Maybe a stratified heat treat would give you a flex area. Induction heat
treat would be able to do that.
On Thu, Jan 7, 2021, 3:51 AM Roland Jollivet
wrote:
> On Thu, 7 Jan 2021 at 01:35, Gregg Eshelman via Emc-users <
> emc-users@lists.sourceforge.net> wrote:
>
> > I wonder if a replacement cup
On Thu, 7 Jan 2021 at 01:35, Gregg Eshelman via Emc-users <
emc-users@lists.sourceforge.net> wrote:
> I wonder if a replacement cup spline with an elastomeric part would work?
> Make teeth that interlock at the side of the spline wall and the back
> plate, with a thin filler of high durometer flex
You'd want the rollers to have teeth matching the interior ribbed shape of the
spline.
On Wednesday, January 6, 2021, 7:42:54 AM MST, Todd Zuercher
wrote:
I wonder if instead of machined spines, the cup could be made from a sheet
stamping with the splines simply crimped into the sheet
As someone else says. Cycloidal gears look totally diy on a cnc mill
On Thu, Jan 7, 2021, 12:35 PM Gregg Eshelman via Emc-users <
emc-users@lists.sourceforge.net> wrote:
> I wonder if a replacement cup spline with an elastomeric part would work?
> Make teeth that interlock at the side of the spl
I wonder if a replacement cup spline with an elastomeric part would work? Make
teeth that interlock at the side of the spline wall and the back plate, with a
thin filler of high durometer flexible urethane, bonded to the metal with
something like Smooth-On Ure-Bond II.
_
On Wed, 6 Jan 2021 at 19:41, Roland Jollivet wrote:
>
> I did a similar thing a while back, wanting to see if I could make a single
> stage gear-gear reducer.
I actually tried to use a design like yours in a commercial product, I
needed a really thin drive system. In my case I tried to prevent
ro
On Wed, 6 Jan 2021 at 17:22, andy pugh wrote:
> On Wed, 6 Jan 2021 at 14:52, Ralph Stirling
> wrote:
> >
> > Along those lines, could curved "teeth" like cycloidal reducers be used
> with a flex element?
>
> Here's something I designed earlier :-)
>
> https://youtu.be/VrvwlPxRhKU
>
>
I did a sim
On Wed, 6 Jan 2021 at 14:52, Ralph Stirling
wrote:
>
> Along those lines, could curved "teeth" like cycloidal reducers be used with
> a flex element?
Here's something I designed earlier :-)
https://youtu.be/VrvwlPxRhKU
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
de
: [Emc-users] I wonder if I can fix it?
I've been pondering this for a while now, wondering if there's a design shape
that has been missed.
In terms of a fresh design, things that could be done;
- increase the length of the cup
- put cutouts in strategic places
- use a cone rather than a c
AM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] I wonder if I can fix it?
I've been pondering this for a while now, wondering if there's a design shape
that has been missed.
In terms of a fresh design, things that could be done;
- increase the length of the cup
- put cutou
On Wed, 6 Jan 2021 at 14:09, Roland Jollivet wrote:
> - make the cup in more than one piece (flexspline +CV bearing)
There is a variant design used in some of the HD systems that uses two
of the outer ring gears and a double-length cylindrical flexspline.
The outer rings have different numbers o
I've been pondering this for a while now, wondering if there's a design
shape that has been missed.
In terms of a fresh design, things that could be done;
- increase the length of the cup
- put cutouts in strategic places
- use a cone rather than a cup
- make the cup in more than one piece (flexspl
On 01/05/2021 06:05 PM, John Dammeyer wrote:
Interesting.
One could do an experiment. Cut a cup the size of the gear but without the
teeth. Then mount it and run an offset skateboard wheel inside it to flex it
about the amount the gear would flex. Count revolutions and let it go. How
many
On Wed, 6 Jan 2021 at 00:30, John Dammeyer wrote:
> Are you able to CAD model the existing broken one or is it too far gone?
I think I can work it out from knowing where it belongs.
> I suspect the Hob will be the most work.
I think it might be a job for a single-lip cutter.
I would struggle
bject: Re: [Emc-users] I wonder if I can fix it?
>
> On Wed, 6 Jan 2021 at 00:07, John Dammeyer wrote:
>
> > One could do an experiment. Cut a cup the size of the gear but without the
> > teeth. Then mount it and run an offset skateboard
> wheel inside it to flex it about
On Wed, 6 Jan 2021 at 00:07, John Dammeyer wrote:
> One could do an experiment. Cut a cup the size of the gear but without the
> teeth. Then mount it and run an offset skateboard wheel inside it to flex it
> about the amount the gear would flex. Count revolutions and let it go. How
> many
that is happening work on making a hob.
John
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-05-21 3:35 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] I wonder if I can fix it?
>
> On Tue, 5 Jan 2021 at 23:05,
On Tue, 5 Jan 2021 at 23:05, wrote:
>
> https://www.makeitfrom.com/compare/SAE-AISI-4140-SCM440-G41400-Cr-Mo-Steel/SAE-AISI-P20-T51620-Low-Carbon-Mould-Steel
Possibly a little more informative:
http://harrisonspecialiststeels.co.uk/tool-steel/p20-mould-steel/
--
atp
"A motorcycle is a bicycle w
https://www.makeitfrom.com/compare/SAE-AISI-4140-SCM440-G41400-Cr-Mo-Steel/SAE-AISI-P20-T51620-Low-Carbon-Mould-Steel
-Original Message-
From: John Dammeyer
Sent: January 5, 2021 5:57 PM
To: 'Enhanced Machine Controller (EMC)'
Subject: Re: [Emc-users] I wonder if I
> > After heat treating it would probably require some grinding or polishing
> > unless you can cover it in a way that it won't oxidize.
