case of gears both the root pitch of
the gear and the distance between teeth doesn't change as it turns.
The belt goes around the pulley and at the back ends the shape of the
Said in so many less words than I used...
> -Original Message-
> From: Sam Sokolik [mailto:samco...@gmail.com]
> Sent: November-30-21 5:38 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Harmonic Drive
>
> The meshing of the harmonic drive splines slide in and
Hi Sam,
Could you share the STEP file for the flex gear? I want to look at the tooth
shape.
Thanks
John
> -Original Message-
> From: Sam Sokolik [mailto:samco...@gmail.com]
> Sent: November-27-21 8:18 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Harmonic Drive
Gene,
I haven't tried PETG yet. I have a 'real' harmonic drive like Andy's so this
is all just for a brief detour while I wait for parts for my draw bar.
An Mechanical Engineer once told me that if I want to write for Mech. Eng.
people to keep the sentances really short with lots of white
> From: andy pugh [mailto:bodge...@gmail.com]
>
> On Tue, 30 Nov 2021 at 21:43, John Dammeyer wrote:
>
> > Do you have a similar sized micrograph of the mating profile?
>
> Sorry, no, that's a lot harder to photograph.
Maybe that's the secret part that makes them work so well? The photo
Andy,
Is the tooth shape an attempt to mesh in an involute fashion?
thanks
Stuart
On Tue, Nov 30, 2021 at 3:26 PM andy pugh wrote:
> On Tue, 30 Nov 2021 at 20:30, John Dammeyer
> wrote:
> >
> > I want to look at the tooth shape.
>
> This is a micrograph of the flexspline of my broken HD
On Tue, 30 Nov 2021 at 23:07, Stuart Stevenson wrote:
> Is the tooth shape an attempt to mesh in an involute fashion?
No, because the motion of the teeth relative to each other is very
much unlike meshing gears, and so involute is inappropriate.
--
atp
"A motorcycle is a bicycle with a
ok - I sent the stl's but it is awaiting for approval.. So here they are
again..
http://electronicsam.com/images/greenmachine/harmonic/
That creates 100:1 or 101:1 depending on which side is stationary...
On Tue, Nov 30, 2021 at 9:12 PM Sam Sokolik wrote:
> I am pretty sure this is the
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