>
> I am wondering about using something like P20.
>
>
What is P20?
John
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> desig
On Tue, 5 Jan 2021 at 22:26, John Dammeyer wrote:
> After heat treating it would probably require some grinding or polishing
> unless you can cover it in a way that it won't oxidize.
I am wondering about using something like P20.
--
atp
"A motorcycle is a bicycle with a pandemonium attachmen
> From: andy pugh [mailto:bodge...@gmail.com]
>
> On Tue, 5 Jan 2021 at 21:31, John Dammeyer wrote:
>
> > Turn the inside to a predefined diameter and press in a support hub that
> > has a center hole that will be used for support.
>
> That mirrors what I was thinking of doing, though as the p
On Tue, 5 Jan 2021 at 21:31, John Dammeyer wrote:
> Turn the inside to a predefined diameter and press in a support hub that has
> a center hole that will be used for support.
That mirrors what I was thinking of doing, though as the part is only
50mm diameter there is probably no need to fabric
Quite a lot of the drive is still in perfect shape. That flex cup part is
toast.
What you can do is try and 3D print a new flex cup but do NOT repeat the #1
mistake that almost everyone does. They try and duplicate a metal design
but use plastic. That approach is doomed to fail. A plastic par
ced Machine Controller (EMC)
> Subject: Re: [Emc-users] I wonder if I can fix it?
>
> On Tue, 5 Jan 2021 at 20:36, Rafael Skodlar wrote:
>
> > > I am seriously considering trying to make a new flexspline. I mean,
> > > how hard can it be?
> > >
> >
> &g
On Tue, 5 Jan 2021 at 20:36, Rafael Skodlar wrote:
> > I am seriously considering trying to make a new flexspline. I mean,
> > how hard can it be?
> >
>
> Based on what I know about harmonic drives, extremely hard.
Yes, I was being a little sarcastic. But if I don't expect to make a
_good_ one,
On 1/5/21 9:25 AM, andy pugh wrote:
I bought an FHA-17C actuator from eBay. It was cheaper than normal,
for parts or not working.
It clearly had the cables cut off, so I decided to gamble.
It turns out that things were worse than I hoped.
https://photos.app.goo.gl/p3SL2Bwv2b9yd5XJ9
I am seriou
-Original Message-
From: andy pugh
Sent: Tuesday, January 05, 2021 12:26 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] I wonder if I can fix it?
>I bought an FHA-17C actuator from eBay. It was cheaper than normal, for parts
>or not working.
>It clearly had t
This is easily repaired by throwing it in the nearest round bin and buying
a more robust Spinea cycloidal reducer and servo from ebay
On Tue, 05 Jan 2021 12:25:42 -0500, andy pugh wrote:
I bought an FHA-17C actuator from eBay. It was cheaper than normal,
for parts or not working.
It cle
Fascinating. I hope mine never fails. Thanks for that posting.
John
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-05-21 10:32 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] I wonder if I can fix it?
>
>
On Tue, 5 Jan 2021 at 18:15, Mark Johnsen wrote:
> back, pushed back again, and I think they finally gave up (not sure).
> Why? Because their flexspline kept breaking because of fatigue. At least,
> that's what I had heard.
I found this interesting article:
https://www.nature.com/articles/srep
On Tue, 5 Jan 2021 at 18:23, Gene Heskett wrote:
> That one I'd hazard a guess, has been over torqued,
I think it is fatigue, starting at the root of one tooth and growing
through the whole cup.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial u
On Tuesday 05 January 2021 12:25:42 andy pugh wrote:
> I bought an FHA-17C actuator from eBay. It was cheaper than normal,
> for parts or not working.
> It clearly had the cables cut off, so I decided to gamble.
>
> It turns out that things were worse than I hoped.
>
> https://photos.app.goo.gl/p3
The flexspline is the secret sauce of harmonic gearboxes. If you can make
one (that can last), you can print money because these harmonics are used
in so many robotic applications. The Harmonic Drive patents expired a few
years ago and there was one competitor (forget who??) who was coming out
wi
ton, Ohio 44618
Phone: (330)828-2105ext. 2031
-Original Message-
From: andy pugh
Sent: Tuesday, January 05, 2021 12:26 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] I wonder if I can fix it?
[EXTERNAL EMAIL] Be sure links are safe.
I bought an FHA-17C actuator from eBay.
Ouch!
> -Original Message-
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: January-05-21 9:26 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] I wonder if I can fix it?
>
> I bought an FHA-17C actuator from eBay. It was cheaper than norma
I bought an FHA-17C actuator from eBay. It was cheaper than normal,
for parts or not working.
It clearly had the cables cut off, so I decided to gamble.
It turns out that things were worse than I hoped.
https://photos.app.goo.gl/p3SL2Bwv2b9yd5XJ9
I am seriously considering trying to make a new f
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